tag:blogger.com,1999:blog-53349004474597693232024-03-13T15:45:49.384-07:00O Fantástico da FísicaAnonymoushttp://www.blogger.com/profile/17186584252567066804noreply@blogger.comBlogger13125tag:blogger.com,1999:blog-5334900447459769323.post-87728786517093240852013-01-15T06:55:00.002-08:002013-01-15T07:23:10.305-08:00POLUIÇÃO E CIÊNCIAS DA NATUREZA<br />
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(UFBA 2010) Milhares de atratores luminosos ou bastões de luz (lightsticks) são descartados na costa brasileira por navios que utilizam a técnica de pesca conhecida como espinhel — linha resistente com grande quantidade de anzóis enfileirados. Os atratores são bastões de plástico transparente que contêm um líquido oleoso colorido</div>
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cujos componentes são perigosos para muitos organismos, inclusive o do ser humano. A exposição de células em cultura a esse óleo causou alterações em proteínas e no material genético (DNA), prejudicou funções celulares e levou parte delas à morte.A curiosidade e a luta pela sobrevivência levaram pescadores e catadores de lixo a “inventar” novos usos para esse material, como formicida, óleo para bronzeamento</div>
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ou massagem e remédio para dores nas juntas, inflamações e vitiligo. Essas práticas trazem sérios riscos à saúde dos usuários, já que o líquido dos bastões, além de tóxico para as células e o DNA, pode provocar alergias e mutações. O uso do conteúdo dos atratores luminosos como bronzeador pode levar a processos</div>
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inflamatórios e a envelhecimento precoce e a desenvolvimento de câncer de pele, incluindo o temido melanoma. A exposição de células do fígado (mantidas em cultura) a um volume mínimo (0,25 microlitro) do líquido extraído de atratores luminosos usados, dissolvido em 20 mililitros do meio de cultura, levou 20% dessas células à morte após 16 horas. (BECHARA et al., 2009, p. 43-48)</div>
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<a href="http://3.bp.blogspot.com/-WURuJ549iM8/UPV0ME3gXGI/AAAAAAAAALE/uRQ9YSVowRI/s1600/Lightsticks.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="240" src="http://3.bp.blogspot.com/-WURuJ549iM8/UPV0ME3gXGI/AAAAAAAAALE/uRQ9YSVowRI/s320/Lightsticks.jpg" width="320" /></a></div>
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Os conhecimentos da Física, da Química e da Biologia associados às informações do texto<br />
permitem afirmar:<br />
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(01) A emissão de luz pelos átomos das moléculas de substâncias luminescentes está associada ao movimento de elétrons de camadas de maior energia para as de menor energia.<br />
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<b>Verdadeira:</b> De acordo com o modelo de Bohr, quando um elétron salta de uma camada de maior energia para outra de menor energia, ele emite um fóton com energia E dada por : E= h.v , onde E é a diferença de energia entre as duas camadas, h é a constante de Planck e v é a frequência da luz emitida.<br />
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<a href="http://3.bp.blogspot.com/-fR1gHvEKLw0/UPVo0y72icI/AAAAAAAAAJs/dYh6f8qcnM8/s1600/bohr-modelo.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="278" src="http://3.bp.blogspot.com/-fR1gHvEKLw0/UPVo0y72icI/AAAAAAAAAJs/dYh6f8qcnM8/s320/bohr-modelo.png" width="320" /></a></div>
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(02) Os raios de luz emitidos por atratores luminosos que se propagam perpendicularmente à superfície de separação água-ar mudam de direção.<br />
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<b>FALSO</b>: Na incidência normal ( raio de luz perpendicular a superfície de separação) não ocorre mudança de direção da luz.<br />
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<a href="http://4.bp.blogspot.com/-RCWhV8XJAPE/UPVqggIemPI/AAAAAAAAAKA/jL_k9-ywVog/s1600/refracao.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://4.bp.blogspot.com/-RCWhV8XJAPE/UPVqggIemPI/AAAAAAAAAKA/jL_k9-ywVog/s1600/refracao.jpg" /></a></div>
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(04) A interseção entre raios de luz provenientes de dois atratores luminosos ocorre mantendo as direções de propagação dos raios que se cruzam.<br />
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<b>VERDADEIRO</b>: De acordo com o princípio da independência dos raio de luz,quando ocorre cruzamento entre eles, não ocorre mudança na direção de propagação.<br />
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<a href="http://1.bp.blogspot.com/-8muvBbLdgRY/UPVq_UJQiLI/AAAAAAAAAKI/YQjNr-I7K4A/s1600/independencia+dos+raios+luminosos.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://1.bp.blogspot.com/-8muvBbLdgRY/UPVq_UJQiLI/AAAAAAAAAKI/YQjNr-I7K4A/s1600/independencia+dos+raios+luminosos.jpg" /></a></div>
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(08) O salicilato de sódio, catalisador da principal reação química que ocorre nos atratores luminosos,é um éster que promove o aumento da energia de ativação da reação.<br />
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<b>FALSA:</b> Sendo um catalizador,<u><b>diminui</b></u> a energia de ativação da reaçao,aumentando a velocidade da reação<br />
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<a href="http://4.bp.blogspot.com/-k1gkijbkqAo/UPVr8zCB8VI/AAAAAAAAAKU/4eFTzBlFPq4/s1600/n23.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="112" src="http://4.bp.blogspot.com/-k1gkijbkqAo/UPVr8zCB8VI/AAAAAAAAAKU/4eFTzBlFPq4/s640/n23.jpg" width="640" /></a></div>
<span style="text-align: justify;">Salicilato de sódio é um sal de sódio
do ácido salicílico. Pode ser preparado do fenolato de sódio e dióxido de
carbono sob alta temperatura e pressão.</span><br />
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<o:p></o:p></div>
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É usado em medicina como um
analgésico e antipirético. Salicilato de sódio também atua como uma droga
anti-inflamatória não esteróide (do inglês non-steroidal anti-inflammatory drug
NSAID), e induz apoptose em células cancerígenas e também necrose . É também um potencial
substituidor da aspirina para pessoas sensíveis a ela.<o:p></o:p></div>
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(16) O ácido ftálico, C6H4(COOH)2, substância da qual deriva o solvente viscoso dos bastões de luz, é um diácido que apresenta núcleo benzênico na estrutura molecular.<br />
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<b>VERDADEIRA: </b><span style="text-align: justify;">O ácido ftálico ou ácido
benzenodicarboxílico consiste num ácido dicarboxílico, aromático, de fórmula
química C6H4(COOH)2. Existe sob a forma de três isómeros: orto (o), meta (m) e
para (p). O ácido o-fálico, designado correntemente apenas por ácido ftálico,
obtém-se em grandes quantidades por oxidação do naftaleno com oxigénio do ar na
presença de vanádio, como catalisador, sob a forma de anidrido ftálico
(C6H4(CO)2O), que se dissolve em água e em meio ácido precipita na forma de
ácido ftálico.</span></div>
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<o:p></o:p></div>
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O ácido ftálico e o seu anidrido
utilizam-se no fabrico de corantes e de resinas sintéticas.<o:p></o:p></div>
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O ácido p-ftálico (ácido
tereftálico) utiliza-se na produção de poliésteres, quer na forma de fibras
(terylene, tergal, trevira), quer na forma de filmes (mylar).<o:p></o:p></div>
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<a href="http://4.bp.blogspot.com/-M5AEKFyyYuI/UPVs3sMGWxI/AAAAAAAAAKo/FVvhig4Ymu0/s1600/acidoftalico.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="200" src="http://4.bp.blogspot.com/-M5AEKFyyYuI/UPVs3sMGWxI/AAAAAAAAAKo/FVvhig4Ymu0/s200/acidoftalico.jpg" width="172" /></a></div>
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(32) Alterações em proteínas podem ser consequência de erros de informação genética que se evidenciam na cadeia polipeptídica, durante o processo de tradução.<br />
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<b>VERDADEIRA:</b> <span style="text-align: justify;">Em biologia, tradução é o nome
dado ao processo biológico no qual a sequência nucleotídica de uma molécula de
mRNA (RNA mensageiro)é utilizada para ordenar a síntese de uma cadeia
polipeptídica com sequência de aminoácidos que determinada uma proteína.</span></div>
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<o:p></o:p></div>
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<o:p></o:p></div>
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Neste processo, moléculas de RNA
transportador (tRNA) operam a tradução reconhecendo as seqüências nucleotídicas
do mRNA e correlacionando-as com a sequência que corresponde a determinados
aminoácidos. A molécula que fornece a informação genética a ser traduzida é o
RNA mensageiro. Este contém uma sequência de nucleotídeos que é lida, pelo RNA
transportador (que possui uma série de anticódons) de três em três bases. Cada
trinca de bases do RNA mensageiro representa um códon e está relacionada a um
aminoácido específico. A inserção de aminoácidos na cadeia polipeptídica
crescente ocorre na mesma ordem em que os seus respectivos códons aparecem na
molécula de RNA mensageiro.<o:p></o:p></div>
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Na célula a tradução é processada
em estruturas chamadas de ribossomas, que posicionam corretamente RNAs
transportadores com RNAs mensageiros e catalisam as ligações peptídicas entre
aminoácidos para a síntese de proteínas. Os ribossomos são compostos por duas
subunidades e agem de maneira a percorrer a totalidade da cadeia de RNA
mensageiro. O papel do RNA transportador nesse processo seria o de conectar os
códons do RNA mensageiro com os devidos aminoácidos espalhados pelo citoplasma.
Ao efetuar tal processo, o ribossomo fará a ligação peptídica entre os códons
trazidos pelo RNA transportador, gerando a fita protéica.<o:p></o:p></div>
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(64) Danos no DNA humano são sempre irreversíveis devido à inexistência de enzimas que promovem o reparo no segmento alterado<br />
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<b>VERDADEIRA</b>: <span style="text-align: justify;">Células não podem tolerar danos
no DNA que comprometam a integridade e a acessibilidade das informações
essenciais do Genoma (mas, células remanescem superficialmente funcionais
quando os então chamados genes não-essenciais são perdidos ou danificados.).
Dependendo do tipo de dano infligido na estrutura duplo-helicoidal de DNA, uma
variedade de estratégias de reparo tem sido envolvidos para restaurar
informações perdidas. Como modelos de restauração, as células utilizam uma fita
complementar não modificada de DNA ou do cromossoma-irmão. Sem acesso a informação
modelo, o reparo de DNA é propenso a erros (mas isso pode ser uma via padrão:
muitos danos na fita dupla nas células de mamíferos, e.g: são reparados sem
ajuda de um modelo; veja a frente).</span></div>
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<o:p></o:p></div>
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Danos ao DNA alteram a
configuração espacial da hélice e tais alterações podem ser detectadas pela
célula. Uma vez o dano seja localizado, moléculas específicas de reparo de DNA
são enviadas ao local e se ligam à região ou nas proximidades do local do dano,
incluindo outras moléculas para ligar e formar um complexo que habilita o
reparo a agir no local. Os tipos de moléculas envolvidas e o mecanismo de
reparo que é mobilizado depende:<o:p></o:p></div>
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-Do tipo de dano no DNA que está
em jogo<o:p></o:p></div>
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-Se a célula entrou no estado de
senescência<o:p></o:p></div>
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-A fase do ciclo celular que a
célula esteja<o:p></o:p></div>
Anonymoushttp://www.blogger.com/profile/17186584252567066804noreply@blogger.com0tag:blogger.com,1999:blog-5334900447459769323.post-36869208708784965072013-01-08T00:58:00.003-08:002013-01-08T01:01:23.961-08:00Hábitos alimentares,Câncer e as Ciências da Natureza<br />
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<span style="color: #444444;"><span style="font-family: verdana; font-size: x-small;"></span><span style="font-family: verdana; font-size: x-small;">Muitos componentes da alimentação têm sido associados com o processo de desenvolvimento do câncer, principalmente câncer de mama, cólon (intestino grosso) reto, próstata, esôfago e estômago.</span><span style="font-family: verdana; font-size: x-small;"><strong><span style="font-family: verdana; font-size: x-small;">Alimentação de risco</span></strong>Alguns tipos de alimentos, se consumidos regularmente durante longos períodos de tempo, parecem fornecer o tipo de ambiente que uma célula cancerosa necessita para crescer, se multiplicar e se disseminar. Esses alimentos devem ser evitados ou ingeridos com moderação. Neste grupo estão incluídos os alimentos ricos em gorduras, tais como carnes vermelhas, frituras, molhos com maionese, leite integral e derivados, bacon, presuntos, salsichas, lingüiças, mortadelas, dentre outros.<br /><br />Existem também os alimentos que contêm níveis significativos de <u>agentes cancerígenos</u>. Por exemplo, os nitritos e nitratos usados para conservar alguns tipos de alimentos, como picles, salsichas e outros embutidos e alguns tipos de enlatados, se transformam em nitrosaminas no estômago. As nitrosaminas, que têm ação carcinogênica potente, são responsáveis pelos altos índices de câncer de estômago observados em populações que consomem alimentos com estas características de forma abundante e freqüente. Já os defumados e churrascos são impregnados pelo alcatrão proveniente da fumaça do carvão, o mesmo encontrado na fumaça do cigarro e que tem ação carcinogênica conhecida.<br /><br />Os alimentos preservados em sal, como carne-de-sol, charque e peixes salgados, também estão relacionados ao desenvolvimento de câncer de estômago em regiões onde é comum o consumo desses alimentos. Antes de comprar alimentos, compare a quantidade de sódio nas tabelas nutricionais dos produtos.<br /><strong><span style="font-family: verdana; font-size: x-small;">Cuidados ao preparar os alimentos</span></strong>O tipo de preparo do alimento também influencia no risco de câncer. Tente adicionar menos sal na hora de fazer a comida, aumentando o uso de temperos como azeite, alho, cebola e salsa. A Organização Mundial da Saúde recomenda o consumo de até 5 g de sal ou 2 g de sódio por dia, ou seja, o equivalente a uma tampa de caneta cheia. Ao fritar, grelhar ou preparar carnes na brasa a temperaturas muito elevadas, podem ser criados compostos que aumentam o risco de câncer de estômago e coloretal. Por isso, métodos de cozimento que usam baixas temperaturas são escolhas mais saudáveis, como vapor, fervura, pochê, ensopado, guisado, cozido ou assado.<br /><br /><img align="left" alt="Alimentação" height="115" src="http://www.inca.gov.br/prevencao/imagens/carne.jpg" width="110" /><strong><span style="font-family: verdana; font-size: x-small;">Fibras x gordura</span></strong>Estudos demonstram que uma alimentação pobre em fibras, com altos teores de gorduras e altos níveis calóricos (hambúrguer, batata frita, bacon etc.), está relacionada a um maior risco para o desenvolvimento de câncer de cólon e de reto, possivelmente porque, sem a ingestão de fibras, o ritmo intestinal desacelera, favorecendo uma exposição mais demorada da mucosa aos agentes cancerígenos encontrados no conteúdo intestinal. Em relação a cânceres de mama e próstata, a ingestão de gordura pode alterar os níveis de hormônio no sangue, aumentando o risco da doença.<br /><br />Há vários estudos epidemiológicos que sugerem a associação de dieta rica em gordura, principalmente a saturada, com um maior risco de se desenvolver esses tipos de câncer em regiões desenvolvidas, principalmente em países do Ocidente, onde o consumo de alimentos ricos em gordura é alto. Já os cânceres de estômago e de esôfago ocorrem mais freqüentemente em alguns países do Oriente e em regiões pobres onde não há meios adequados de conservação dos alimentos (geladeira), o que torna comum o uso de picles, defumados e alimentos preservados em sal.<br /><br />Atenção especial deve ser dada aos grãos e cereais. Se armazenados em locais inadequados e úmidos, esses alimentos podem ser contaminados pelo fungo Aspergillus flavus, o qual produz a aflatoxina, substância cancerígena. Essa toxina está relacionada ao desenvolvimento de câncer de fígado.</span></span></div>
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<b>UNICAMP 2012</b></div>
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Em 2015, estima-se que o câncer será responsável por uma dezena de milhões de mortes em todo o mundo, sendo o tabagismo a principal causa evitável da doença. Além das inúmeras substâncias tóxicas e cancerígenas contidas no cigarro, a cada tragada, o fumante aspira fumaça a altas temperaturas, o que leva à morte células da boca e da garganta, aumentando ainda mais o risco de câncer.</div>
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Assumindo que a fumaça entra no corpo humano a 72°C e sai a 37°C, calcule o calor transferido ao fumante numa tragada.</div>
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RESPOSTA:</div>
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Anonymoushttp://www.blogger.com/profile/17186584252567066804noreply@blogger.com0tag:blogger.com,1999:blog-5334900447459769323.post-64398454303400857152012-10-20T06:47:00.003-07:002012-10-20T07:36:00.469-07:00Visão além do alcance.<!--[if gte mso 9]><xml>
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<span style="font-family: "Times New Roman","serif"; font-size: 9.0pt;"> A
invenção do microscópico eletrônico, que utiliza elétrons ao invés de luz,
somente foi possível devido a dualidade onda partícula de Louis de Brogrie e ao
princípio da incerteza de Heisenberg. De Broglie afirmou que é possível
associar um comprimento de onda </span><span style="font-family: Symbol; font-size: 9.0pt; mso-ascii-font-family: "Times New Roman"; mso-bidi-font-family: "Times New Roman"; mso-char-type: symbol; mso-hansi-font-family: "Times New Roman"; mso-symbol-font-family: Symbol;"><span style="mso-char-type: symbol; mso-symbol-font-family: Symbol;">l</span></span><span style="font-family: "Times New Roman","serif"; font-size: 9.0pt;"> a matéria de
modo a associá-las um caráter ondulatório. Assim, os elétrons, por apresentarem
características ondulatórias apresentaria um comportamento similar a luz.</span></div>
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<span style="font-family: "Times New Roman","serif"; font-size: 9.0pt;"><span style="mso-spacerun: yes;"> </span>No microscópio eletrônico,
um feixe de elétrons de carga elétrica total <b style="mso-bidi-font-weight: normal;">q</b> e massa total <b style="mso-bidi-font-weight: normal;">m</b> é
acelerado por um campo elétrico que produz uma diferença de potencial <b style="mso-bidi-font-weight: normal;">U </b>até que sua velocidade atinja o valor
<b style="mso-bidi-font-weight: normal;">v.</b></span></div>
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<b style="mso-bidi-font-weight: normal;"><span style="font-family: "Times New Roman","serif"; font-size: 9.0pt;"><span style="mso-spacerun: yes;"> </span>Atenda as solicitações
seguintes:</span></b></div>
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<b style="mso-bidi-font-weight: normal;"><span style="font-family: "Times New Roman","serif"; font-size: 9.0pt; mso-fareast-font-family: "Times New Roman";"><span style="mso-list: Ignore;"> a)<span style="font: 7.0pt "Times New Roman";"> </span></span></span></b><span style="font-family: "Times New Roman","serif"; font-size: 9.0pt;">Demonstre e a
expressão literal que permite determinar o comprimento de onda </span><b style="mso-bidi-font-weight: normal;"><span style="font-family: Symbol; font-size: 9.0pt; mso-ascii-font-family: "Times New Roman"; mso-bidi-font-family: "Times New Roman"; mso-char-type: symbol; mso-hansi-font-family: "Times New Roman"; mso-symbol-font-family: Symbol;"><span style="mso-char-type: symbol; mso-symbol-font-family: Symbol;">l</span></span></b><span style="font-family: "Times New Roman","serif"; font-size: 9.0pt;"> associado ao
elétron em função de <b style="mso-bidi-font-weight: normal;">h</b>,<b style="mso-bidi-font-weight: normal;">m</b>,<b style="mso-bidi-font-weight: normal;">q</b>
e <b style="mso-bidi-font-weight: normal;">U</b></span></div>
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<span style="font-family: "Times New Roman","serif"; font-size: 9.0pt;"><span style="mso-spacerun: yes;"> </span></span><span style="font-family: Symbol; font-size: 9.0pt; mso-ascii-font-family: "Times New Roman"; mso-bidi-font-family: "Times New Roman"; mso-char-type: symbol; mso-hansi-font-family: "Times New Roman"; mso-symbol-font-family: Symbol;"><span style="mso-char-type: symbol; mso-symbol-font-family: Symbol;"></span></span>λ<span style="font-family: "Times New Roman","serif"; font-size: 9.0pt;"><span style="mso-spacerun: yes;"> </span>=<span style="mso-spacerun: yes;">
</span>h<span style="mso-spacerun: yes;"> </span>/ </span><span style="font-family: Symbol; font-size: 9.0pt; mso-ascii-font-family: "Times New Roman"; mso-bidi-font-family: "Times New Roman"; mso-char-type: symbol; mso-hansi-font-family: "Times New Roman"; mso-symbol-font-family: Symbol;"><span style="mso-char-type: symbol; mso-symbol-font-family: Symbol;">(raiz)</span></span><span style="font-family: "Times New Roman","serif"; font-size: 9.0pt;">2.q.U.m</span></div>
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<b style="mso-bidi-font-weight: normal;"><span style="font-family: "Times New Roman","serif"; font-size: 9.0pt; mso-fareast-font-family: "Times New Roman";"><span style="mso-list: Ignore;">b b) <span style="font: 7.0pt "Times New Roman";"></span></span></span></b><span style="font-family: "Times New Roman","serif"; font-size: 9.0pt;"><span style="mso-spacerun: yes;"></span>Considerando os valores numéricos aproximados
h = 7.10<sup>-35</sup> J.s , q = 10<sup>-19</sup> C , m = 10<sup>-32 </sup>kg e
U = 10<sup>5 </sup>V determine o comprimento de onda dos elétrons e explique em
qual faixa das radiações eletromagnéticas mostradas abaixo o elétron se
encontra. Considere </span><span style="font-family: Symbol; font-size: 9.0pt; mso-ascii-font-family: "Times New Roman"; mso-bidi-font-family: "Times New Roman"; mso-char-type: symbol; mso-hansi-font-family: "Times New Roman"; mso-symbol-font-family: Symbol;"><span style="mso-char-type: symbol; mso-symbol-font-family: Symbol;">raiz(</span></span><span style="font-family: "Times New Roman","serif"; font-size: 9.0pt;">2) = 1,4 e compare quantas vezes o seu aumento é superior ao microscópico óptico</span></div>
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<b style="mso-bidi-font-weight: normal;"><span style="font-family: "Times New Roman","serif"; font-size: 9.0pt; mso-fareast-font-family: "Times New Roman";"><span style="mso-list: Ignore;">a </span></span></b><br />
<b><span style="font-family: "Times New Roman","serif"; font-size: 9pt;"> c)<span style="font: 7.0pt "Times New Roman";"> </span></span></b><span style="font-family: "Times New Roman","serif"; font-size: 9.0pt;">Nas lentes utilizadas pelo microscópico
eletrônico são utilizadas bobinas por onde circulam correntes elétricas de modo
a proporcionar desvio no feixe de elétrons lançados. Explique com base no
eletromagnetismo como é possível ocorrer esse desvio do feixe de elétrons.</span></div>
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<span style="font-family: "Times New Roman","serif"; font-size: 9pt;"> Solução:</span></div>
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<span style="font-family: "Times New Roman","serif"; font-size: 9pt;">a a) O trabalho w para acelerar o feixe de elétrons é dado por: w = q. U</span></div>
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<span style="font-family: "Times New Roman","serif"; font-size: 9pt;"> Pelo Teorema da Energia cinética W = Ec : q.U = m.v</span><i><b>² : v = raiz (2.q.U/m) (1)</b></i></div>
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<i><b> <span style="font-size: x-small;">Substituindo na equação </span></b></i>λ<span style="font-family: "Times New Roman","serif"; font-size: 9.0pt;"><span style="mso-spacerun: yes;"> </span>=<span style="mso-spacerun: yes;">
</span>h<span style="mso-spacerun: yes;"> </span>/</span><span style="font-family: "Times New Roman","serif"; font-size: 9.0pt;">m.v teremos: </span>λ<span style="font-family: "Times New Roman","serif"; font-size: 9.0pt;"><span style="mso-spacerun: yes;"> </span>=<span style="mso-spacerun: yes;">
</span>h<span style="mso-spacerun: yes;"> </span>/ </span><span style="font-family: Symbol; font-size: 9.0pt; mso-ascii-font-family: "Times New Roman"; mso-bidi-font-family: "Times New Roman"; mso-char-type: symbol; mso-hansi-font-family: "Times New Roman"; mso-symbol-font-family: Symbol;"><span style="mso-char-type: symbol; mso-symbol-font-family: Symbol;">(raiz)</span></span><span style="font-family: "Times New Roman","serif"; font-size: 9pt;">2.q.U.m</span><br />
<br />
<span style="font-family: "Times New Roman","serif"; font-size: 9pt;"> b) Substituindo os valores e lembrando que 7/(raiz(2) = 7 / 1,4 = 5, teremos : </span><span style="font-family: "Times New Roman","serif"; font-size: 9.0pt;"> </span>λ = 5.10<sup>−12</sup><i><b> ( da tabela corresponde a interface entre raio x e raio gama) comprovando assim o caráter ondulatório do elétron) Sendo o comprimento de onda da luz na faixa de </b></i>10<sup>−7</sup> concluimos que o microscópico eletrônico, em relação ao óptico tem uma resolução na ordem de 20000 vezes maior que o óptico (10<sup>−7 </sup>/ 5.10<sup>−12 </sup>)= </div>
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( 0,2. 10<sup>5</sup> = 2. 10<sup>4</sup> ) embora, na prática, se constata na ordem de 1000 vezes<sup></sup><br />
<br />
<sup> c) Quando uma corrente elétrica percorre uma bobina ( fios de ferros enrolados) surge um campo magnético de acordo com a lei de Biot-Savart. Quando o feixe de elétrons penetra no interior deste campo fica sujeito a força magnética de Lorentz F= B.q.v.sen x, a qual, pela regra da mão direita provocará um desvio neste feixe de elétrons, direcionando-os para o objeto a ser analisado</sup></div>
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<sup> </sup><span style="font-family: "Times New Roman","serif"; font-size: 9pt;"> </span></div>
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Anonymoushttp://www.blogger.com/profile/17186584252567066804noreply@blogger.com0tag:blogger.com,1999:blog-5334900447459769323.post-17680080236063837452012-10-19T12:13:00.002-07:002012-10-20T04:14:43.762-07:00A dupla personalidade dos elétrons.<div class="separator" style="clear: both; text-align: center;">
<iframe allowfullscreen='allowfullscreen' webkitallowfullscreen='webkitallowfullscreen' mozallowfullscreen='mozallowfullscreen' width='320' height='266' src='https://www.youtube.com/embed/lQmh7Bd33zM?feature=player_embedded' frameborder='0'></iframe></div>
<br />
<h2 style="text-align: justify;">
<span style="font-size: small;"> </span><span style="font-family: Arial,Helvetica,sans-serif; font-size: small; font-weight: normal;"><span style="font-family: Arial,Helvetica,sans-serif;">No Filme Mr. Jones,</span><i><span class="caption">Richard Gere é um maníaco depressivo</span><span class="caption">
de 40 anos que alterna fases de feliz euforia e de triste depressão.
Acostumado a esse ritmo, ele recusa se tratar. Mas, numa dessas
euforias, Mr. Jones acaba internado em um hospital psiquiátric</span><span class="caption">o. É lá que ele conhece a Dra. Libbie Bo</span><span class="caption">wen (Lena Olin).</span></i></span><span style="font-size: small; font-weight: normal;"><span class="st"> uma psiquiatra inteligente, dedicada e respeitada, <i>que já de início percebe que o diagnóstico dele estava incorreto</i>,</span></span></h2>
<h2 style="text-align: justify;">
<span style="font-family: Arial,Helvetica,sans-serif; font-size: small; font-weight: normal;"><i><span class="caption"> Na Física existe uma pergunta que se prolongou por muitos anos. Inicialmente,com Issac Newtom (século XVII) se pensava que a luz era partícula, posteriormente , o experimento da dupla fenda de Thomas Young ( Início do século XIX) mostrara que a luz era onda , pois sofria difração e interferência ( fenômenos puramente ondulatórios).Porém, em 1905, o efeito fotoelétrico descoberto por Albert Einstein mostrara que a luz era partícula, pois transferira energia para o elétron que se encontra em uma placa metálica. O impasse somente fora resolvido em 1924 com Louis Victor de Broglie que estabeleceu que pode-se associar a qualquer partícula um comprimento de onda e, da mesma forma, pode-se associar características de partícula as radiações eletromagnéticas, incluindo-se a luz (fótons) , ou seja, a matéria ou radiação pode se comporta respectivamente como onda ou partícula . </span></i></span></h2>
<div style="text-align: justify;">
<i> <span style="font-size: small;">Em 1928, Niels Bohr enunciou o <b>princípio da complementaridade</b> foi enunciado por <a href="http://pt.wikipedia.org/wiki/Niels_Bohr" title="Niels Bohr">Niels Bohr</a> onde afirma que a natureza da matéria e energia é dual e os
aspectos ondulatório e corpuscular não são contraditórios, mas
complementares. Daí vem o nome do princípio.</span></i></div>
<div style="text-align: justify;">
</div>
<div style="text-align: justify;">
<span style="font-size: small;"><i> Isto significa que a natureza corpuscular e ondulatória são ambas detectáveis separadamente e surgem de acordo com o tipo de experiência. Assim, na <a href="http://pt.wikipedia.org/wiki/Experi%C3%AAncia_da_dupla_fenda" title="Experiência da dupla fenda">experiência da dupla fenda</a> a natureza evidenciada da luz é ondulatória, ao passo que no experimento do <a class="mw-redirect" href="http://pt.wikipedia.org/wiki/Efeito_fotoel%C3%A9ctrico" title="Efeito fotoeléctrico">efeito fotoelétrico</a>, a natureza que ressalta é a corpuscular, como demonstrou <a href="http://pt.wikipedia.org/wiki/Albert_Einstein" title="Albert Einstein">Einstein</a>.
Argumentos similares valem também para a matéria. Assim, o princípio da
complementaridade atesta a ambigüidade e natureza dual da matéria e
energia.</i></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://1.bp.blogspot.com/-qZ66KznhoO8/UIGk8lBBCNI/AAAAAAAAAFw/uLtl1SbmlOE/s1600/figura.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="217" src="http://1.bp.blogspot.com/-qZ66KznhoO8/UIGk8lBBCNI/AAAAAAAAAFw/uLtl1SbmlOE/s400/figura.jpg" width="400" /></a></div>
<div class="separator" style="clear: both; text-align: center;">
<iframe allowfullscreen='allowfullscreen' webkitallowfullscreen='webkitallowfullscreen' mozallowfullscreen='mozallowfullscreen' width='320' height='266' src='https://www.youtube.com/embed/lytd7B0WRM8?feature=player_embedded' frameborder='0'></iframe></div>
<br />
<div style="text-align: justify;">
<span style="font-size: small;"><i> Perceba que é necessário entender a euforia ( característica de partícula) ou a depressão (característica de onda) para que se possa entender o elétron ou o fóton. A doutora Libbie Bowen entendera bem isso.</i></span><br />
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(kp 2013)<span style="mso-spacerun: yes;"> </span>O modelo de
Bohr- Sommerfeld estabeleceu que as órbitas dos elétrons podem se "
encaixar" perfeitamente na configuração das ondas estacionárias em uma
corda ( ver figura) . </div>
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<a href="http://1.bp.blogspot.com/-gCaIdTrDt3k/UIGtt6CNKyI/AAAAAAAAAGQ/zqS_7IOqXGM/s1600/ondas+2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="http://1.bp.blogspot.com/-gCaIdTrDt3k/UIGtt6CNKyI/AAAAAAAAAGQ/zqS_7IOqXGM/s400/ondas+2.jpg" width="400" /></a></div>
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<span style="mso-spacerun: yes;">
</span>Sabe-se que a energia dos elétrons no modelo atômico de Bohr somente
pode assumir valores de energia dados por:<span style="mso-spacerun: yes;">
</span>En = - 13,6/<span style="mso-spacerun: yes;"> </span>n2<span style="mso-spacerun: yes;"> </span></div>
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<br /></div>
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<span style="mso-spacerun: yes;"> </span>A
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as ondas estacionárias em uma corda é dada por</div>
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f = n.v/ 2.L ; onde v é a velocidade da onda na corda e L é
o comprimento da corda.</div>
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<br /></div>
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<span style="mso-spacerun: yes;">
</span>Nas duas expressões acima n é um número inteiro ( 1,2,3,...)</div>
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<span style="mso-spacerun: yes;"> </span></div>
<div class="MsoNormal">
<span style="mso-spacerun: yes;"> </span>Com base
nas equações apresentadas, explique porque é possível associar características
de ondas aos elétrons no modelo de Bohr</div>
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Respostas:<span style="mso-spacerun: yes;"> </span>A
associação somente é possível pela quantização existente nas duas expressões,
ou seja, da mesma forma que os elétrons somente podiam assumir alguns valores
de energia, as ondas estacionárias somente podem assumir algumns valores de
frequência na corda o que está de acordo com a dualidade onda -partícula de De
Broglie.</div>
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<h2 style="font-family: Arial,Helvetica,sans-serif;">
<span style="font-size: small;"><i> </i></span></h2>
Anonymoushttp://www.blogger.com/profile/17186584252567066804noreply@blogger.com0tag:blogger.com,1999:blog-5334900447459769323.post-88971298659442704382012-10-09T02:30:00.001-07:002012-10-10T02:38:20.307-07:00Proteína dos músculos e as Leis de Newtom<!--[if gte mso 9]><xml>
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<span style="font-size: 10.0pt; mso-fareast-language: ZH-CN;">(Ufg 2010)<span style="mso-spacerun: yes;">
</span></span><span style="font-size: 10.0pt; mso-fareast-language: PT-BR;">A força
muscular origina-se nas fibras musculares, conforme figura (a), como resultado
das interações entre certas proteínas que experimentam mudanças de configuração
e proporcionam a contração rápida e voluntária do músculo.</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="font-size: 10.0pt; mso-fareast-language: PT-BR;">A força máxima que um músculo pode exercer
depende da sua área da seção reta e vale cerca de 30 N/cm<sup>2</sup>.
Considere um operário que movimenta com uma velocidade constante uma caixa de
120 kg sobre uma superfície rugosa, de coeficiente de atrito 0,8, usando os
dois braços, conforme ilustrado na figura (b).</span></div>
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<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-JlB43z46Dwc/UHPuNc8uz_I/AAAAAAAAAFg/FU5Yv7ObEeA/s1600/image034.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="127" src="http://4.bp.blogspot.com/-JlB43z46Dwc/UHPuNc8uz_I/AAAAAAAAAFg/FU5Yv7ObEeA/s400/image034.jpg" width="400" /></a></div>
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<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; mso-pagination: none; text-autospace: none;">
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<span style="font-size: 10.0pt; mso-fareast-language: PT-BR;">Dessa forma, a menor seção reta dos músculos
de um dos braços do operário, em cm<sup>2</sup>, e uma das proteínas
responsáveis pela contração das miofibrilas são:</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<b><span style="font-size: 10.0pt; mso-fareast-language: PT-BR;">Dados: </span></b><i><span style="font-size: 10.0pt; mso-fareast-language: PT-BR;">g </span></i><span style="font-size: 10.0pt; mso-fareast-font-family: OpenSymbol; mso-fareast-language: PT-BR;">=</span><span style="font-size: 10.0pt; mso-fareast-language: PT-BR;">1 0,0
m/s<sup>2</sup> </span><span style="mso-fareast-language: PT-BR;"></span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 11.35pt; margin-right: 0cm; margin-top: 0cm; text-indent: -11.35pt;">
<span style="font-size: large;"><b>a) 16 e actina. </b></span><span style="font-size: 10.0pt; mso-bidi-font-family: "Times New Roman"; mso-fareast-language: ZH-CN;"><span style="mso-spacerun: yes;"> </span></span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 11.35pt; margin-right: 0cm; margin-top: 0cm; text-indent: -11.35pt;">
<span style="font-size: 10.0pt; mso-fareast-language: ZH-CN;">b) </span><span style="font-size: 10.0pt; mso-fareast-language: PT-BR;">16 e mielina. </span><span style="font-size: 10.0pt; mso-fareast-language: ZH-CN;"><span style="mso-spacerun: yes;"> </span></span><span style="font-size: 10.0pt; mso-bidi-font-family: "Times New Roman"; mso-fareast-language: ZH-CN;"><span style="mso-spacerun: yes;"> </span></span><span style="font-size: 12.0pt; mso-bidi-font-family: "Times New Roman"; mso-fareast-language: ZH-CN;"></span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 11.35pt; margin-right: 0cm; margin-top: 0cm; text-indent: -11.35pt;">
<span style="font-size: 10.0pt; mso-fareast-language: ZH-CN;">c) </span><span style="font-size: 10.0pt; mso-fareast-language: PT-BR;">20 e miosina. </span><span style="font-size: 10.0pt; mso-fareast-language: ZH-CN;"><span style="mso-spacerun: yes;"> </span></span><span style="font-size: 10.0pt; mso-bidi-font-family: "Times New Roman"; mso-fareast-language: ZH-CN;"><span style="mso-spacerun: yes;"> </span></span><span style="font-size: 12.0pt; mso-bidi-font-family: "Times New Roman"; mso-fareast-language: ZH-CN;"></span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 11.35pt; margin-right: 0cm; margin-top: 0cm; text-indent: -11.35pt;">
<span style="font-size: 10.0pt; mso-fareast-language: ZH-CN;">d) </span><span style="font-size: 10.0pt; mso-fareast-language: PT-BR;">32 e actina. </span><span style="font-size: 10.0pt; mso-fareast-language: ZH-CN;"><span style="mso-spacerun: yes;"> </span></span><span style="font-size: 10.0pt; mso-bidi-font-family: "Times New Roman"; mso-fareast-language: ZH-CN;"><span style="mso-spacerun: yes;"> </span></span><span style="font-size: 12.0pt; mso-bidi-font-family: "Times New Roman"; mso-fareast-language: ZH-CN;"></span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 11.35pt; margin-right: 0cm; margin-top: 0cm; text-indent: -11.35pt;">
<span style="font-size: 10.0pt; mso-fareast-language: ZH-CN;">e) </span><span style="font-size: 10.0pt; mso-fareast-language: PT-BR;">32 e miosina. </span><span style="font-size: 10.0pt; mso-fareast-language: ZH-CN;"><span style="mso-spacerun: yes;"> </span></span><br />
<span style="font-size: 10pt;">Resposta correta: lETRA a </span><br />
<br />
<span style="font-size: 10pt;">Solução:</span><br />
<span style="font-size: small;"> <b>i) Cálculo da força resultante aplicada sobre a caixa:</b></span><br />
<span style="font-size: small;"><b> Como a caixa se movimenta com velocidade constante, concluímos que a força resultante sobre a caixa é nula de acordo com a primeira lei de Newtom. Assim, teremos:</b></span><br />
<span style="font-size: small;"><b> FR = Fat Fr = </b><b><strong>µ.N </strong></b></span><br />
<span style="font-size: small;"><b><strong> Na direção vertical: N = P </strong></b></span><br />
<span style="font-size: small;"><b><strong> </strong> Fr = <strong>µ.P </strong>Fr = <strong>µ.m.g</strong><strong> </strong><strong>Fr = 0,8.120.10 Fr= 960 N </strong></b></span><br />
<br />
<span style="font-size: small;"><b><strong style="font-weight: normal;">ii) </strong><strong></strong></b><b><strong> Cálculo da área da seção reta dos músculos:</strong></b></span><br />
<span style="font-size: small;"><b><strong>Como a força é exercida pelos dois braços, concluimos que a força em cada braço será então:</strong></b></span><br />
<span style="font-size: small;"><b><strong> Fb = 480 N</strong></b></span><br />
<span style="font-size: small;"><b><strong>Sendo uma força de 30 N para cada 1 cm2, teremos uma área A de:</strong></b></span><br />
<span style="font-size: small;"><b><strong>A = 480 N/ 30 N A = 16 cm2</strong></b></span><br />
<span style="font-size: small;"><b><strong><br /></strong></b></span>
<span style="font-size: small;"><b><strong>iii)Determinação da proteína responsável pela contração muscular.</strong></b></span><br />
<b><strong></strong></b><br />
<h2>
Contração Muscular</h2>
O estímulo para a contração é geralmente um impulso nervoso que se
propaga pela membrana das fibras musculares, atingindo o retículo
sarcoplasmático (um conjunto de bolsas membranosas citoplasmáticas onde
há cálcio armazenado), que libera íons de cálcio no citoplasma. Ao
entrar em contato com as miofibrilas, o cálcio desbloqueia os sítios de
ligação de<b><u><span style="font-size: large;"> actina,</span></u></b> permitindo que se ligue a miosina, iniciando a
contração muscular.<br />
Assim que cessa o estímulo, o cálcio é rebombeado para o interior do retículo sarcoplasmático e cessa a contração muscular.<br />
A energia para contração muscular é suprida por moléculas de ATP
(produzidas durante a respiração celular). O ATP atua na ligação de
miosina à <u><span style="font-size: large;">actina</span></u>, o que resulta na contração muscular. Mas a principal
reserva de energia nas células musculares é a fosfocreatina, onde grupos
de fosfatos, ricos em energia, são transferidos da fosfocreatina para o
ADP, que se transforma em ATP. Quando o trabalho muscular é intenso, as
células musculares repõem seus estoques de ATP e de fosfocreatina,
intensificando a respiração celular, utilizando o glicogênio como
combustível.<br />
<div style="background-color: white; border: medium none; color: black; overflow: hidden; text-align: left; text-decoration: none;">
<br /> Mais em: <a href="http://www.webciencia.com/11_28musculos.htm#ixzz28t4i5WsV" style="color: #003399;">http://www.webciencia.com/11_28musculos.htm#ixzz28t4i5WsV</a></div>
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<br /></div>
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<strong> </strong><span style="font-size: 10.0pt; mso-bidi-font-family: "Times New Roman"; mso-fareast-language: ZH-CN;"><span style="mso-spacerun: yes;"> </span></span></div>
Anonymoushttp://www.blogger.com/profile/17186584252567066804noreply@blogger.com0tag:blogger.com,1999:blog-5334900447459769323.post-28197152060789515912012-10-06T12:07:00.001-07:002012-10-06T12:07:12.457-07:00A fotossíntese e os fótons.<!--[if gte mso 9]><xml>
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<span style="font-size: 9.0pt; line-height: 105%; mso-fareast-language: ZH-CN;">(Ita 2010-adaptada)<span style="mso-spacerun: yes;"> </span></span><span style="font-size: small;"><span style="line-height: 105%;">No processo
de fotossíntese, as moléculas de clorofila do tipo “<i>a</i>” nas plantas verdes apresentam um pico de absorção da radiação
eletromagnética no comprimento de onda λ = 680 nm= 6,80 × 10<sup>–7</sup> m</span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-Fs5pY3SDRgo/UHB7by8RnlI/AAAAAAAAAFQ/DcGgTJczkwY/s1600/fotossintese.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="183" src="http://3.bp.blogspot.com/-Fs5pY3SDRgo/UHB7by8RnlI/AAAAAAAAAFQ/DcGgTJczkwY/s320/fotossintese.jpg" width="320" /></a></div>
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<br /></div>
<div class="MsoNormal" style="line-height: 105%; margin-bottom: 2pt; text-align: justify;">
<br /></div>
<div class="MsoNormal" style="line-height: 105%; margin-bottom: 2pt; text-align: justify;">
<br /></div>
<div class="MsoNormal" style="line-height: 105%; margin-bottom: 2.0pt; mso-layout-grid-align: none; text-align: justify; text-autospace: none;">
<span style="font-size: 9.0pt; line-height: 105%; mso-fareast-language: PT-BR;"><span style="mso-spacerun: yes;"> </span><span style="font-size: small;">Considere que a formação de glicose (C<sub>6</sub>H<sub>12</sub>O<sub>6</sub>)
por este processo de fotossíntese é descrita, de forma simplificada, pela
reação:</span></span></div>
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<span style="font-size: small;"><span style="line-height: 105%;">6CO<sub>2</sub> + 6H<sub>2</sub>O
→ C<sub>6</sub>H<sub>12</sub>O<sub>6</sub> + 6O<sub>2 . </sub></span></span></div>
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<span style="font-size: small;"><span style="line-height: 105%;"> Sabendo-se que a energia total necessária
para que uma molécula de CO<sub>2</sub> reaja é de 2,34 × 10<sup>–18</sup>J,.
Determine o número de fótons que deve ser absorvido para formar 1 molécula
de glicose é </span></span></div>
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<span style="font-size: small;"><span style="line-height: 105%;">DADOS:</span></span></div>
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<span style="font-size: small;"><span style="line-height: 105%;">1)<span style="-moz-font-feature-settings: normal; -moz-font-language-override: normal; font-family: "Times New Roman"; font-size-adjust: none; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal;"> </span></span><span style="line-height: 105%;">A equação
fundamental da ondulatória é c = </span><span style="font-family: Symbol; line-height: 105%;">l</span><span style="line-height: 105%;">.f ; onde c é a velocidade da luz
no ar= 3.10<sup>8</sup> m/s </span></span></div>
<div class="MsoNormal" style="line-height: 105%; margin: 0cm 0cm 2pt 36pt; text-align: justify; text-indent: -18pt;">
<span style="font-size: small;"><span style="line-height: 105%;">2)<span style="-moz-font-feature-settings: normal; -moz-font-language-override: normal; font-family: "Times New Roman"; font-size-adjust: none; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal;"> </span></span><span style="line-height: 105%;">A energia E
transportada por um fóton é dada por: E = h. f ; onde h é a constante de Planck
= 6,6.10<sup>-34</sup> J.s</span></span></div>
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<br /></div>
<div class="MsoNormal" style="line-height: 105%; margin: 0cm 0cm 2pt 36pt; text-align: justify; text-indent: -18pt;">
<span style="font-size: small;"><span style="line-height: 105%;"><sup>Solução:</sup></span></span></div>
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<span style="font-size: small;"><span style="line-height: 105%;"><sup>i) Cálculo da energia fornecida para a produção de 1 molécula de glicose </sup></span></span><span style="font-size: small;"><span style="line-height: 105%;">C<sub>6</sub>H<sub>12</sub>O<sub>6 </sub></span></span></div>
<div class="MsoNormal" style="line-height: 105%; margin: 0cm 0cm 2pt 36pt; text-align: justify; text-indent: -18pt;">
<span style="font-size: small;"><span style="line-height: 105%;"><sub> Como 6 moléculas de </sub></span></span><span style="font-size: small;"><span style="line-height: 105%;">CO<sub>2 produzem 1 mlécua de glicose, concluímos que formar 1 molécula de glicose é necessário uma energia <span style="font-size: large;">Eg = 6.</span> </sub></span></span><span style="font-size: small;"><span style="line-height: 105%;">2,34 × 10<sup>–18</sup>J,. = 14,04.</span></span><span style="font-size: small;"><span style="line-height: 105%;">10<sup>–18</sup>J</span></span></div>
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<br /></div>
<div class="MsoNormal" style="line-height: 105%; margin: 0cm 0cm 2pt 36pt; text-align: justify; text-indent: -18pt;">
<span style="font-size: small;"><span style="line-height: 105%;">ii) Cálculo da frequência da luz incidente</span></span></div>
<div class="MsoNormal" style="line-height: 105%; margin: 0cm 0cm 2pt 36pt; text-align: justify; text-indent: -18pt;">
<span style="font-size: small;"><span style="line-height: 105%;">Sabemos que c = </span></span>λ.f <span style="font-size: small;"><span style="line-height: 105%;">f = c/</span></span>λ f = <span style="font-size: small;"><span style="line-height: 105%;"><u>3.10</u><sup>8 </sup></span></span> f <span style="font-size: small;"><span style="line-height: 105%;"><sup> </sup></span></span> =<span style="font-size: small;"><span style="line-height: 105%;"><sup> </sup></span></span><span style="line-height: 105%;">4,4 × 10<sup>14 </sup></span>Hz <span style="line-height: 105%;"><sup> </sup></span><span style="font-size: small;"><span style="line-height: 105%;"><sup> </sup></span></span><span style="line-height: 105%;"></span><span style="font-size: small;"><span style="line-height: 105%;"><sup> </sup></span></span></div>
<div class="MsoNormal" style="line-height: 105%; margin: 0cm 0cm 2pt 36pt; text-align: justify; text-indent: -18pt;">
<span style="font-size: small;"><span style="line-height: 105%;">6,80 × 10<sup>–7</sup> </span></span> </div>
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iii) Cálculo da energia relativa a 1 fóton</div>
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<br /></div>
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E = h. f E = <span style="font-size: small;"><span style="line-height: 105%;">6,6.10<sup>-34</sup>. </span></span> 4,4 × 10<sup>14 </sup> = 2,9. 10<sup>-20 </sup>J </div>
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<br /></div>
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iv) Cálculo do número de de fótons:</div>
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N = <u><span style="font-size: small;"><span style="line-height: 105%;">14,04.</span></span><span style="font-size: small;"><span style="line-height: 105%;">10<sup>–18</sup></span></span> </u><br />
2,9. 10-20<br />
<br />
N = 48 fótons<br />
<br />
<br /> </div>
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<span style="font-size: small;"><span style="line-height: 105%;"><sub> </sub> </span></span></div>
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<span style="font-size: 9pt; line-height: 105%;"><span style="font-size: small;"><sup> </sup></span> </span></div>
Anonymoushttp://www.blogger.com/profile/17186584252567066804noreply@blogger.com0tag:blogger.com,1999:blog-5334900447459769323.post-88129005916886036482012-10-04T04:17:00.001-07:002012-10-04T04:49:14.864-07:00O campo elétrico dos neurônios<!--[if !mso]>
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<span style="font-size: 9.0pt; mso-fareast-language: ZH-CN;">1<b style="mso-bidi-font-weight: normal;">.</b> (Fuvest 2012- Unicamp 2012
-adaptada)<span style="mso-spacerun: yes;"> <span style="background-color: #f3f3f3; color: black;"> </span></span></span><span style="background-color: #f3f3f3; color: black; font-size: 9pt;">Em 1963, Hodgkin
e Huxley receberam o prêmio Nobel de Fisiologia por suas descobertas sobre a
geração de potenciais elétricos em neurônios. Membranas celulares separam o
meio intracelular do meio externo à célula, sendo polarizadas em decorrência do
fluxo de íons. O acúmulo de cargas opostas nas superfícies interna e externa
faz com que a membrana possa ser tratada, de forma aproximada, como um
capacitor de placas paralelas com distância entre as placas igual à espessura
da membrana, d = 8 nm (8.10-9 m) e diferença de potencial U = 64 mv (64.10-3
V).</span></div>
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<span style="font-size: 9.0pt; mso-fareast-language: PT-BR;"><span style="color: black;"> </span><span style="color: black;">A figura ilustra o comportamento do
potencial elétrico </span><i style="color: black;">V </i><span style="color: black;">em diferentes pontos no interior de uma célula, na
membrana celular e no líquido extracelular. O gráfico desse potencial sugere
que a membrana da célula pode ser tratada como um capacitor de placas paralelas
com distância entre as placas igual à espessura da membrana, </span><i style="color: black;">d </i><span style="color: black;">= 8 nm
(8.10</span><sup style="color: black;">-9</sup><span style="color: black;"> m) e diferença de potencial U = 64 mv (64.10</span><sup style="color: black;">-3</sup> V). </span></div>
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<br /></div>
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<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-VONQWBoM_Gw/UG1ukuy5CpI/AAAAAAAAAE8/gAa4RC5bnts/s1600/CELULA3.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="http://2.bp.blogspot.com/-VONQWBoM_Gw/UG1ukuy5CpI/AAAAAAAAAE8/gAa4RC5bnts/s320/CELULA3.png" width="318" /></a></div>
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<span style="font-size: 9pt;"><br /></span></div>
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<br /></div>
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<span style="font-size: 9.0pt; mso-fareast-language: PT-BR;"><span style="mso-spacerun: yes;"> </span>No contexto desse modelo, determine</span></div>
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<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 11.35pt; margin-right: 0cm; margin-top: 0cm; mso-layout-grid-align: none; text-align: justify; text-autospace: none; text-indent: -11.35pt;">
<span style="font-size: 9.0pt; mso-fareast-language: PT-BR;">a) o sentido do movimento -
de dentro para fora ou de fora para dentro da célula - dos íons de cloro (<span style="mso-text-raise: -3.0pt; position: relative; top: 3.0pt;"></span>Cl -) e de cálcio (Ca<sup>2+</sup>), presentes nas soluções intra
e extracelular;</span></div>
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<span style="font-size: 9.0pt; mso-fareast-language: PT-BR;">b) a intensidade <i>E </i>do
campo elétrico no interior da membranac) as intensidades <span style="mso-text-raise: -3.0pt; position: relative; top: 3.0pt;"></span> FCl e <span style="mso-bidi-font-style: italic;">FCa<i> </i></span>das
forças elétricas que atuam, respectivamente, nos íons <span style="mso-text-raise: -3.0pt; position: relative; top: 3.0pt;"></span><span style="mso-spacerun: yes;">Cl- </span>e Ca<sup>2+</sup>
enquanto atravessam a membrana;</span></div>
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<span style="font-size: 9.0pt; mso-fareast-language: PT-BR;">d) o valor da carga elétrica
<i>Q </i>na superfície da membrana em contato com o exterior da célula, se a
capacitância <i>C </i>do sistema for igual a 12 pF (12.10<sup>-12</sup> F)</span></div>
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<a href="http://www.blogger.com/blogger.g?blogID=5334900447459769323" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"></a><a href="http://www.blogger.com/blogger.g?blogID=5334900447459769323" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"></a><a href="http://www.blogger.com/blogger.g?blogID=5334900447459769323" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"></a><a href="http://www.blogger.com/blogger.g?blogID=5334900447459769323" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"></a><br /></div>
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<span style="font-size: 9.0pt; mso-fareast-language: PT-BR;">NOTE E ADOTE</span></div>
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<span style="font-size: 9pt;">1)Carga do elétron = <span style="mso-text-raise: -4.0pt; position: relative; top: 4.0pt;"></span> - 1,6.10</span><span style="font-size: 9.0pt; mso-fareast-language: PT-BR;"></span><!--[if gte mso 9]><xml>
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<![endif]--><sup><span style="font-family: "Arial","sans-serif"; font-size: 9.0pt; line-height: 115%; mso-ansi-language: PT-BR; mso-bidi-language: AR-SA; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT-BR;">-19 </span></sup><span style="font-size: 9.0pt; mso-fareast-language: PT-BR;"><span style="mso-spacerun: yes;">C </span><span style="mso-bidi-font-style: italic;">2) A capacitância do Capacitor C é dada por:
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<span style="font-size: 9pt;">RESOLUÇÃO:</span></div>
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<span style="font-size: 10.0pt; mso-fareast-language: ZH-CN;">a) Sabemos que cargas
negativas tendem para pontos de maior potencial elétrico e cargas positivas
tendem para pontos de maior potencial elétrico. Assim, os íons de Cloro a)
Sabemos que cargas negativas tendem para pontos de maior potencial elétrico e
cargas positivas tendem para pontos de maior potencial elétrico. Assim, os íons
de Cloro Cl-<span style="mso-text-raise: -9.0pt; position: relative; top: 9.0pt;"></span><span style="mso-spacerun: yes;"> </span>movem-se de dentro
para fora da célula e os íons de cálcio Ca++ <span style="mso-text-raise: -9.0pt; position: relative; top: 9.0pt;"></span><span style="mso-spacerun: yes;"> </span>movem-se em sentido
oposto, de fora para dentro da célula.</span></div>
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<span style="font-size: 10.0pt; mso-fareast-language: ZH-CN;">b) Como o potencial
elétrico varia linearmente com a distância, o campo elétrico ao longo da
membrana da célula é constante. Sendo <b style="mso-bidi-font-weight: normal;">U</b>
a ddp entre o interior e o exterior da célula, da expressão do campo elétrico
uniforme vem:</span></div>
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<span style="font-size: 10.0pt; mso-fareast-language: ZH-CN;"><span style="mso-text-raise: -12.0pt; position: relative; top: 12.0pt;">E.d = U : E = U/d : E = 64.10-3 /8.10-9 : E = 8.106 V/m</span></span></div>
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<span style="font-size: 10.0pt; mso-fareast-language: PT-BR;">c) Os íons de cloro têm um
elétron em excesso, portanto sua carga é -1,6.10-19 C .<span style="mso-text-raise: -5.0pt; position: relative; top: 5.0pt;"> </span><span style="mso-spacerun: yes;"> </span>Os íons de cálcio têm
valência +2, portanto têm carga <span style="mso-text-raise: -5.0pt; position: relative; top: 5.0pt;"> </span><span style="mso-spacerun: yes;"> </span>+ 3,2.10-19 C. Da expressão da força
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<span style="font-size: 10pt;"> FCl = 1,6.10-19 . 8.106 : FCl = 1,28.10-12 N</span></div>
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<span style="font-size: 10pt;"> FCa = 3,,2.10-19 8.106 : FCa.= 2,56.10-12 N </span></div>
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<span style="font-size: 10.0pt; mso-fareast-language: PT-BR;">d) Do gráfico, o potencial
no interior da célula é nulo. Então, <span style="mso-text-raise: -3.0pt; position: relative; top: 3.0pt;">E = U = 64.103 V</span></span></div>
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<span style="font-family: "Arial","sans-serif"; font-size: 10pt; line-height: 115%;"><span style="position: relative; top: 10pt;">Q = C.V : Q = 12.10-12 . 64.103 : Q = 7,68.10-13 C</span></span><!--[if !mso]>
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Anonymoushttp://www.blogger.com/profile/17186584252567066804noreply@blogger.com2tag:blogger.com,1999:blog-5334900447459769323.post-32138326617063980282012-09-09T10:50:00.002-07:002012-09-10T04:00:37.985-07:00Terremotos no mar.<!--[if !mso]>
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<div class="MsoNormal" style="text-align: justify;">
<span style="mso-spacerun: yes;"> </span>Um abalo sísmico com epicentro no fundo do
mar pode dar início a uma onda que se propaga na superfície da água com
velocidade inicial v dada por :<span style="mso-spacerun: yes;"> </span><img alt="" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAAAaCAIAAACIHs0YAAAA10lEQVRYhe1Yyw6AIAzj/38aTxqBroxtQIj24IHH2rIxjSkfjrRbgBe/AQOlG/sNREYLjKWlPNpArPp8hIG27otZn55h2DLwAQNVmqSsafqaWYptS5LWhd82KWb3LJ5BuEAUvcBAm3ay6/0sZiHBDPVtWE3OK91eA847QBRzRrIGRAw5flyvaKTT5nsmWVGaAZOj8UMWjN2BKHQNwAzAmhF7VJhYBFLBvCMNUJjFaQl0BuCIKr5N1gDBfbS8hMzVu+JbKKo34OCT4hYcpxvI017t+f8rsR8XUSu8M+CRA+AAAAAASUVORK5CYII=" /><span style="mso-spacerun: yes;"> </span>onde g é a gravidade local e h é profundidade
do oceano. A energia E que a onda que se propaga na superfície da água
transporta é dada por: <img alt="" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEoAAAAVCAIAAABuau8EAAAAy0lEQVRYhe2VQQ7AIAgE+f+n6aUxRhCWomkk7qk1dGFELHFp0d8F7NXFO0RERDTiFMFrYANhEbwmH480JVP2JqtsWcDIFT3BGLS6jrwha8OGzt4+vCVNa4a9lVzh2eFUn5OlrHLrrdwD/xEvNJ/qvqqGs9dZhe5++VeL/T0i0EcSGpFuzBsw+9JNAHYPaV0oe2j3P+LhCg2eGxy985z/BliWlSCyX26rU3hb2RBD8EYB3bjHU8cpgydNVFu7va2fiJWFV1IX72QVx3sAguZzboLp2KcAAAAASUVORK5CYII=" /><span style="mso-fareast-language: PT-BR; mso-no-proof: yes;"></span><span style="mso-spacerun: yes;"> </span>onde K é uma constante de proporcionalidade, v
é a velocidade de propagação da onda na superfície da água e a A a amplitude da
onda. Sabendo que a energia<span style="mso-spacerun: yes;"> </span>E é praticamente
uma constante e que a equação fundamental da ondulatória é dada por V =<i> λ</i> <span style="font-family: Symbol; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-char-type: symbol; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin; mso-symbol-font-family: Symbol;"><span style="mso-char-type: symbol; mso-symbol-font-family: Symbol;"></span></span>.f , sendo f a frequência,
mantida constante. Considere g = 10 m/s<sup>2</sup></div>
<div class="MsoNormal">
<span style="mso-spacerun: yes;"> </span>Atenda as
solicitações seguintes:<span style="font: 7pt "Times New Roman";"> </span><br />
a) Calcule <span style="mso-spacerun: yes;"> </span>as velocidades das ondas no fundo do mar v<sub>1
</sub>(h<sub>1</sub>= 4000 m) e na costa v<sub>2</sub> (h<sub>2</sub>= 6,4 m)</div>
<div class="MsoListParagraphCxSpMiddle" style="mso-list: l1 level1 lfo1; text-indent: -18.0pt;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-list: Ignore;">b </span></span> b) Se o comprimento de onda no fundo do mar é <i>λ</i><sub>1</sub> = 150 km.
Determine o comprimento de onda na costa <i>λ</i><sub>2.</sub></div>
<div class="MsoListParagraphCxSpLast" style="mso-list: l1 level1 lfo1; text-indent: -18.0pt;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-list: Ignore;">c c)<span style="font: 7.0pt "Times New Roman";">
</span></span></span>Determine a amplitudes da onda na costa A<sub>2</sub>
, sabendo que no fundo do mar A<sub>1</sub> = 1m</div>
<div class="MsoNormal">
Solução:</div>
<div class="MsoListParagraphCxSpFirst" style="mso-list: l0 level1 lfo2; text-indent: -18.0pt;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-list: Ignore;">a a) <span style="font: 7.0pt "Times New Roman";">
</span></span></span>Cálculo da velocidade v1 no fundo do mar</div>
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v1 = (raiz) <span style="font-family: Symbol; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-char-type: symbol; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin; mso-symbol-font-family: Symbol;"><span style="mso-char-type: symbol; mso-symbol-font-family: Symbol;"></span></span>10.4000
= 200 m/s</div>
<div class="MsoListParagraphCxSpMiddle">
b) Cálculo da velocidade v2 na costa</div>
<div class="MsoListParagraphCxSpMiddle">
v2 = <span style="font-family: Symbol; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-char-type: symbol; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin; mso-symbol-font-family: Symbol;"><span style="mso-char-type: symbol; mso-symbol-font-family: Symbol;"></span></span>(raiz)10.6,4
= 8 m/s</div>
<div class="MsoListParagraphCxSpMiddle" style="mso-list: l0 level1 lfo2; text-indent: -18.0pt;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-list: Ignore;">b <span style="font: 7.0pt "Times New Roman";">
</span></span></span>Sendo v = <i>λ</i>.f <a class="new" href="http://pt.wiktionary.org/w/index.php?title=%E2%86%92&action=edit&redlink=1" title="→ (página não existe)">→</a><span style="mso-spacerun: yes;"> </span>f = v/.<i>λ</i>
Teremos:</div>
<div class="MsoListParagraphCxSpMiddle">
V1/<i>λ</i>1
= V2/<i>λ</i>2 <a class="new" href="http://pt.wiktionary.org/w/index.php?title=%E2%86%92&action=edit&redlink=1" title="→ (página não existe)">→</a> 200/150 = 8/<span style="font-family: Symbol; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-char-type: symbol; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin; mso-symbol-font-family: Symbol;"><span style="mso-char-type: symbol; mso-symbol-font-family: Symbol;">l</span></span>2<span style="mso-spacerun: yes;"> </span> <i>λ</i>2 = 6 km</div>
<div class="MsoListParagraphCxSpMiddle" style="mso-list: l0 level1 lfo2; text-indent: -18.0pt;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-list: Ignore;">c<span style="font: 7.0pt "Times New Roman";">
</span></span></span>Sendo a energia constante,vem:</div>
<div class="MsoListParagraphCxSpLast">
<span style="mso-spacerun: yes;"> </span>K.8.(A2)<sup>2</sup> = K.200.(1)<sup>2</sup><span style="mso-spacerun: yes;"> </span><a class="new" href="http://pt.wiktionary.org/w/index.php?title=%E2%86%92&action=edit&redlink=1" title="→ (página não existe)">→</a><span style="mso-spacerun: yes;"> </span>A2 = 5 m</div>
<div class="MsoListParagraphCxSpLast">
<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-Ac-2pQUL1CI/UEzV9auk5tI/AAAAAAAAAEc/257f-4IsSMQ/s1600/tsunami.bmp" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="218" src="http://2.bp.blogspot.com/-Ac-2pQUL1CI/UEzV9auk5tI/AAAAAAAAAEc/257f-4IsSMQ/s320/tsunami.bmp" width="320" /></a></div>
<br />
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm;">
<span style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT-BR;"></span></div>
<div class="MsoNormal">
<span style="mso-spacerun: yes;"> </span>Pela conservação
da Energia mecânica, note que ao diminuir a velocidade da onda ocorre aumento
da energia potencial gravitacional da onda, justificando assim, o aumento da
amplitude da onda.</div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
Adaptado de : </div>
<div class="MsoNormal">
http://fisicamoderna.blog.uol.com.br/arch2006-07-16_2006-07-22.html#2006_07-18_12_13_51-7000670-0</div>
Anonymoushttp://www.blogger.com/profile/17186584252567066804noreply@blogger.com1tag:blogger.com,1999:blog-5334900447459769323.post-20037382444863341032012-09-02T14:45:00.003-07:002012-09-02T14:47:03.375-07:00BIOFÍSICA DO CORPO HUMANO<div style="text-align: justify;">
A ENERGIA NO CORPO HUMANO</div>
<div style="text-align: justify;">
</div>
<div style="text-align: justify;">
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<div class="MsoNormal" style="text-align: justify;">
<span style="font-family: "Times New Roman","serif";"> O
consumo de energia por uma pessoa adulta– na forma de alimentos –é de
aproximadamente 2.500 kcal por dia. Uma pessoa que pratique atletismo, outro
esporte exigente, ou faça trabalho pesado deve consumir bem mais do que isso:
umas 4 horas de atividade pesada por dia, como natação, trabalho na
agricultura, ou alpinismo pode fazer com que uma pessoa precise comer duas
vezes mais do que comeria na ausência dessas atividades. Já crianças ou pessoas
de idade avançada e com pouca atividade física consomem bem menos. Em geral,
mulheres consomem um pouco menos de energia do que homens. Entretanto,
lactantes e grávidas podem precisar de alguma coisa como 300 kcal a 500 kcal a
mais por dia para que possam dar conta das exigências adicionais a que estão
submetidas. O valor “usual” de 2500 kcal/dia é bastante típico para grande
parte dos adultos em atividades também “usuais”.</span></div>
<div class="MsoNormal" style="text-align: justify;">
<span style="font-family: "Times New Roman","serif";"><span style="mso-spacerun: yes;"> </span>Essa energia é usada para manter nosso
organismo em funcionamento, como coração, pulmões e os demais órgãos internos,
e também para fornecer alguma capacidade de trabalho externo que é feito
durante praticamente todo o dia. Em condições de repouso, cerca de 30% da
energia é consumida pelos músculos esqueléticos.</span></div>
<div class="MsoNormal" style="text-align: justify;">
<span style="font-family: "Times New Roman","serif";"><span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span>A
musculação acelera o metabolismo durante a prática dos exercícios e o corpo
consome uma quantidade maior de calorias no treino. A energia gasta não é a
reserva de gordura e sim a reserva da energia muscular, que precisa ser
reposta. E o que o metabolismo faz? Continua trabalhando no pós-treino para
recuperar a energia do músculo utilizando, assim, a gordura de reserva. É desta
forma que o organismo continua “queimando” calorias, mesmo parado. A literatura
mostra que quem faz musculação tem o metabolismo 12% mais acelerado no
pós-treino. Até 15 horas depois, esta taxa continua 7% mais alta. Nas
atividades aeróbicas o metabolismo também fica mais rápido na execução dos
exercícios e mantém o nível acelerado das reações metabólicas até uma hora
depois do término da atividade. Isso significa que o organismo tem um pico no
consumo de calorias, providos da reserva de gordura, até uma hora depois da
prática aeróbica. Neste período, nossa máquina corporal entende que houve um
grande desgaste energético que precisa ser reposto. Uma hora após a prática
aeróbica, o metabolismo fica lento para diminuir o gasto de energia e se
reequilibrar. Por isso o corpo vai consumir menos calorias no pós-treino.</span></div>
<div class="MsoNormal" style="text-align: justify;">
<span style="font-family: "Times New Roman","serif";"><span style="mso-spacerun: yes;"> </span>Um indivíduo que faz musculação consome
mais energia, mesmo quando está em repouso. Quem tem receio do aumento de
volume muscular e acha que músculo e emagrecimento não combinam está
equivocado. Outra vantagem da musculação, em relação à perda de gordura, é o
que chamamos de hipertrofia muscular ou crescimento dos músculos. “Um indivíduo
que pratica musculação tem um aumento da massa magra (músculos) e, para mantê-la,
terá um dispêndio maior de energia, mesmo quando estiver em repouso”, esclarece
Sandro. </span></div>
<div style="text-align: justify;">
</div>
<span style="font-size: small;">FONTES:</span><br />
<span style="font-size: small;">1) http://axpfep1.if.usp.br/~otaviano/energianocorpohumano.html</span><br />
<span style="font-size: small;">2) http://www.superatletas.com.br/revista-17/fisiologia-do-exercicio</span><br />
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
(Unicamp-99) O bíceps é um dos músculos envolvidos no processo de dobrar nossos braços. Esse músculo funciona num sistema de alavanca como é mostrado na figura abaixo. O simples ato de equilibrarmos um objeto na palma da mão, estando o braço em posição vertical e o antebraço em posição horizontal, é o resultado de um equilíbrio das seguintes forças: o peso P do objeto, a força F que o bíceps exerce sobre um dos ossos do antebraço e a força C que o osso do braço exerce sobre o cotovelo. A distância do cotovelo até a palma da mão é a = 0,30 m e a distância do cotovelo ao ponto em que o bíceps está ligado a um dos ossos do antebraço é de d = 0,04 m. O objeto que a pessoa está segurando tem massa M = 2,0 kg. Despreze o peso do antebraço e da mão. (Dado g = 10 m/s2).</div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
</div>
<div style="text-align: justify;">
<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-4IfZx-dyqz8/UEPNj22AgDI/AAAAAAAAAEM/QGoUeh6Fipc/s1600/BRACO.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="77" src="http://3.bp.blogspot.com/-4IfZx-dyqz8/UEPNj22AgDI/AAAAAAAAAEM/QGoUeh6Fipc/s400/BRACO.jpg" width="400" /></a></div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
<br />
<br />
<br />
<br />
<br />
<br />
a. Determine a força F que o bíceps deve exercer no antebraço.<br />
b. Determine a força C que o osso do braço exerce nos ossos do antebraço.</div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
Resolução:</div>
<div style="text-align: justify;">
a) Estabelecendo o equilibrio dos momentos de força (TORQUE) em relação ao ponto de aplicação no cotovelo , vem:</div>
<div style="text-align: justify;">
M (força F) = M (força P)</div>
<div style="text-align: justify;">
F.d = P.a; Sendo P=m.g ,vem:</div>
<div style="text-align: justify;">
F.0,04 = 2.10.0,30</div>
<div style="text-align: justify;">
F= 150 N</div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
b) Estabelecendo a Força resultante igual a zero na direção vertical,vem:</div>
<div style="text-align: justify;">
F = P + C</div>
<div style="text-align: justify;">
150 = 20 + C</div>
<div style="text-align: justify;">
C = 130 N</div>
Anonymoushttp://www.blogger.com/profile/17186584252567066804noreply@blogger.com0tag:blogger.com,1999:blog-5334900447459769323.post-60147677317319172342012-08-26T06:15:00.003-07:002012-08-26T07:16:02.545-07:00FREIOS ABS<div style="text-align: justify;">
O freio ABS ou travão ABS (<a class="mw-redirect" href="http://pt.wikipedia.org/wiki/Acr%C3%B4nimo" title="Acrônimo">acrônimo</a> para a expressão <a href="http://pt.wikipedia.org/wiki/L%C3%ADngua_alem%C3%A3" title="Língua alemã">alemã</a> <i>Antiblockier-Bremssystem</i>, embora mais frequentemente traduzido para a <a href="http://pt.wikipedia.org/wiki/L%C3%ADngua_inglesa" title="Língua inglesa">inglesa</a> <i>Anti-lock Braking System</i>) é um sistema de <a href="http://pt.wikipedia.org/wiki/Trav%C3%A3o" title="Travão">frenagem</a> (travagem) que evita que a <a href="http://pt.wikipedia.org/wiki/Roda" title="Roda">roda</a>
bloqueie (quando o pedal de freio é pisado fortemente) e entre em
derrapagem, deixando o automóvel sem aderência à pista. Assim, evita-se o
descontrole do veículo (permitindo que obstáculos sejam desviados
enquanto se freia) e aproveita-se mais o <a class="mw-redirect" href="http://pt.wikipedia.org/wiki/Atrito_est%C3%A1tico" title="Atrito estático">atrito estático</a>, que é maior que o <a class="mw-redirect" href="http://pt.wikipedia.org/wiki/Atrito_cin%C3%A9tico" title="Atrito cinético">atrito cinético</a> (de deslizamento). </div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-P8U7dokTtoU/UDoZiUDFKtI/AAAAAAAAADM/9j8rnyFuwWA/s1600/FREIO.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://4.bp.blogspot.com/-P8U7dokTtoU/UDoZiUDFKtI/AAAAAAAAADM/9j8rnyFuwWA/s1600/FREIO.jpg" /></a></div>
<div style="text-align: justify;">
<br /></div>
<div style="line-height: 18px; margin-bottom: 8px; text-align: justify;">
<span style="color: black; font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;"><b> <span style="background-color: #999999; color: black;">Hoje trarei uma questão da UFMG que adaptarei . A presente questão inclui cinemática, dinâmica,estática e hidrostática.</span></b></span></div>
<div style="background-color: #999999; color: black; line-height: 18px; margin-bottom: 8px; text-align: justify;">
</div>
<div style="background-color: #999999; color: black; line-height: 18px; margin-bottom: 8px; text-align: justify;">
<span style="font-family: 'sans-serif','TT D 1 FO'; font-size: 11pt;"><b>Ufmg 2007</b>- adaptada Quando
se pisa no pedal de freio a fim de se fazer parar um automóvel, vários
dispositivos entram em ação e fazem com que uma pastilha seja
pressionada contra um disco metálico preso à roda. O atrito entre essa
pastilha e o disco faz com que a roda, depois de certo tempo, pare de
girar. </span></div>
<div style="background-color: #999999; color: black; text-align: justify;">
</div>
<div style="background-color: #999999; color: black; line-height: 18px; margin-bottom: 0px; text-align: justify;">
<span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">Na figura abaixo, está representado, esquematicamente, um sistema simplificado de freio de um automóvel. </span><br />
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-AIzHs_KSaVs/UDouiPbOlSI/AAAAAAAAAD8/5LwFMjgPJJk/s1600/FREIO+UFMG.gif" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="261" src="http://2.bp.blogspot.com/-AIzHs_KSaVs/UDouiPbOlSI/AAAAAAAAAD8/5LwFMjgPJJk/s320/FREIO+UFMG.gif" width="320" /></a></div>
</div>
<div style="background-color: #999999; color: black; text-align: justify;">
</div>
<div style="background-color: #999999; color: black; line-height: 18px; margin-bottom: 8px; text-align: justify;">
</div>
<div style="background-color: #999999; color: black; line-height: 18px; margin-bottom: 8px; text-align: justify;">
<span style="font-family: 'sans-serif','TT D 1 FO'; font-size: 11pt;">Nesse sistema, o pedal de freio </span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">é
</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">fixado a uma alavanca, que, por su</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">a
</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">vez, atua sobre o pistão de um cilindro, </span><span style="font-family: 'sans-serif', 'TT D 4 FO'; font-size: 11pt;">C1</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">. Esse cilindro, cheio de óleo, está conectado a outro cilindro</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">,
</span><span style="font-family: 'sans-serif', 'TT D 4 FO'; font-size: 11pt;">C2</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">, por meio de um tubo. A pastilha de freio mantém-se fixa ao pistão deste último cilindro</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">.
</span></div>
<div style="background-color: #999999; color: black; line-height: 18px; margin-bottom: 16px; text-align: justify;">
<span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">Ao se pisar no pedal de freio, o pistão comprime o óleo existente em </span><span style="font-family: 'sans-serif', 'TT D 4 FO'; font-size: 11pt;">C1</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">, o que faz com que o pistão d</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">e
</span><span style="font-family: 'sans-serif', 'TT D 4 FO'; font-size: 11pt;">C2</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;"> se mova e pressione a pastilha contra o disco de freio</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">.
</span></div>
<div style="background-color: #999999; color: black; line-height: 18px; margin-bottom: 8px; text-align: justify;">
<span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">Considere que o raio do cilindro </span><span style="font-family: 'sans-serif', 'TT D 4 FO'; font-size: 11pt;">C2</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;"> é três vezes maior que o do </span><span style="font-family: 'sans-serif', 'TT D 4 FO'; font-size: 11pt;">C1</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;"> e </span><span style="font-family: 'serif', 'TT D 5 AO', serif; font-size: 12pt;">que </span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">a distância d do pedal de frei</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">o
</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">ao pivô da alavanca corresponde a quatro vezes a distância do pistão </span><span style="font-family: 'sans-serif', 'TT D 4 FO'; font-size: 11pt;">C1</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;"> ao mesmo pivô</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">.
</span></div>
<div style="background-color: #999999; color: black; line-height: 18px; margin-bottom: 16px; text-align: justify;">
<span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">Com base nessas informações, atenda assolicitações seguintes:</span></div>
<div style="background-color: #999999; color: black; line-height: 18px; margin-bottom: 16px; text-align: justify;">
<span style="font-family: 'sans-serif','TT D 1 FO'; font-size: 11pt;">a) O sistema de freios ABS não permite derrapamento entre a roda e a superfície (atrito estático) o que difere do sistema tradicional a disco, do qual ocorre o deslizamento sobre a superfície caracterizando, desta forma, o atrito dinâmico. Sabendo que o atrito estático é maior que o atrito dinâmico (cinético) conforme indicado no gráfico determine a distância mínima necessária d para um veículo parar, em função de Vo (velocidade do veículo no instante de acioinamento do freio), g (aceleração da gravidade local) e </span><b style="font-weight: normal;">µ (coeficiente de atrito)</b><span style="font-family: 'sans-serif','TT D 1 FO'; font-size: 11pt;"><b> </b>no momento em que avista um obstáculo até o momento em que este pára. Considere desprezível o tempo de reação entre o momento em que o obstáculo é visto até o momento que o freio é acionado.espreze a resistência do ar durante a frenagem.</span></div>
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<a href="http://4.bp.blogspot.com/-2mESYHxemZ0/UDocH_buXfI/AAAAAAAAADc/LVC10afNDpM/s1600/atrito.gif" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="200" src="http://4.bp.blogspot.com/-2mESYHxemZ0/UDocH_buXfI/AAAAAAAAADc/LVC10afNDpM/s320/atrito.gif" width="320" /></a></div>
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<span style="font-family: 'sans-serif','TT D 1 FO'; font-size: 11pt;"> </span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">
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<span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;"> b)</span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;"> </span><span style="font-family: 'sans-serif', 'TT D 4 FO'; font-size: 11pt;">DETERMINE </span><span style="font-family: 'sans-serif', 'TT D 1 FO'; font-size: 11pt;">a razão entre a força exercida sobre o pedal de freio e a força com que a pastilha comprime o disco de freio. </span></div>
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<br /></div>
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<span style="font-family: 'sans-serif','TT D 1 FO'; font-size: 11pt;"> Solução:</span></div>
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<span style="font-family: 'sans-serif','TT D 1 FO'; font-size: 11pt;"> a) </span></div>
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<span style="font-family: 'sans-serif','TT D 1 FO'; font-size: 11pt;"> i) Cálculo da desacelereção do veículo:</span></div>
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<span style="font-family: 'sans-serif','TT D 1 FO'; font-size: 11pt;"> Sendo a força de atrito a força resultante sobre o veículo, teremos pela segunda lei de Newtom.</span></div>
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<span style="font-family: 'sans-serif','TT D 1 FO'; font-size: 11pt;"> Fr = - Fat ; onde Fat = </span><span style="font-family: 'sans-serif','TT D 1 FO'; font-size: 11pt;"> </span><b style="font-weight: normal;">µ. N . Sendo N = P = m.g, decorre que: Fat = </b><b style="font-weight: normal;">µ.m.g.Portanto:</b></div>
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<b style="font-weight: normal;"> Fr = - </b><b style="font-weight: normal;">µ.m.g ; Mas, da </b><span style="font-family: 'sans-serif','TT D 1 FO'; font-size: 11pt;">segunda lei de Newtom</span><b style="font-weight: normal;">: Fr = m.a. Portanto, vem:</b></div>
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<b style="font-weight: normal;"> m.a = </b><b style="font-weight: normal;">- </b><b style="font-weight: normal;">µ.m.g</b></div>
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<b style="font-weight: normal;"> a = - </b><b style="font-weight: normal;"> </b><b style="font-weight: normal;">µ..g ; o sinal negativo indica desaceleração.</b></div>
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<b style="font-weight: normal;"> ii) Cálculo da distância necessária </b><span class="st">Δ</span><b style="font-weight: normal;">S para parar </b></div>
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<b style="font-weight: normal;"> Da equação de Torricelli:</b></div>
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<b style="font-weight: normal;"> </b><img alt="" 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/><b style="font-weight: normal;"> </b></div>
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<b style="font-weight: normal;"> onde V = 0 ( pára) e </b><b style="font-weight: normal;">a = - </b><b style="font-weight: normal;"> </b><b style="font-weight: normal;">µ..g. Daí, decorre que</b><b style="font-weight: normal;"> :</b><br />
<b style="font-weight: normal;"> </b><span class="st"> Δ</span><b style="font-weight: normal;">S = <u> </u></b><b><span style="font-family: Arial; font-size: x-small;"><u>v<sub>o</sub></u><sup>2 </sup></span></b></div>
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2.<b style="font-weight: normal;">µ.g</b></div>
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<b style="font-weight: normal;"> Como a distância necessária para parar é inversamene proporcional ao coeficiente de atrito, concluímos que, sendo o coeficiente de atreito estático maior que o dinâmico concluímos que a distância necessária para parar é menor no sistema de freios ABS.</b></div>
<div style="background-color: #999999; color: black;">
<b style="font-weight: normal;"><br /></b>
<b style="font-weight: normal;">observação: Perceba que a distância necessária para parar é diretamente proporcional ao quadrado da velocidade inicial do veículo. Assim, com o dobro da velocidade, a distância necessária para parar seria 4 vezes maior.</b></div>
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<b style="font-weight: normal;"><br /></b>
<b style="font-weight: normal;">b) </b></div>
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<b style="font-weight: normal;"> i) Cálculo da força exercida pelo pistão no cilindro c1:</b></div>
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<b style="font-weight: normal;"><br /></b>
</div>
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<![endif]--> De acordo com o Princípio de Pascal: o aumento de pressão
em um ponto de um fluido (o</div>
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óleo de freio) é transmitido aos outros pontos do fluido. Portanto:<br />
<a href="http://4.bp.blogspot.com/-No7nkf26394/UDooCGXBU1I/AAAAAAAAADs/esJC8L9IGL4/s1600/PASCAL.gif" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://4.bp.blogspot.com/-No7nkf26394/UDooCGXBU1I/AAAAAAAAADs/esJC8L9IGL4/s1600/PASCAL.gif" /></a><br />
ou seja, a força é proporcional à área! Como a área de um
círculo é dada por <span style="font-size: small;"><b><i>A = π. r²</i></b></span> ,e o raio do círculo que compreende o cilindro 2 é 3 vezes maior que o cículo do cilindro 1, teremos:<br />
F1/<span style="font-size: small;"><b><i>π. r² = </i></b></span>F2/<span style="font-size: small;"><b><i>π. (3r)² </i></b></span><span style="font-size: small;"><b><i> </i></b></span><br />
F1/<span style="font-size: small;"><b><i>πr² = </i></b></span>F2/<span style="font-size: small;"><b><i>π.9.r²</i></b></span><br />
<span style="font-size: small;"><b><i> </i></b></span> F1<span style="font-size: small;"><b><i> = </i></b></span>F2/<span style="font-size: small;"><b><i>9 </i></b></span><br />
<b><span style="font-size: small;"><b><i><br /></i></b></span></b><b></b><span style="font-size: small;"><b><i></i></b></span>
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ii)</div>
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O segundo sistema é uma alavanca onde utilizaremos o conceito de momento de uma força tomando como referencial o pivô.Sendo <b>f </b>a força exercida sobre o pedal de freio pelo pé e <b>F2 </b>a força com que a pastila comprime o disco de freio. </div>
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Temos, para o equilíbrio: F1d = f. 4d . Sendo F1 = F2/9, teremos: F2.d/9 = f.4d</div>
<div style="background-color: #999999; color: black;">
resultando: f = 36.F2 : F2/f = 1/36 </div>
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<br /></div>
<div style="background-color: #999999; color: black;">
RESPOSTA: 1/36 </div>
<br /></div>
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Anonymoushttp://www.blogger.com/profile/17186584252567066804noreply@blogger.com1tag:blogger.com,1999:blog-5334900447459769323.post-18374359202928768732012-08-22T14:07:00.002-07:002012-08-22T14:07:07.503-07:00AIR BAG<!--[if !mso]>
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<br />
<div class="MsoNormal">
<u>Valeu FANTÁSTICOS!!! Estamos de volta. Estou recendo muitos
e-mails de todo o Brasil inclusive pessoal de Minas e a Galera de Manaus. Mas,
a qurstão de hoje vai para o futuro médio Isaías Medeiros, aluno de um geande
colégio de Natal-RN.</u></div>
<u>
</u><div class="MsoNormal">
<u> Hoje vamos trabalhar a Física e a Química do AIR BAG de modo
a atender as Ciências da Natureza do Enem. Antes vamos a uma equena introdução:</u></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
<span style="mso-spacerun: yes;"> </span>Airbag, também
conhecido por bolsa de ar ou almofada de ar[1], é um componente de segurança
dos carros, que pode ser usado em algumas máquinas industriais e em robôs de
pesquisa, que funciona de forma simples: quando o carro sofre um grande
impacto, vários sensores dispostos em partes estratégicas do veículo (frontal,
traseiro, lateral direito, lateral esquerdo, atrás dos bancos do passageiro e
motorista, tipo cortina no forro interno da cabina) são acionados emitindo
sinais para uma unidade de controle que por sua vez checa qual sensor foi
atingido e assim aciona o airbag mais adequado.</div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
<span style="mso-spacerun: yes;"> </span>Este dispositivo é
constituído de pastilhas de nitrogênio que são acionadas por uma descarga
elétrica pela central eletrônica dentro de um balão de ar muito resistente, que
é o próprio Airbag; este, por sua vez, se enche rapidamente, amortecendo assim
o choque e evitando que motorista e passageiros sofram danos físicos
principalmente no rosto, peito e coluna. Para evitar o asfixiamento, o Airbag
vai perdendo pressão após o acionamento.</div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
(UFRN -ADAPTADA)<span style="mso-spacerun: yes;"> </span>Os
airbags são um adicional ao cinto de segurança em reduzir a chance de que a
cabeça e a parte superior do corpo de um ocupante bata em alguma parte no
interior do veículo. Eles também ajudam a reduzir o risco de lesões graves,
distribuindo as forças da batida mais uniformemente ao longo do corpo do
ocupante.</div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
<span style="mso-spacerun: yes;"> </span>A figura abaixo
mostra dois gráficos da variação temporal da força que age sobre a cabeça de um
boneco de massa m = 50 kg que foi colocado no lugar do motorista.</div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://1.bp.blogspot.com/-NcuswryzF6k/UDVJz7HL0EI/AAAAAAAAACs/Uh9AxonMoOc/s1600/AIR2.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="195" src="http://1.bp.blogspot.com/-NcuswryzF6k/UDVJz7HL0EI/AAAAAAAAACs/Uh9AxonMoOc/s320/AIR2.png" width="320" /></a></div>
<div class="MsoNormal">
<span style="mso-fareast-language: PT-BR; mso-no-proof: yes;"><br /></span></div>
<div class="MsoNormal">
<span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span>Os dois gráficos foram registrados em duas
colisões de testes de segurança. A única diferença entre essas colisões é que,
na colisão I, se usou a bolsa e, na colisão II, ela não foi usada.</div>
<div class="MsoNormal">
<span style="mso-spacerun: yes;"> </span>Atenda as
solicitações seguintes:</div>
<div class="MsoNormal">
a) Determine o impulso exercido em cada uma das situações.</div>
<div class="MsoNormal">
b) Qual a velocidade do veículo imediatamente antes do
impacto<span style="mso-spacerun: yes;"> </span></div>
<div class="MsoNormal">
c)<span style="mso-spacerun: yes;"> </span>Muitos compostos
químicos sofrem decomposição rápida quando aquecidos. Essa propriedade pode ser
aproveitada para finalidades diversas como, por exemplo, a decomposição térmica
do NaN3, que é aproveitada para inflar os sacos de ar ("air bags")
nos automóveis quando uma colisão acontece. A decomposição do NaN3 leva à
produção de grande quantidade de gás, de acordo com:</div>
<div class="MsoNormal">
<span style="mso-spacerun: yes;">
</span>2NaN3(s) <span style="font-family: "Cambria Math","serif"; mso-bidi-font-family: "Cambria Math";">⇒</span> 2Na(s) + 3N2(g)</div>
<div class="MsoNormal">
Supondo-se que 65g de NaN3 são usados em um "air
bag", Determine a quantidade de gás produzida a 27°C (300 K) e a 1atm .
Dado: Massas molares (g/mol): Na = 23; N = 14. </div>
<div class="MsoNormal">
Solução:</div>
<div class="MsoNormal">
a)<span style="mso-spacerun: yes;"> </span>O impulso é
numericamente igual a área de cada figura:</div>
<div class="MsoNormal">
Situação 1 :</div>
<div class="MsoNormal">
I =4.400/ 2 = 800 N.s</div>
<div class="MsoNormal">
Situação 2:</div>
<div class="MsoNormal">
I= 2.800/2 = 800 N.s</div>
<div class="MsoNormal">
<span style="mso-spacerun: yes;"> </span>Percebe-se que
o impulso é o mesmo , com ou sem air bag, visto que , ele é igual a variação do
momento linear do veículo, produto da massa pela variação de velocidade<span style="mso-spacerun: yes;"> </span>que permanecem constantes em ambas as
situações ( de acordo com o enunciado)</div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
b) Como o impulso é igual a variação do momento linear e
considerando que vf = 0 ( pára após a colisão) , vem:</div>
<div class="MsoNormal">
I =<span style="mso-spacerun: yes;"> </span>m. (vf - vi) </div>
<div class="MsoNormal">
800 = 50. (-vi)</div>
<div class="MsoNormal">
vi = -16 m/s </div>
<div class="MsoNormal">
Em módulo : Vi = 16 m/s ou, em km/h(x 3,6), Vi = 57,6
km/h<span style="mso-spacerun: yes;"> </span></div>
<div class="MsoNormal">
c)<span style="mso-spacerun: yes;"> </span></div>
<div class="MsoNormal">
Calculando as massas moleculares , vem:</div>
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<span style="mso-spacerun: yes;"> </span>2NaN3(s) <span style="font-family: "Cambria Math","serif"; mso-bidi-font-family: "Cambria Math";">⇒</span>
2Na(s) + 3N2(g)</div>
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<span style="mso-spacerun: yes;"> </span>128g<span style="mso-spacerun: yes;"> </span>84 g
</div>
<div class="MsoNormal">
<span style="mso-spacerun: yes;"> </span>65 g<span style="mso-spacerun: yes;"> </span>m</div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
<span> </span>m= 42,65 g</div>
<div class="MsoNormal">
<span style="mso-spacerun: yes;"> </span>Mas: n = m/M<span style="mso-spacerun: yes;"> </span>:<span style="mso-spacerun: yes;"> </span>n =
42,65 / 28<span style="mso-spacerun: yes;"> </span>:<span style="mso-spacerun: yes;"> </span>n = 1,5</div>
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<br /></div>
<div class="MsoNormal">
Portanto:<span style="mso-spacerun: yes;"> </span>PV = n. R .
T</div>
<div class="MsoNormal">
<span style="mso-spacerun: yes;"> </span>1.V
=<span style="mso-spacerun: yes;"> </span>1,5<span style="mso-spacerun: yes;">
</span>.0,082. (300) </div>
<div class="MsoNormal">
<span style="mso-spacerun: yes;"> </span>v =
36,9 litros<span style="mso-spacerun: yes;"> </span></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
<span style="mso-spacerun: yes;"> </span></div>
Anonymoushttp://www.blogger.com/profile/17186584252567066804noreply@blogger.com2tag:blogger.com,1999:blog-5334900447459769323.post-29544367689787813112012-08-20T18:26:00.003-07:002012-08-20T18:31:29.925-07:00Bungee jumpingAtenção galera!!! Aí vai uma questão do Vestibular 2013. Mas antes vamos conhecer um pouco do Bungee jumping!!!<br />
<br />
<b>Bungee jumping</b> é um <a class="mw-redirect" href="http://pt.wikipedia.org/wiki/Esporte" title="Esporte">esporte</a> radical praticado por muitos aventureiros corajosos, que consiste em saltar para o vázio amarrado aos tornozelos a uma <a href="http://pt.wikipedia.org/wiki/Corda" title="Corda">corda</a> elástica.<br />
Segundo uma <a href="http://pt.wikipedia.org/wiki/Lenda" title="Lenda">lenda</a>, tudo começou na <a href="http://pt.wikipedia.org/wiki/Pentecostes_%28ilha%29" title="Pentecostes (ilha)">Ilha de Pentecostes</a>, em <a href="http://pt.wikipedia.org/wiki/Vanuatu" title="Vanuatu">Vanuatu</a>, quando uma mulher traiu o seu <a class="mw-redirect" href="http://pt.wikipedia.org/wiki/Marido" title="Marido">marido</a>
e teve de arranjar maneira de mostrar que era pura, e então ela amarrou
aos seus pés uma videira e ela saltou da árvore. Como estava presa
pelos pés, nada lhe aconteceu. O mesmo não se pode dizer do marido que
saltou atrás dela mas… sem <a href="http://pt.wikipedia.org/wiki/Videira" title="Videira">videira.</a><br />
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="http://1.bp.blogspot.com/-9tQlY-FdWZE/UDLfABp2zDI/AAAAAAAAACE/nfbPFmhmYjk/s1600/b2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="183" src="http://1.bp.blogspot.com/-9tQlY-FdWZE/UDLfABp2zDI/AAAAAAAAACE/nfbPFmhmYjk/s320/b2.jpg" width="320" /></a></div>
<br />
<div style="text-align: justify;">
<h2>
<b style="color: #444444;"> <span style="background-color: #f3f3f3; color: black; font-family: Arial; font-size: small;">Um aventureiro de massa m = 80 kg
planeja saltar do alto de um prédio de 50 metros de altura em relação ao solo (figura 1) , amarrado em um cabo elástico de comprimento de repouso de 12 m (um esporte
radical conhecido por ´bungee jumping´). A outra extremidade do cabo fica
amarrada na ponte. No início, o movimento do saltador é uma queda livre. A
partir do ponto em que o cabo é esticado, o saltador começa a desacelerar até
uma determinada posição, onde pára . Deste momento em diante, o cabo começa a
puxar o saltador para cima. Esta posição, onde o saltador inverte o sentido de
queda que é de 20 metros em relação ao ponto do salto (representado na figura II), marca o seu maior deslocamento vertical com relação à ponte, onde sua velocidade será nula. Considere g = 10 m/s2 , a inexistência de forças de atrito e a velocidade nula no instante imediatamente anterior ao salto. Determine a constante elástica k da corda.</span></b></h2>
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<a href="http://2.bp.blogspot.com/-oMvRL6BU7UA/UDLf7kB193I/AAAAAAAAACM/S5FG072FktE/s1600/bungee.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="230" src="http://2.bp.blogspot.com/-oMvRL6BU7UA/UDLf7kB193I/AAAAAAAAACM/S5FG072FktE/s400/bungee.jpg" width="400" /></a></div>
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<b><span style="font-family: Arial;"><span style="font-size: x-small;"> </span></span></b><span style="font-size: small;"><b style="font-family: Arial,Helvetica,sans-serif;">Solução: Perceba que a sequência das energias envolvidas, pela ordem, é: Energia potencial gravitacional(figura I), energia cinética e energia potencial elástica(figura III) . Para resolvermos a questão iremos considerar que o nível de referência é na posição de deformação máxima( há 20 m da plataforma, conforme figura II) . Devemos perceber ainda que a deformação da corda é de x = 8m, pois se ele está a 20 m da plataforma e a corda tem comprimento em repouso ( não deformada) de 12 m. </b></span></div>
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<span style="font-size: small;"><b> Portanto,aplicando a conservação da energia mecânica devido a inexistência de atrito, teremos:</b></span></div>
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<span style="font-size: small;"><b>Em ( figura 1) = Em (figura 2)</b></span></div>
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<span style="font-size: small;"><b>Ec1 + Ep1 = Ec2 + Ep2</b></span></div>
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<span style="font-size: small;"><b>Onde:</b></span></div>
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<span style="font-size: small;"><b>Ec1 = 0 ( partiu do repouso)</b></span></div>
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<span style="font-size: small;"><b>Ec2 = 0 ( deformação máxima)</b></span></div>
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<span style="font-size: small;"><b>Daí,vem:</b></span></div>
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<span style="font-size: small;"><b>Ep1 = Ep2</b></span></div>
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<span style="font-size: small;"><b>m.g.h = k.x2/2</b></span></div>
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<span style="font-size: small;"><b>80.10.20 = k. (8)2 / 2</b></span></div>
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<span style="font-size: small;"><b>16000 = 32.k</b></span></div>
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<span style="font-size: small;"><b>k = 500 N/m</b></span></div>
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<span style="font-size: small;"><b><br /></b></span></div>
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<span style="font-size: small;"><b>obs: a altura h = 20m é tomada em relação ao nível de referência(deformação máxima da mola) e não em relação ao solo </b></span></div>
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<b style="color: #444444;"><span style="font-family: Arial;"><span style="font-size: x-small;"><br /></span></span></b></div>
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<b style="color: #444444;"><span style="font-family: Arial;"><span style="font-size: x-small;">Eis o vídeo do salto.</span></span></b></div>
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<object class="BLOGGER-youtube-video" classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,40,0" data-thumbnail-src="http://0.gvt0.com/vi/XeWw_zekiMA/0.jpg" height="266" width="320"><param name="movie" value="http://www.youtube.com/v/XeWw_zekiMA&fs=1&source=uds" /><param name="bgcolor" value="#FFFFFF" /><param name="allowFullScreen" value="true" /><embed width="320" height="266" src="http://www.youtube.com/v/XeWw_zekiMA&fs=1&source=uds" type="application/x-shockwave-flash" allowfullscreen="true"></embed></object></div>
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<b style="color: #444444;"><span style="font-family: Arial;"><span style="font-size: x-small;"><br /></span></span></b></div>
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<b style="color: #444444;"><span style="font-family: Arial;"><span style="font-size: x-small;"> </span></span></b></div>
Anonymoushttp://www.blogger.com/profile/17186584252567066804noreply@blogger.com0tag:blogger.com,1999:blog-5334900447459769323.post-9112362321333834182012-08-19T07:46:00.004-07:002012-08-19T08:18:55.765-07:00BIG BANG DA APROVAÇÃOSaudações Vencedores<br />
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