{"id":236,"date":"2014-12-04T22:21:07","date_gmt":"2014-12-04T22:21:07","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=236"},"modified":"2024-09-02T17:00:59","modified_gmt":"2024-09-02T17:00:59","slug":"exercicios-da-unesp-2015","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/universidades-2015\/exercicios-da-unesp-2015\/","title":{"rendered":"Exerc\u00edcios da UNESP 2015"},"content":{"rendered":"

\"\"<\/p>\n

Primeira fase – 2015<\/b><\/span><\/span><\/span><\/p>\n

Universidade Estadual Paulista “J\u00falio de Mesquita Filho”<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>(<\/b><\/span><\/span><\/span>UNESP<\/b><\/span><\/span><\/span>) \u00e9 uma universidade<\/a><\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>p\u00fablica<\/b><\/span><\/span><\/span><\/a>\u00a0<\/b><\/span><\/span><\/span>brasileira<\/a>, com atua\u00e7\u00e3o no ensino, na<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>pesquisa<\/b><\/span><\/span><\/span><\/a>\u00a0<\/b><\/span><\/span><\/span>e na extens\u00e3o de servi\u00e7os \u00e0 comunidade. A institui\u00e7\u00e3o \u00e9 uma das tr\u00eas universidades mantidas pelo governo do<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>estado<\/b><\/span><\/span><\/span><\/a>\u00a0<\/b><\/span><\/span><\/span>de<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>S\u00e3o Paulo<\/a>, ao lado da<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>Universidade de S\u00e3o Paulo<\/b><\/span><\/span><\/span><\/a>\u00a0<\/b><\/span><\/span><\/span>(USP) e da Universidade Estadual de Campinas<\/a><\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>(Unicamp).<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

A UNESP distingue-se das outras universidades estaduais por sua estrutura multicampi que abrange 24<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>munic\u00edpios<\/b><\/span><\/span><\/span><\/a>\u00a0<\/b><\/span><\/span><\/span>do estado \u2013 21<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>campi<\/b><\/i><\/span><\/span><\/span><\/a>\u00a0<\/b><\/span><\/span><\/span>no<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>interior<\/a>, um campus na cidade de<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>S\u00e3o Paulo<\/a>, um campus em<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>S\u00e3o Vicente<\/b><\/span><\/span><\/span><\/a>\u00a0<\/b><\/span><\/span><\/span>e um campus em<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>Registro<\/a>(estes 2 \u00faltimos campi tendo sido os primeiros de uma universidade p\u00fablica no<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>litoral paulista<\/a>).<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sup><\/span><\/a><\/span><\/span><\/p>\n

\u00a0<\/span>Unesp foi a segunda colocada entre as universidades p\u00fablicas no “VIII Pr\u00eamio Melhores Universidades”, presenteado anualmente pela publica\u00e7\u00e3o<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>Guia do Estudante<\/b><\/i><\/span><\/span><\/span><\/a>, da<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>Editora Abril<\/a>.<\/b><\/span><\/span><\/span> <\/b>\u00a0<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>Classifica\u00e7\u00e3o Acad\u00eamica das Universidades Mundiais<\/a>(ARWU – sigla em ingl\u00eas classificou a universidade entre as posi\u00e7\u00f5es 301\u00aa-400\u00aa no mundo e entre as cinco melhores institui\u00e7\u00f5es de ensino superior do Brasil.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

01-(UNESP-SP-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>figura representa<\/b><\/span><\/span><\/span>, de forma simplificada, <\/b><\/span><\/span><\/span>parte <\/b><\/span><\/span><\/span>de um <\/b><\/span><\/span><\/span>sistema de engrenagens <\/b><\/span><\/span><\/span>que tem a fun\u00e7\u00e3o de fazer<\/b><\/span><\/span><\/span>girar duas h\u00e9lices, H<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> e H<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>. <\/b><\/span><\/span><\/span>Um <\/b><\/span><\/span><\/span>eixo ligado a um motor <\/b><\/span><\/span><\/span>gira com <\/b><\/span><\/span><\/span>velocidade angular constante <\/b><\/span><\/span><\/span>e <\/b><\/span><\/span><\/span>nele est\u00e3opresas duas engrenagens, A e B. <\/b><\/span><\/span><\/span>Esse eixo pode se <\/b><\/span><\/span><\/span>movimentar horizontalmente <\/b><\/span><\/span><\/span>assumindo a posi\u00e7\u00e3o <\/b><\/span><\/span><\/span>1 ou2. <\/b><\/span><\/span><\/span><\/p>\n

Na <\/b><\/span><\/span><\/span>posi\u00e7\u00e3o 1,<\/b><\/span><\/span><\/span> a engrenagem <\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/span> acopla-se \u00e0 engrenagem <\/b><\/span><\/span><\/span>C<\/b><\/span><\/span><\/span> e, na <\/b><\/span><\/span><\/span>posi\u00e7\u00e3o 2<\/b><\/span><\/span><\/span>, a engrenagem <\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/span> acopla-se \u00e0engrenagem <\/b><\/span><\/span><\/span>D<\/b><\/span><\/span><\/span>. Com as <\/b><\/span><\/span><\/span>engrenagens B e C acopladas<\/b><\/span><\/span><\/span>, a h\u00e9lice <\/b><\/span><\/span><\/span>H<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>gira com velocidade angular constante <\/b><\/span><\/span><\/span>\u03c9<\/b><\/span><\/span><\/span>1 <\/b><\/span><\/span><\/sub><\/span>e, com as engrenagens <\/b><\/span><\/span><\/span>A e D acopladas<\/b><\/span><\/span><\/span>, a h\u00e9lice <\/b><\/span><\/span><\/span>H<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>gira com velocidade angular constante <\/b><\/span><\/span><\/span>\u03c9<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Considere <\/b><\/span><\/span><\/span>r<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> , r<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span> , r<\/b><\/span><\/span><\/span>C<\/b><\/span><\/span><\/sub><\/span> e r<\/b><\/span><\/span><\/span>D <\/b><\/span><\/span><\/sub><\/span>os raios das engrenagens <\/b><\/span><\/span><\/span>A, B, C e D<\/b><\/span><\/span><\/span>, respectivamente. Sabendo que <\/b><\/span><\/span><\/span>r<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span> = 2r<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span>e que <\/b><\/span><\/span><\/span>r<\/b><\/span><\/span><\/span>C<\/b><\/span><\/span><\/sub><\/span> = R<\/b><\/span><\/span><\/span>D<\/b><\/span><\/span><\/sub><\/span>, \u00e9 correto afirmar que a <\/b><\/span><\/span><\/span>rela\u00e7\u00e3o \u03c9<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>\/\u03c9<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> \u00e9 igual a<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

02-(UNESP-SP-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O <\/b><\/span><\/span><\/span>equipamento <\/b><\/span><\/span><\/span>representado na <\/b><\/span><\/span><\/span>figura <\/b><\/span><\/span><\/span>foi montado com o objetivo de determinar a <\/b><\/span><\/span><\/span>constante el\u00e1stica deuma mola ideal. <\/b><\/span><\/span><\/span>O <\/b><\/span><\/span><\/span>recipiente R, de massa desprez\u00edvel, cont\u00e9m \u00e1gua<\/b><\/span><\/span><\/span>; na sua <\/b><\/span><\/span><\/span>parte inferior<\/b><\/span><\/span><\/span>, h\u00e1 uma <\/b><\/span><\/span><\/span>torneiraT<\/b><\/span><\/span><\/span> que, quando <\/b><\/span><\/span><\/span>aberta<\/b><\/span><\/span><\/span>, permite que a \u00e1gua escoe lentamente com vaz\u00e3o constante e <\/b><\/span><\/span><\/span>caia dentro de outrorecipiente B, inicialmente vazio (sem \u00e1gua), que repousa sobre uma balan\u00e7a. <\/b><\/span><\/span><\/span><\/p>\n

A torneira \u00e9 <\/b><\/span><\/span><\/span>aberta no instante t = 0 <\/b><\/span><\/span><\/span>e os <\/b><\/span><\/span><\/span>gr\u00e1ficos<\/b><\/span><\/span><\/span>representam, em um <\/b><\/span><\/span><\/span>mesmo intervalo de tempo (t\u2019), <\/b><\/span><\/span><\/span>como variam o <\/b><\/span><\/span><\/span>comprimento L damola (gr\u00e1fico1)<\/b><\/span><\/span><\/span>, a partir da configura\u00e7\u00e3o inicial de <\/b><\/span><\/span><\/span>equil\u00edbrio,<\/b><\/span><\/span><\/span> e a <\/b><\/span><\/span><\/span>indica\u00e7\u00e3o da balan\u00e7a (gr\u00e1fico 2).<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Analisando as <\/b><\/span><\/span><\/span>informa\u00e7\u00f5es,<\/b><\/span><\/span><\/span> desprezando as for\u00e7as entre a \u00e1gua que cair no recipiente B e o recipiente R e considerando g = 10 m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>, \u00e9 correto concluir que a <\/b><\/span><\/span><\/span>constante el\u00e1stica k da mola, em N\/m, \u00e9 igual a<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

03-(UNESP-SP-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O <\/b><\/span><\/span><\/span>gol <\/b><\/span><\/span><\/span>da conquista do tetracampeonato pela Alemanha na Copa do Mundo de 2014 foi feito pelo jogador G\u00f6tze. Nessa jogada, ele <\/b><\/span><\/span><\/span>recebeu um cruzamento<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span><\/span>matou a bola no peito<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span><\/span>amortecendo-a, e chutou de esquerdapara fazer o gol. <\/b><\/span><\/span><\/span>Considere que, <\/b><\/span><\/span><\/span>imediatamente antes de tocar o jogador, <\/b><\/span><\/span><\/span>a bola tinha <\/b><\/span><\/span><\/span>velocidade de m\u00f3dulo V<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> = 8 m\/s em uma dire\u00e7\u00e3o perpendicular ao seu peito <\/b><\/span><\/span><\/span>e que, <\/b><\/span><\/span><\/span>imediatamente depois de tocaro jogador, <\/b><\/span><\/span><\/span>sua velocidade manteve-se perpendicular ao peito do jogador,<\/b><\/span><\/span><\/span> por\u00e9m com m\u00f3dulo V<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> = 0,6 m\/se em <\/b><\/span><\/span><\/span>sentido contr\u00e1rio.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Admita que, nessa jogada, a bola ficou em <\/b><\/span><\/span><\/span>contato com o peito do jogador por 0,2 s <\/b><\/span><\/span><\/span>e que, nesse intervalode tempo, a intensidade da <\/b><\/span><\/span><\/span>for\u00e7a resultante (F<\/b><\/span><\/span><\/span>R<\/b><\/span><\/span><\/sub><\/span> ), que atuou sobre ela, variou em fun\u00e7\u00e3o do tempo, conformeo gr\u00e1fico.<\/b><\/span><\/span><\/span><\/p>\n

Considerando a <\/b><\/span><\/span><\/span>massa da bola igual a 0,4 kg, <\/b><\/span><\/span><\/span>\u00e9 correto afirmar que, nessa jogada, o <\/b><\/span><\/span><\/span>m\u00f3dulo da for\u00e7a resultantem\u00e1xima que atuou sobre a bola<\/b><\/span><\/span><\/span>, indicada no gr\u00e1fico por <\/b><\/span><\/span><\/span>F<\/b><\/span><\/span><\/span>m\u00e1x<\/b><\/span><\/span><\/sub><\/span> , \u00e9 igual, em newtons, a<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

04-(UNESP-SP-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

As <\/b><\/span><\/span><\/span>figuras 1 e 2 <\/b><\/span><\/span><\/span>representam uma pessoa segurando uma<\/b><\/span><\/span><\/span>pedra de 12 kg e densidade 2.10<\/b><\/span><\/span><\/span>3 <\/b><\/span><\/span><\/sup><\/span>kg\/m<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>, ambasem repouso <\/b><\/span><\/span><\/span>em rela\u00e7\u00e3o \u00e0 \u00e1gua de um lago calmo, em duas situa\u00e7\u00f5es diferentes. <\/b><\/span><\/span><\/span><\/p>\n

Na figura 1<\/b><\/span><\/span><\/span>, a pedraest\u00e1 <\/b><\/span><\/span><\/span>totalmente imersa na \u00e1gua <\/b><\/span><\/span><\/span>e, na <\/b><\/span><\/span><\/span>figura 2<\/b><\/span><\/span><\/span>, apenas <\/b><\/span><\/span><\/span>um quarto dela est\u00e1 imerso.<\/b><\/span><\/span><\/span> Para manter a pedraem <\/b><\/span><\/span><\/span>repouso na situa\u00e7\u00e3o da figura 1<\/b><\/span><\/span><\/span>, a pessoa exerce sobre ela uma for\u00e7a vertical para cima, constante e de <\/b><\/span><\/span><\/span>m\u00f3dulo F<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span> Para mant\u00ea-la em <\/b><\/span><\/span><\/span>repouso na situa\u00e7\u00e3o da figura 2, <\/b><\/span><\/span><\/span>exerce sobre ela uma for\u00e7a vertical paracima, constante e <\/b><\/span><\/span><\/span>de m\u00f3dulo F<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Considerando a <\/b><\/span><\/span><\/span>densidade da \u00e1gua igual a 10<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span> kg\/m<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>e g = 10 m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>, <\/b><\/span><\/span><\/span>\u00e9 correto afirmar que a <\/b><\/span><\/span><\/span>diferen\u00e7a<\/b><\/span><\/span><\/span><\/p>\n

F<\/b><\/span><\/span><\/span>2 <\/b><\/span><\/span><\/sub><\/span>\u2013 F<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>, em newtons, \u00e9 igual a<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

05-(UNESP-SP-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A energia contida nos alimentos<\/b><\/span><\/span><\/span><\/p>\n

Para determinar o <\/b><\/span><\/span><\/span>valor energ\u00e9tico <\/b><\/span><\/span><\/span>de um alimento, podemos <\/b><\/span><\/span><\/span>queimar<\/b><\/span><\/span><\/span> certa quantidade desse produtoe, com o <\/b><\/span><\/span><\/span>calor liberado<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span><\/span>aquecer determinada massa de \u00e1gua<\/b><\/span><\/span><\/span>. Em seguida, mede-se a <\/b><\/span><\/span><\/span>varia\u00e7\u00e3o de temperaturasofrida pela \u00e1gua depois que todo o produto foi queimado<\/b><\/span><\/span><\/span>, e determina-se a <\/b><\/span><\/span><\/span>quantidade de energia<\/b><\/span><\/span><\/span>liberada na queima do alimento. Essa \u00e9 a energia que tal alimento nos fornece se <\/b><\/span><\/span><\/span>for ingerido.<\/b><\/span><\/span><\/span><\/p>\n

No <\/b><\/span><\/span><\/span>r\u00f3tulo <\/b><\/span><\/span><\/span>de um pacote de <\/b><\/span><\/span><\/span>castanha-de-caju<\/b><\/span><\/span><\/span>, est\u00e1 impressa a <\/b><\/span><\/span><\/span>tabela <\/b><\/span><\/span><\/span>a seguir, com informa\u00e7\u00f5es nutricionaissobre o produto.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Considere que <\/b><\/span><\/span><\/span>150 g de castanha <\/b><\/span><\/span><\/span>tenham sido queimados e que <\/b><\/span><\/span><\/span>determinada massa m de \u00e1gua, <\/b><\/span><\/span><\/span>submetida\u00e0 chama dessa combust\u00e3o, tenha sido <\/b><\/span><\/span><\/span>aquecida de 15 \u00baC para 87 \u00baC.<\/b><\/span><\/span><\/span> Sabendo que o <\/b><\/span><\/span><\/span>calor espec\u00edfco da \u00e1gua l\u00edquida \u00e9 igual a 1 cal\/(g\u00baC) <\/b><\/span><\/span><\/span>e que <\/b><\/span><\/span><\/span>apenas 60% da energia liberada na combust\u00e3o <\/b><\/span><\/span><\/span>tenha efetivamente sidoutilizada para <\/b><\/span><\/span><\/span>aquecer a \u00e1gua, <\/b><\/span><\/span><\/span>\u00e9 <\/b><\/span><\/span><\/span>correto <\/b><\/span><\/span><\/span>afirmar que a <\/b><\/span><\/span><\/span>massa m, em gramas<\/b><\/span><\/span><\/span>, de <\/b><\/span><\/span><\/span>\u00e1gua aquecida <\/b><\/span><\/span><\/span>era igual a<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

06-(UNESP-SP-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

07-(UNESP-SP-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A figura representa <\/b><\/span><\/span><\/span>ondas chegando a uma praia<\/b><\/span><\/span><\/span>. Observa-se que, \u00e0 <\/b><\/span><\/span><\/span>medida que se aproximam da areia, ascristas v\u00e3o mudando de dire\u00e7\u00e3o, <\/b><\/span><\/span><\/span>tendendo a ficar paralelas \u00e0 orla. Isso ocorre devido ao fato de que a <\/b><\/span><\/span><\/span>parteda onda que atinge a regi\u00e3o mais rasa do mar tem sua velocidade de propaga\u00e7\u00e3o diminu\u00edda,<\/b><\/span><\/span><\/span> enquanto aparte que se <\/b><\/span><\/span><\/span>propaga na regi\u00e3o mais profunda permanece com a mesma velocidade at\u00e9 alcan\u00e7ar a regi\u00e3omais rasa, <\/b><\/span><\/span><\/span>alinhando-se com a primeira parte.<\/b><\/span><\/span><\/span><\/p>\n

(www.if.ufrgs.br. Adaptado.)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O que foi <\/b><\/span><\/span><\/span>descrito no texto e na figura <\/b><\/span><\/span><\/span>caracteriza um <\/b><\/span><\/span><\/span>fen\u00f4meno ondulat\u00f3rio chamado<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

08-(UNESP-SP-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Modelos el\u00e9tricos <\/b><\/span><\/span><\/span>s\u00e3o frequentemente utilizados para explicar a <\/b><\/span><\/span><\/span>transmiss\u00e3o de informa\u00e7\u00f5es <\/b><\/span><\/span><\/span>em diversossistemas do corpo humano. O <\/b><\/span><\/span><\/span>sistema nervoso<\/b><\/span><\/span><\/span>, por exemplo, \u00e9 composto por <\/b><\/span><\/span><\/span>neur\u00f4nios (fgura1<\/b><\/span><\/span><\/span>), <\/b><\/span><\/span><\/span>c\u00e9lulas delimitadas <\/b><\/span><\/span><\/span>por uma <\/b><\/span><\/span><\/span>fina membrana <\/b><\/span><\/span><\/span>lipoproteica que separa o <\/b><\/span><\/span><\/span>meio intracelular do meio extracelular. <\/b><\/span><\/span><\/span><\/p>\n

A<\/b><\/span><\/span><\/span>parte interna <\/b><\/span><\/span><\/span>da membrana \u00e9 <\/b><\/span><\/span><\/span>negativamente carregada e a parte externa possui carga positiva (figura 2)<\/b><\/span><\/span><\/span>,de <\/b><\/span><\/span><\/span>maneira an\u00e1loga <\/b><\/span><\/span><\/span>ao que ocorre nas <\/b><\/span><\/span><\/span>placas de um capacitor.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>figura 3<\/b><\/span><\/span><\/span> representa um <\/b><\/span><\/span><\/span>fragmento ampliado dessa membrana, de espessura d, <\/b><\/span><\/span><\/span>que est\u00e1 sob a\u00e7\u00e3o de um<\/b><\/span><\/span><\/span>campo el\u00e9trico uniforme<\/b><\/span><\/span><\/span>, representado na figura por <\/b><\/span><\/span><\/span>suas linhas de for\u00e7a paralelas entre si e orientadaspara cima. <\/b><\/span><\/span><\/span>A <\/b><\/span><\/span><\/span>diferen\u00e7a de potencial <\/b><\/span><\/span><\/span>entre o meio <\/b><\/span><\/span><\/span>intracelular e o extracelular \u00e9 V. <\/b><\/span><\/span><\/span>Considerando a <\/b><\/span><\/span><\/span>cargael\u00e9trica elementar como e, <\/b><\/span><\/span><\/span>o \u00edon de pot\u00e1ssio K+, indicado <\/b><\/span><\/span><\/span>na figura 3<\/b><\/span><\/span><\/span>, sob a\u00e7\u00e3o desse <\/b><\/span><\/span><\/span>campo el\u00e9trico<\/b><\/span><\/span><\/span>, ficariasujeito a uma <\/b><\/span><\/span><\/span>for\u00e7a el\u00e9trica cujo m\u00f3dulo pode ser escrito por<\/b><\/span><\/span><\/span><\/p>\n

No interior No i\"\"<\/b><\/span><\/span><\/span><\/p>\n

09-(UNESP-SP-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

10-(UNESP-SP-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Em 09 de agosto de 1945, uma <\/b><\/span><\/span><\/span>bomba at\u00f4mica<\/b><\/span><\/span><\/span> foi detonada sobre a cidade japonesa de Nagasaki. A <\/b><\/span><\/span><\/span>bomba explodiu a 500 m de altura acima do ponto que ficaria conhecido como \u201cmarco zero\u201d.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

No filme Wolverine Imortal, h\u00e1 uma sequ\u00eancia de imagens na qual o her\u00f3i, acompanhado do militar japon\u00eas Yashida, <\/b><\/span><\/span><\/span>se encontrava a 1 km do marco zero e a 50 m de um po\u00e7o.<\/b><\/span><\/span><\/span> No <\/b><\/span><\/span><\/span>momento da<\/b><\/span><\/span><\/span> <\/b>explos\u00e3o,<\/b><\/span><\/span><\/span> <\/b>os dois correm e se refugiam no po\u00e7o<\/b><\/span><\/span><\/span>, chegando nesse local no momento exato em que uma nuvem de poeira e material radioativo, provocada pela explos\u00e3o, passa por eles.<\/b><\/span><\/span><\/span><\/p>\n

A <\/b><\/span><\/span><\/span>figura a seguir<\/b><\/span><\/span><\/span> mostra as posi\u00e7\u00f5es do <\/b><\/span><\/span><\/span>\u201cmarco zero\u201d, da explos\u00e3o da bomba, do po\u00e7o e dos personagens do filme no momento da explos\u00e3o da bomba.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Se os <\/b><\/span><\/span><\/span>ventos <\/b><\/span><\/span><\/span>provocados pela explos\u00e3o foram <\/b><\/span><\/span><\/span>de 800 km\/h e adotando a aproxima\u00e7\u00e3o \u221a5 =2,24,<\/b><\/span><\/span><\/span> os <\/b><\/span><\/span><\/span>personagens correram<\/b><\/span><\/span><\/span> at\u00e9 o po\u00e7o, em linha reta, com uma <\/b><\/span><\/span><\/span>velocidade m\u00e9dia, em km\/h, de aproximadamente<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

 <\/p>\n

Confira a resolu\u00e7\u00e3o comentada!<\/a><\/span><\/h3>\n","protected":false},"excerpt":{"rendered":"

Primeira fase – 2015 Universidade Estadual Paulista “J\u00falio de Mesquita Filho”\u00a0(UNESP) \u00e9 uma universidade\u00a0p\u00fablica\u00a0brasileira, com atua\u00e7\u00e3o no ensino, na\u00a0pesquisa\u00a0e na extens\u00e3o de servi\u00e7os \u00e0 comunidade. A institui\u00e7\u00e3o \u00e9 uma das tr\u00eas universidades mantidas pelo governo do\u00a0estado\u00a0de\u00a0S\u00e3o Paulo, ao lado da\u00a0Universidade de S\u00e3o Paulo\u00a0(USP) e da Universidade Estadual de Campinas\u00a0(Unicamp). A UNESP distingue-se das outras universidades estaduais por sua estrutura multicampi<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":5,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-236","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/236","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/comments?post=236"}],"version-history":[{"count":2,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/236\/revisions"}],"predecessor-version":[{"id":240,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/236\/revisions\/240"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/5"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}