{"id":39,"date":"2014-11-14T21:37:39","date_gmt":"2014-11-14T21:37:39","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=39"},"modified":"2024-09-02T16:42:43","modified_gmt":"2024-09-02T16:42:43","slug":"resolucao-da-espcex-2015","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/universidades-2015\/exercicios-da-escola-preparatoria-de-cadetes-do-exercito-espcex-2015\/resolucao-da-espcex-2015\/","title":{"rendered":"Resolu\u00e7\u00e3o da EsPCEx 2015"},"content":{"rendered":"

RESOLU\u00c7\u00d5ES<\/b><\/span><\/span><\/span><\/p>\n

01- Reflex\u00e3o total:<\/b><\/span><\/span><\/span><\/p>\n

Fazendo a luz se refratar da <\/b><\/span><\/span><\/span>\u00e1gua (mais refringente, maior \u00edndice de refra\u00e7\u00e3o) <\/b><\/span><\/span><\/span>para o <\/b><\/span><\/span><\/span>ar (menos refringente, menor \u00edndice de refra\u00e7\u00e3o)<\/b><\/span><\/span><\/span>, veja o que ocorre na sequ\u00eancia das figuras abaixo:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Verifique na <\/b><\/span><\/span><\/span>figura 3<\/b><\/span><\/span><\/span> que, quando a luz incide na superf\u00edcie da \u00e1gua com <\/b><\/span><\/span><\/span>\u00e2ngulo r\u2019\u2019<\/b><\/span><\/span><\/span>, ela se <\/b><\/span><\/span><\/span>refrata no ar <\/b><\/span><\/span><\/span>praticamente <\/b><\/span><\/span><\/span>paralelo \u00e0 superf\u00edcie da \u00e1gua (emerg\u00eancia rasante). <\/b><\/span><\/span><\/span>Nesse caso espec\u00edfico, denominamos <\/b><\/span><\/span><\/span>r\u2019\u2019 de\u00a0<\/b><\/span><\/span><\/span>\u00e2ngulo limite L.<\/b><\/span><\/span><\/span><\/p>\n

A partir da\u00ed come\u00e7a o que denominamos de\u00a0<\/b><\/span><\/span><\/span>reflex\u00e3o total.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 I\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 II<\/b><\/span><\/span><\/span><\/p>\n

Para <\/b><\/span><\/span><\/span>qualquer \u00e2ngulo de incid\u00eancia maior que o \u00e2ngulo limite L <\/b><\/span><\/span><\/span>( i\u00a0>\u00a0L)<\/b><\/span><\/span><\/span>, o raio de luz sofre <\/b><\/span><\/span><\/span>reflex\u00e3o total ou reflex\u00e3o interna retornando \u00e0 \u00e1gua tal que i \u2265 r.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Condi\u00e7\u00f5es para que ocorra reflex\u00e3o total:<\/b><\/span><\/span><\/span><\/p>\n

1<\/b><\/span><\/span><\/span>a<\/b><\/span><\/span><\/sup><\/span>\u00a0\u2013 A luz deve se propagar do <\/b><\/span><\/span><\/span>meio <\/b><\/span><\/span><\/span>mais <\/b><\/span><\/span><\/span>refringente (maior \u00edndice) para o meio <\/b><\/span><\/span><\/span>menos<\/b><\/span><\/span><\/span> refringente (menor \u00edndice)<\/b><\/span><\/span><\/span><\/p>\n

2<\/b><\/span><\/span><\/span>a<\/b><\/span><\/span><\/sup><\/span>\u00a0\u2013 A luz deve incidir com <\/b><\/span><\/span><\/span>\u00e2ngulo sempre maior que o \u00e2ngulo limite L.<\/b><\/span><\/span><\/span><\/p>\n

Comparando essas <\/b><\/span><\/span><\/span>duas condi\u00e7\u00f5es <\/b><\/span><\/span><\/span>com as <\/b><\/span><\/span><\/span>afirmativas do exerc\u00edcio:<\/b><\/span><\/span><\/span><\/p>\n

(I) <\/b><\/span><\/span><\/span>O feixe luminoso propaga-se <\/b><\/span><\/span><\/span>do meio menos refringente para o meio mais refringente. <\/b><\/span><\/span><\/span>(Falsa)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

(II) <\/b><\/span><\/span><\/span>Para que ela ocorra, o \u00e2ngulo de incid\u00eancia \u03b1 <\/b><\/span><\/span><\/span>deve ser <\/b><\/span><\/span><\/span>inferior ao \u00e2ngulo limite <\/b><\/span><\/span><\/span>da superf<\/b><\/span><\/span><\/span>\u00ed<\/b><\/span><\/span><\/span>cie de separa<\/b><\/span><\/span><\/span>\u00e7<\/b><\/span><\/span><\/span>\u00e3o entre o n<\/b><\/span><\/span><\/span>\u00fa<\/b><\/span><\/span><\/span>cleo e a casca. <\/b><\/span><\/span><\/span>(Falsa)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

(III) <\/b><\/span><\/span><\/span>O <\/b><\/span><\/span><\/span>\u00e2ngulo limite <\/b><\/span><\/span><\/span>da superf<\/b><\/span><\/span><\/span>\u00ed<\/b><\/span><\/span><\/span>cie de separa<\/b><\/span><\/span><\/span>\u00e7<\/b><\/span><\/span><\/span>\u00e3o entre <\/b><\/span><\/span><\/span>o n<\/b><\/span><\/span><\/span>\u00fa<\/b><\/span><\/span><\/span>cleo e a casca depende do <\/b><\/span><\/span><\/span>\u00ed<\/b><\/span><\/span><\/span>ndice de refra<\/b><\/span><\/span><\/span>\u00e7<\/b><\/span><\/span><\/span>\u00e3o do n<\/b><\/span><\/span><\/span>\u00fa<\/b><\/span><\/span><\/span>cleo e da casca. <\/b><\/span><\/span><\/span>(Correta)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

(IV) <\/b><\/span><\/span><\/span>O feixe luminoso <\/b><\/span><\/span><\/span>n\u00e3o sofre refra<\/b><\/span><\/span><\/span>\u00e7<\/b><\/span><\/span><\/span>\u00e3o <\/b><\/span><\/span><\/span>na superf<\/b><\/span><\/span><\/span>\u00ed<\/b><\/span><\/span><\/span>cie de separa<\/b><\/span><\/span><\/span>\u00e7<\/b><\/span><\/span><\/span>\u00e3o entre o n<\/b><\/span><\/span><\/span>\u00fa<\/b><\/span><\/span><\/span>cleo e a casca.(Correta)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

R- B<\/b><\/span><\/span><\/span><\/p>\n

02- <\/b><\/span><\/span><\/span>Teorema de Stevin:<\/b><\/span><\/span><\/span><\/p>\n

A press\u00e3o no <\/b><\/span><\/span><\/span>interior de um l\u00edquido em equil\u00edbrio hidrost\u00e1tico <\/b><\/span><\/span><\/span>\u00e9 fornecida por <\/b><\/span><\/span><\/span>P=P<\/b><\/span><\/span><\/span>atm<\/b><\/span><\/span><\/sub><\/span>\u00a0+ d<\/b><\/span><\/span><\/span>l\u00edquido<\/b><\/span><\/span><\/sub><\/span>.g.h<\/b><\/span><\/span><\/span> e \u00e9 chamada de <\/b><\/span><\/span><\/span>press\u00e3o total, press\u00e3o absoluta ou simplesmente press\u00e3o.<\/b><\/span><\/span><\/span><\/p>\n

Observe na express\u00e3o do <\/b><\/span><\/span><\/span>Teorema de Stevin <\/b><\/span><\/span><\/span>P=P<\/b><\/span><\/span><\/span>atm<\/b><\/span><\/span><\/sub><\/span>\u00a0+ d<\/b><\/span><\/span><\/span>l\u00edquido<\/b><\/span><\/span><\/sub><\/span>.g.h <\/b><\/span><\/span><\/span>que a <\/b><\/span><\/span><\/span>press\u00e3o <\/b><\/span><\/span><\/span>P <\/b><\/span><\/span><\/span>exercida por uma <\/b><\/span><\/span><\/span>coluna l\u00edquida n\u00e3o depende<\/b><\/span><\/span><\/span> das <\/b><\/span><\/span><\/span>dimens\u00f5es do recipiente <\/b><\/span><\/span><\/span>que a cont\u00e9m, mas apenas da <\/b><\/span><\/span><\/span>natureza do l\u00edquido<\/b><\/span><\/span><\/span>, fornecida pela sua <\/b><\/span><\/span><\/span>densidade (d), do local (g) e da altura da coluna (h).<\/b><\/span><\/span><\/span><\/p>\n

Uma das conseq\u00fc\u00eancias do teorema de Stevin \u00e9 de que <\/b><\/span><\/span><\/span>todos os pontos de uma superf\u00edcie <\/b><\/span><\/span><\/span>horizontal (<\/b><\/span><\/span><\/span>a uma mesma altura h<\/b><\/span><\/span><\/span>) suportam a mesma press\u00e3o, desde que o <\/b><\/span><\/span><\/span>l\u00edquido seja o mesmo.<\/b><\/span><\/span><\/span><\/p>\n

Uma das utilidades pr\u00e1ticas dessa conseq\u00fc\u00eancia s\u00e3o os <\/b><\/span><\/span><\/span>vasos comunicantes<\/b><\/span><\/span><\/span>, onde um <\/b><\/span><\/span><\/span>mesmo<\/b><\/span><\/span><\/span> <\/b><\/p>\n

\"\"<\/p>\n

l\u00edquido<\/b><\/span><\/span><\/span> que est\u00e1 em recipientes de <\/b><\/span><\/span><\/span>formatos e volumes diferentes<\/b><\/span><\/span><\/span>, interligados entre si,\u00a0<\/b><\/span><\/span><\/span>ficam <\/b><\/span><\/span><\/span>sempre na mesma altura<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span><\/span>pois suportam a mesma press\u00e3o<\/b><\/span><\/span><\/span><\/p>\n

R- A<\/b><\/span><\/span><\/span><\/p>\n

03- <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

04- <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

05- <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

Um\u00a0<\/b><\/span><\/span><\/span>sistema\u00a0<\/b><\/span><\/span><\/span>de corpos r\u00edgidos (no caso, os <\/b><\/span><\/span><\/span>tr\u00eas fios<\/b><\/span><\/span><\/span>), pode ser estudado pelo <\/b><\/span><\/span><\/span>centro de massa <\/b><\/span><\/span><\/span>desse sistema. Para isso, voc\u00ea pode <\/b><\/span><\/span><\/span>admitir que toda a massa do sistema<\/b><\/span><\/span><\/span>, esteja concentrada no <\/b><\/span><\/span><\/span>centro de massa (no nosso caso, o ponto P) <\/b><\/span><\/span><\/span>e que nele estejam aplicadas todas as <\/b><\/span><\/span><\/span>for\u00e7as<\/b><\/span><\/span><\/span> externas (no caso, as <\/b><\/span><\/span><\/span>for\u00e7as magn\u00e9ticas<\/b><\/span><\/span><\/span>) (figura 2 abaixo).<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Veja a sequ\u00eancia:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

06- <\/b><\/span><\/span><\/span>Observe na <\/b><\/span><\/span><\/span>figura abaixo <\/b><\/span><\/span><\/span>que a parcela do <\/b><\/span><\/span><\/span>peso P<\/b><\/span><\/span><\/span> que \u00e9 transmitida at\u00e9 o <\/b><\/span><\/span><\/span>ponto B <\/b><\/span><\/span><\/span>da barra vale <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

F<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span>=P\/8.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

C\u00e1lculo <\/b><\/span><\/span><\/span>do momento de cada for\u00e7a <\/b><\/span><\/span><\/span>com o polo em A e estabelecendo o sentido <\/b><\/span><\/span><\/span>hor\u00e1rio de rota\u00e7\u00e3o como positivo <\/b><\/span><\/span><\/span>e o anti-hor\u00e1rio como negativo<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

07- <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"\"\"\"\"<\/p>\n

08- <\/b><\/span><\/span><\/span>Sendo o <\/b><\/span><\/span><\/span>volt\u00edmetro ideal <\/b><\/span><\/span><\/span>ele possui <\/b><\/span><\/span><\/span>resist\u00eancia interna infinita <\/b><\/span><\/span><\/span>(isolante), por ele n\u00e3o circula corrente el\u00e9trica, ent\u00e3o voc\u00ea pode <\/b><\/span><\/span><\/span>retir\u00e1-lo do circuito, <\/b><\/span><\/span><\/span>que fica conforme a figura abaixo:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Na <\/b><\/span><\/span><\/span>sequ\u00eancia a seguir <\/b><\/span><\/span><\/span>est\u00e1 sendo calculada a resist\u00eancia el\u00e9trica do <\/b><\/span><\/span><\/span>resistor equivalente<\/b><\/span><\/span><\/span>:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Veja na <\/b><\/span><\/span><\/span>figura<\/b><\/span><\/span><\/span> abaixo que a <\/b><\/span><\/span><\/span>corrente el\u00e9trica <\/b><\/span><\/span><\/span>que circula pelo <\/b><\/span><\/span><\/span>amper\u00edmetro <\/b><\/span><\/span><\/span>(<\/b><\/span><\/span><\/span>indica\u00e7\u00e3o do mesmo<\/b><\/span><\/span><\/span>) \u00e9 de <\/b><\/span><\/span><\/span>2,5A <\/b><\/span><\/span><\/span>e veja tamb\u00e9m as <\/b><\/span><\/span><\/span>correntes<\/b><\/span><\/span><\/span> que circulam por <\/b><\/span><\/span><\/span>cada resistor:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>diferen\u00e7a de potencial (tens\u00e3o, voltagem) <\/b><\/span><\/span><\/span>entre <\/b><\/span><\/span><\/span>A e B<\/b><\/span><\/span><\/span> \u00e9 fornecida por <\/b><\/span><\/span><\/span>U<\/b><\/span><\/span><\/span>AB<\/b><\/span><\/span><\/sub><\/span>=R.i<\/b><\/span><\/span><\/span>=0,3.1,25=<\/b><\/span><\/span><\/span>0,375V.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>diferen\u00e7a de potencial (tens\u00e3o, voltagem) <\/b><\/span><\/span><\/span>entre <\/b><\/span><\/span><\/span>A e C<\/b><\/span><\/span><\/span> \u00e9 fornecida por <\/b><\/span><\/span><\/span>U<\/b><\/span><\/span><\/span>AC<\/b><\/span><\/span><\/sub><\/span>=R.i<\/b><\/span><\/span><\/span>=0,6.1,25=<\/b><\/span><\/span><\/span>0,75V.<\/b><\/span><\/span><\/span><\/p>\n

U<\/b><\/span><\/span><\/span>AB <\/b><\/span><\/span><\/sub><\/span>= V<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> \u2013 V<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span> <\/b>V<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> \u2013 V<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span> = 0,375V<\/b><\/span><\/span><\/span> U<\/b><\/span><\/span><\/span>AC<\/b><\/span><\/span><\/sub><\/span> = V<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> \u2013 V<\/b><\/span><\/span><\/span>C<\/b><\/span><\/span><\/sub><\/span> <\/b>V<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> \u2013 V<\/b><\/span><\/span><\/span>C<\/b><\/span><\/span><\/sub><\/span> = 0,75V.<\/b><\/span><\/span><\/span><\/p>\n

U<\/b><\/span><\/span><\/span>AC<\/b><\/span><\/span><\/sub><\/span> \u2013 U<\/b><\/span><\/span><\/span>AB<\/b><\/span><\/span><\/sub><\/span> <\/b>= 0,75 \u2013 0,375 <\/b><\/span><\/span><\/span>= 0,375V <\/b><\/span><\/span><\/span>(V<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> \u2013 V<\/b><\/span><\/span><\/span>C<\/b><\/span><\/span><\/sub><\/span>) \u2013 (V<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> – V<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span>) = 0,375 = <\/b><\/span><\/span><\/span>V<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> \u2013 V<\/b><\/span><\/span><\/span>C<\/b><\/span><\/span><\/sub><\/span> <\/b>\u2013 V<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> + <\/span><\/span><\/span>V<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span> <\/b>V<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span> – V<\/b><\/span><\/span><\/span>C<\/b><\/span><\/span><\/sub><\/span> =<\/b><\/span><\/span><\/span><\/p>\n

0,375V.<\/b><\/span><\/span><\/span><\/p>\n

Observe na figura que o <\/b><\/span><\/span><\/span>volt\u00edmetro<\/b><\/span><\/span><\/span> est\u00e1 inserido entre os pontos <\/b><\/span><\/span><\/span>B e C <\/b><\/span><\/span><\/span>ent\u00e3o ele <\/b><\/span><\/span><\/span>indicar\u00e1 a ddp<\/b><\/span><\/span><\/span> entre esses dois pontos, ou seja, indicar\u00e1 <\/b><\/span><\/span><\/span>U<\/b><\/span><\/span><\/span>BC<\/b><\/span><\/span><\/sub><\/span>=0,375V.<\/b><\/span><\/span><\/span><\/p>\n

R- A<\/b><\/span><\/span><\/span><\/p>\n

09- <\/b><\/span><\/span><\/span>Sendo a escada de material <\/b><\/span><\/span><\/span>homog\u00eaneo<\/b><\/span><\/span><\/span> seu <\/b><\/span><\/span><\/span>peso \"\"<\/b><\/span><\/span><\/span>est\u00e1 localizado no ponto m\u00e9dio, \u00e0 5\/2=<\/b><\/span><\/span><\/span>2,5m de cada extremidade.<\/b><\/span><\/span><\/span><\/p>\n

Na <\/b><\/span><\/span><\/span>figura abaixo <\/b><\/span><\/span><\/span>est\u00e3o localizadas todas as for\u00e7as que agem sobre a escada, <\/b><\/span><\/span><\/span>seu peso \"\"<\/b><\/span><\/span><\/span>, peso do <\/b><\/span><\/span><\/span>oper\u00e1rio \"\",<\/b><\/span><\/span><\/span> a <\/b><\/span><\/span><\/span>for\u00e7a de tra\u00e7\u00e3o \"\" <\/b><\/span><\/span><\/span>que est\u00e1 decomposta em suas duas parcelas <\/b><\/span><\/span><\/span>vertical \"\"<\/b><\/span><\/span><\/span> <\/b>e <\/b><\/span><\/span><\/span>horizontal \"\", <\/b><\/span><\/span><\/span>al\u00e9m da for\u00e7a <\/b><\/span><\/span><\/span>normal \"\" <\/b><\/span><\/span><\/span>que a escada troca com a parede da casa.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

10- <\/b><\/span><\/span><\/span>P\u00eandulo Simples <\/b><\/span><\/span><\/span>–<\/b><\/span><\/span><\/span>\u00a0 consta de uma <\/b><\/span><\/span><\/span>massa m<\/b><\/span><\/span><\/span>, presa na extremidade inferior de um fio ideal, fixada verticalmente na sua extremidade superior (figura)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Se o p\u00eandulo simples oscilar, com <\/b><\/span><\/span><\/span>oscila\u00e7\u00f5es de pequena abertura (no m\u00e1ximo 15<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span>), <\/b><\/span><\/span><\/span>ele descreve um <\/b><\/span><\/span><\/span>movimento circular de raio R=L, sendo L o comprimento do fio.<\/b><\/span><\/span><\/span><\/p>\n

Seu per\u00edodo <\/b><\/span><\/span><\/span>(T), <\/b><\/span><\/span><\/span>que \u00e9 o tempo que ele demora para efetuar um \u201cvai e vem\u201d completo \u00e9 fornecido pela express\u00e3o:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

onde <\/b><\/span><\/span><\/span>g \u00e9 a acelera\u00e7\u00e3o da gravidade local.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

R- C<\/b><\/span><\/span><\/span><\/p>\n

Confira os Exerc\u00edcios<\/strong><\/a><\/span><\/h3>\n","protected":false},"excerpt":{"rendered":"

RESOLU\u00c7\u00d5ES 01- Reflex\u00e3o total: Fazendo a luz se refratar da \u00e1gua (mais refringente, maior \u00edndice de refra\u00e7\u00e3o) para o ar (menos refringente, menor \u00edndice de refra\u00e7\u00e3o), veja o que ocorre na sequ\u00eancia das figuras abaixo: Verifique na figura 3 que, quando a luz incide na superf\u00edcie da \u00e1gua com \u00e2ngulo r\u2019\u2019, ela se refrata no ar praticamente paralelo \u00e0 superf\u00edcie<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":36,"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-39","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/39","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=39"}],"version-history":[{"count":2,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/39\/revisions"}],"predecessor-version":[{"id":66,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/39\/revisions\/66"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/36"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=39"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}