{"id":4675,"date":"2019-08-05T01:34:04","date_gmt":"2019-08-05T01:34:04","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=4675"},"modified":"2024-07-11T02:57:44","modified_gmt":"2024-07-11T02:57:44","slug":"puc-sp-019","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/universidades-2019\/puc-sp-019\/","title":{"rendered":"PUC-SP-019"},"content":{"rendered":"

 <\/p>\n

<\/p>\n

A\u00a0<\/b><\/span><\/span><\/span>Pontif\u00edcia Universidade Cat\u00f3lica de S\u00e3o Paulo<\/b><\/span><\/span><\/span>\u00a0(<\/b><\/span><\/span><\/span>PUC-SP<\/b><\/span><\/span><\/span>) \u00e9 uma\u00a0institui\u00e7\u00e3o de ensino superior<\/a> privada<\/a>\u00a0e\u00a0cat\u00f3lica<\/a>\u00a0brasileira. \u00c9 mantida pela Funda\u00e7\u00e3o S\u00e3o Paulo (FUNDASP), presidida pelo Gr\u00e3o-Chanceler da Universidade e vinculada \u00e0\u00a0Mitra Arquidiocesana da cidade de S\u00e3o Paulo<\/a>.\u00a0Suas unidades de ensino est\u00e3o distribu\u00eddas em cinco\u00a0<\/b><\/span><\/span><\/span>campi<\/b><\/i><\/span><\/span><\/span>\u00a0universit\u00e1rios, sendo quatro localizados na\u00a0capital do Estado de S\u00e3o Paulo<\/a>: Monte Alegre, Marqu\u00eas de Paranagu\u00e1, Ipiranga e Santana, e um em\u00a0Sorocaba<\/a>, no interior do estado.<\/b><\/span><\/span><\/span><\/p>\n

A PUC-SP constitui uma institui\u00e7\u00e3o privada, filantr\u00f3pica e confessional, mantida pelas mensalidades pagas pelos alunos, cujo ingresso \u00e9 dado por meio do\u00a0vestibular<\/a>, que \u00e9 de responsabilidade da Coordenadoria de Vestibulares e Concursos da PUC-SP.<\/b><\/span><\/span><\/span><\/p>\n

Possui reconhecimento nacional e internacional pelo seu ensino e tradi\u00e7\u00e3o, destacando-se em rankings brasileiros e mundiais de universidades (com as devidas observa\u00e7\u00f5es aos crit\u00e9rios e metodologias empregadas), figurando na conceituada classifica\u00e7\u00e3o “QS World University Rankings<\/a>” de 2018 como sendo a 21\u00aa melhor universidade da\u00a0Am\u00e9rica Latina<\/a>,\u00a0a 52\u00b0 melhor universidade dos\u00a0BRICS<\/a>\u00a0<\/b><\/span><\/span><\/span><\/p>\n

Al\u00e9m disso, a consultoria brit\u00e2nica tamb\u00e9m coloca a PUC-SP na posi\u00e7\u00e3o de 4\u00b0 melhor universidade brasileira no crit\u00e9rio de empregabilidade, expondo-a com a classifica\u00e7\u00e3o de 19\u00b0 se observada a\u00a0Am\u00e9rica Latina<\/a>\u00a0como um todo.\u00a0Tal qualifica\u00e7\u00e3o se repete no\u00a0<\/b><\/span><\/span><\/span>Ranking de Universidades<\/b><\/i><\/span><\/span><\/span>\u00a0do\u00a0MEC<\/a>, que tamb\u00e9m coloca a institui\u00e7\u00e3o, entre as privadas, em primeiro lugar no\u00a0Estado de S\u00e3o Paulo<\/a>\u00a0e em segundo lugar em todo territ\u00f3rio nacional.<\/b><\/span><\/span><\/span>[9]<\/b><\/span><\/span><\/sup><\/span><\/a>\u00a0No\u00a0Ranking Universit\u00e1rio Folha<\/a>\u00a02017, que \u00e9 realizado pelo Jornal\u00a0<\/b><\/span><\/span><\/span>Folha de S.Paulo<\/b><\/i><\/span><\/span><\/span><\/a>, figura na primeira posi\u00e7\u00e3o entre as universidades privadas do Brasil no que se refere \u00e0 qualidade de ensino\u00a0e coloca-se na s\u00e9tima posi\u00e7\u00e3o entre as universidades brasileiras com rela\u00e7\u00e3o \u00e0 visibilidade no mercado de trabalho,<\/b><\/span><\/span><\/span>[11]<\/b><\/span><\/span><\/sup><\/span><\/a>\u00a0sendo a 4\u00b0 entre as privadas neste mesmo quesito. Ademais, 15 cursos da PUC-SP s\u00e3o os melhores do pa\u00eds entre as universidades privadas e outros oito est\u00e3o entre os cinco melhores. <\/b><\/span><\/span><\/span><\/p>\n

01-(PUC-SP-019)<\/span><\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Duas bolas s\u00e3o abandonadas simultaneamente de uma mesma altura,<\/b><\/span><\/span><\/span> conforme <\/b><\/span><\/span><\/span>representado na figura.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

<\/p>\n

A <\/b><\/span><\/span><\/span>massa da bola 1 \u00e9 de 600g <\/b><\/span><\/span><\/span>e a <\/b><\/span><\/span><\/span>da bola 2 \u00e9 de 250g. <\/b><\/span><\/span><\/span>Como <\/b><\/span><\/span><\/span>possuem materiais diferentes,<\/b><\/span><\/span><\/span> ao <\/b><\/span><\/span><\/span>colidirem com o solo, a bola 1 sofre uma perda de 25% de sua energia mec\u00e2nica inicial, enquanto a bola 2 sofre uma perda de 5%. Desprezando a resist\u00eancia do ar, determine, em fun\u00e7\u00e3o de H, <\/b><\/span><\/span><\/span>a<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

diferen\u00e7a entre as alturas m\u00e1ximas alcan\u00e7adas por essas bolas, ap\u00f3s colidirem com o solo. <\/b><\/span><\/span><\/span>Adote <\/b><\/span><\/span><\/span>como refer\u00eancia as bases das bolas e considere g = 10m\/s\u00b2. <\/b><\/span><\/span><\/span><\/p>\n

A) <\/b><\/span><\/span><\/span>0,20H <\/b><\/span><\/span><\/span>B) <\/b><\/span><\/span><\/span>0,25H <\/b><\/span><\/span><\/span>C) <\/b><\/span><\/span><\/span>0,50H <\/b><\/span><\/span><\/span>D) <\/b><\/span><\/span><\/span>0,75H<\/b><\/span><\/span><\/span><\/p>\n

02-(PUC-SP-019)<\/span><\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Uma <\/b><\/span><\/span><\/span>c\u00e2mara escura de orif\u00edcio consiste em uma caixa fechada, de paredes opacas <\/b><\/span><\/span><\/span>e que <\/b><\/span><\/span><\/span>possui um orif\u00edcio em uma de suas faces. <\/b><\/span><\/span><\/span>Na <\/b><\/span><\/span><\/span>face oposta \u00e0 do orif\u00edcio, fixamos um vidro fosco, onde se formam as imagens dos objetos iluminados, localizados no exterior da caixa <\/b><\/span><\/span><\/span>e <\/b><\/span><\/span><\/span>posicionados defronte \u00e0 face com o orif\u00edcio. <\/b><\/span><\/span><\/span>Uma <\/b><\/span><\/span><\/span>placa na qual est\u00e1 impressa a letra G \u00e9 iluminada e disposta em frente a uma c\u00e2mara escura de orif\u00edcio<\/b><\/span><\/span><\/span>. A <\/b><\/span><\/span><\/span>imagem que se forma na face oposta ter\u00e1 a apar\u00eancia:<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

03-(PUC-SP-019)<\/span><\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Considere <\/b><\/span><\/span><\/span>cinco esferas met\u00e1licas condutoras, id\u00eanticas <\/b><\/span><\/span><\/span>e <\/b><\/span><\/span><\/span>bem distantes entre si, apoiadas em suportes isolantes. <\/b><\/span><\/span><\/span><\/p>\n

A <\/b><\/span><\/span><\/span>esfera 1 \u00e9 eletrizada com carga Q, <\/b><\/span><\/span><\/span>estando as <\/b><\/span><\/span><\/span>demais eletricamente neutras. <\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

A <\/b><\/span><\/span><\/span>esfera 1 \u00e9 colocada em contatos sucessivos com as esferas 2, 3, 4 e 5, respectivamente. <\/b><\/span><\/span><\/span><\/p>\n

Ap\u00f3s os contatos citados, as esferas 1, 3 e 5 s\u00e3o postas em contato simult\u00e2neo e depois separadas novamente.<\/b><\/span><\/span><\/span><\/p>\n

Podemos <\/b><\/span><\/span><\/span>afirmar que a carga final da ESFERA 3, ap\u00f3s todos os contatos citados, ser\u00e1 igual <\/b><\/span><\/span><\/span>a: <\/b><\/span><\/span><\/span><\/p>\n

A) <\/b><\/span><\/span><\/span>Q\/8 <\/b><\/span><\/span><\/span>B) <\/b><\/span><\/span><\/span>3Q\/8 <\/b><\/span><\/span><\/span>C) <\/b><\/span><\/span><\/span>13Q\/16 <\/b><\/span><\/span><\/span>D) <\/b><\/span><\/span><\/span>13Q\/48<\/b><\/span><\/span><\/span><\/p>\n

04-(PUC-SP-019)<\/span><\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Considere <\/b><\/span><\/span><\/span>uma part\u00edcula de massa m, suspensa por um fio que descreve um movimento circular de raio r, sobre<\/b><\/span><\/span><\/span> uma <\/b><\/span><\/span><\/span>superf\u00edcie horizontal perfeitamente lisa e com velocidade angular constante, em torno de um eixo vertical imagin\u00e1rio, <\/b><\/span><\/span><\/span>conforme representado na <\/b><\/span><\/span><\/span>figura abaixo.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

<\/p>\n

O <\/b><\/span><\/span><\/span>m\u00f3dulo da tra\u00e7\u00e3o no fio que sustenta a part\u00edcula est\u00e1 representado por T. <\/b><\/span><\/span><\/span>Com <\/b><\/span><\/span><\/span>rela\u00e7\u00e3o \u00e0 situa\u00e7\u00e3o descrita, \u00e9 CORRETO afirmar<\/b><\/span><\/span><\/span> que:<\/b><\/span><\/span><\/span><\/p>\n

A) <\/b><\/span><\/span><\/span>O momento gerado pela for\u00e7a resultante \u00e9 nulo em rela\u00e7\u00e3o ao centro da trajet\u00f3ria. <\/b><\/span><\/span><\/span><\/p>\n

B) <\/b><\/span><\/span><\/span>O vetor quantidade de movimento \u00e9 constante, pois a velocidade angular \u00e9 constante. <\/b><\/span><\/span><\/span><\/p>\n

C) <\/b><\/span><\/span><\/span>O momento gerado pela for\u00e7a resultante, em rela\u00e7\u00e3o ao centro da trajet\u00f3ria, \u00e9 dado por r.Tcos\u03b8. <\/b><\/span><\/span><\/span>D) <\/b><\/span><\/span><\/span>O momento gerado pela for\u00e7a resultante, em rela\u00e7\u00e3o ao centro da trajet\u00f3ria, \u00e9 dado por r.Tsen\u03b8.<\/b><\/span><\/span><\/span><\/p>\n

05-(PUC-SP-019)<\/span><\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

A <\/b><\/span><\/span><\/span>imagem retrata um proj\u00e9til de massa m, atravessando horizontalmente um ovo de espessura e,<\/b><\/span><\/span><\/span> <\/b>que est\u00e1 fixo em um suporte em repouso em rela\u00e7\u00e3o ao solo. <\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Considerando que <\/b><\/span><\/span><\/span>o proj\u00e9til incide no ovo com velocidade de m\u00f3dulo v<\/b><\/span><\/span><\/span>i<\/b><\/span><\/span><\/sub><\/span> ,<\/b><\/span><\/span><\/span> o <\/b><\/span><\/span><\/span>abandona com velocidade de m\u00f3dulo v<\/b><\/span><\/span><\/span>\u0192<\/b><\/span><\/span><\/sub><\/span> e que <\/b><\/span><\/span><\/span>o m\u00f3dulo da for\u00e7a de resist\u00eancia imposta pelo ovo seja invari\u00e1vel,<\/b><\/span><\/span><\/span> <\/b>determine o intervalo de tempo (\u0394t) gasto para atravess\u00e1-lo.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

06-(PUC-SP-019)<\/span><\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Um <\/b><\/span><\/span><\/span>corp\u00fasculo esf\u00e9rico e met\u00e1lico de massa m<\/b><\/span><\/span><\/span> est\u00e1 <\/b><\/span><\/span><\/span>eletrizado com carga +q<\/b><\/span><\/span><\/span> e \u00e9 <\/b><\/span><\/span><\/span>lan\u00e7ado verticalmente para cima, com velocidade inicial v<\/b><\/span><\/span><\/span>i<\/b><\/span><\/span><\/sub><\/span> , <\/b><\/span><\/span><\/span>numa <\/b><\/span><\/span><\/span>regi\u00e3o do espa\u00e7o situada entre duas placas planas, paralelas, muito extensas, uniformemente eletrizadas <\/b><\/span><\/span><\/span>e que <\/b><\/span><\/span><\/span>estabelecem em seu interior um campo el\u00e9trico de m\u00f3dulo E, conforme esquematizado na figura. <\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Adotando o <\/b><\/span><\/span><\/span>m\u00f3dulo da acelera\u00e7\u00e3o da gravidade igual a g,<\/b><\/span><\/span><\/span> <\/b>determine a altura m\u00e1xima alcan\u00e7ada<\/b><\/span><\/span><\/span> pelo <\/b><\/span><\/span><\/span>corp\u00fasculo.<\/b><\/span><\/span><\/span> <\/b>Despreze qualquer forma de atrito<\/b><\/span><\/span><\/span> e <\/b><\/span><\/span><\/span>considere uniformes os campos.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

07-(PUC-SP-019)<\/span><\/b><\/span><\/span><\/span><\/p>\n

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Para os <\/b><\/span><\/span><\/span>sistemas esquematizados abaixo, determine, respectivamente, as rela\u00e7\u00f5es T<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>\/ T<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>, entre os per\u00edodos de oscila\u00e7\u00e3o, e X<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>\/X<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> referente \u00e0s deforma\u00e7\u00f5es el\u00e1sticas sofridas. <\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Considere que <\/b><\/span><\/span><\/span>o corpo m, associado \u00e0s molas, executa um movimento harm\u00f4nico simples <\/b><\/span><\/span><\/span>em <\/b><\/span><\/span><\/span>ambos os casos<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

A) <\/b><\/span><\/span><\/span>0,4 e 0,<\/b><\/span><\/span><\/span>16 B) <\/b><\/span><\/span><\/span>0,4 e 6,25 <\/b><\/span><\/span><\/span>C) <\/b><\/span><\/span><\/span>2,5 e 0,16 <\/b><\/span><\/span><\/span>D) <\/b><\/span><\/span><\/span>2,5 e 6,25<\/b><\/span><\/span><\/span><\/p>\n

Resolu\u00e7\u00e3o comentada das quest\u00f5es de F\u00edsica da PUC-SP \u2013 019<\/span><\/span><\/span><\/p>\n

01-<\/span><\/span><\/span><\/p>\n

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Bola 2<\/b><\/span><\/span><\/span><\/p>\n

O mesmo \u00e9 v\u00e1lido para a bola 2 s\u00f3 que agora E<\/b><\/span><\/span><\/span>pa<\/b><\/span><\/span><\/sub><\/span> = 0,95%E<\/b><\/span><\/span><\/span>pd<\/b><\/span><\/span><\/sub><\/span> <\/b><\/span><\/span><\/span>m<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>gH = 0,95m<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>.gh<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> <\/b><\/span><\/span><\/span> <\/b>h<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> = 0,95H.<\/b><\/span><\/span><\/span><\/p>\n

Como \u00e9 <\/b><\/span><\/span><\/span>pedida a diferen\u00e7a h<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> \u2013 h<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> voc\u00ea ter\u00e1 <\/b><\/span><\/span><\/span> <\/b>h<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> \u2013 h<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> <\/b>= 0,95H \u2013 0,75H <\/b><\/span><\/span><\/span>= 0,20H <\/b><\/span><\/span><\/span><\/p>\n

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

02-<\/span><\/span><\/span><\/p>\n

C\u00e2mara escura de orif\u00edcio<\/b><\/span><\/span><\/span><\/span><\/p>\n

Trata-se do\u00a0<\/b><\/span><\/span>princ\u00edpio de funcionamento de uma m\u00e1quina fotogr\u00e1fica\u00a0<\/b><\/span><\/span>baseado n <\/b><\/span><\/span>propaga\u00e7\u00e3o retil\u00ednea da luz.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Todos os\u00a0<\/b><\/span><\/span>infinitos raios de luz que s\u00e3o emitidos pelo objeto\u00a0<\/b><\/span><\/span>a ser projetado,\u00a0<\/b><\/span><\/span>passam atrav\u00e9s de um pequeno orif\u00edcio e atingem a parte interior oposta da c\u00e2mara. .<\/b><\/span><\/span><\/span><\/span><\/p>\n

Com isso a\u00a0<\/b><\/span><\/span>luz que sai do ponto (A) superior do objeto (no nosso exemplo, borboleta)<\/b><\/span><\/span>atingir\u00e1 a\u00a0<\/b><\/span><\/span>parede oposta no ponto inferior (A\u2019) da imagem projetada<\/b><\/span><\/span>, formando uma<\/b><\/span><\/span>imagem invertida<\/b><\/span><\/span>, conforme a figura.<\/b><\/span><\/span><\/span><\/span><\/p>\n

O mesmo acontece\u00a0<\/b><\/span><\/span>nas partes laterais<\/b><\/span><\/span>, trocando a\u00a0<\/b><\/span><\/span>direita pela esquerda (imagem reversa).<\/b><\/span><\/span><\/span><\/span><\/p>\n


\n<\/b><\/span><\/span>Semelhan\u00e7a de tri\u00e2ngulos\u00a0\u00a0\u00a0i\/o = d\/D\u00a0\u00a0<\/b><\/span><\/span>\u00a0 observe que\u00a0<\/b><\/span><\/span>objeto e imagem trocam cima por baixo (invertida) e direita pela esquerda (reversa).\u00a0 \u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

Se o\u00a0<\/b><\/span><\/span>orif\u00edcio da c\u00e2mara for aumentado a nitidez da imagem diminui e sua luminosidade aumenta.<\/b><\/span><\/span><\/span><\/span><\/p>\n

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

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

Eletriza\u00e7\u00e3o por contato<\/b><\/span><\/span><\/span><\/span><\/p>\n

Pode ocorrer<\/b><\/span><\/span>\u00a0entre\u00a0<\/b><\/span><\/span>dois condutores<\/b><\/span><\/span>\u00a0(cargas el\u00e9tricas se distribuem em suas superf\u00edcie externas) ou entre um\u00a0<\/b><\/span><\/span>condutor e um isolante<\/b><\/span><\/span>\u00a0(no isolante as cargas el\u00e9tricas ficam somente no local do contato).<\/b><\/span><\/span><\/span><\/span><\/p>\n

Considere\u00a0<\/b><\/span><\/span>um condutor A eletrizado com carga positiva (Q<\/b><\/span><\/span>A<\/b><\/span><\/sub><\/span>\u00a0= + Q)<\/b><\/span><\/span>\u00a0e outro\u00a0<\/b><\/span><\/span>condutor B,
\n<\/b><\/span><\/span>eletricamente\u00a0<\/b><\/span><\/span>neutro<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>(Q<\/b><\/span><\/span>B<\/b><\/span><\/sub><\/span>\u00a0= 0)<\/b><\/span><\/span>\u00a0presos a\u00a0<\/b><\/span><\/span>suportes isolantes<\/b><\/span><\/span>\u00a0(para que n\u00e3o descarreguem),<\/b><\/span><\/span>inicialmente<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>separados.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Quando s\u00e3o\u00a0<\/b><\/span><\/span>colocados em contato<\/b><\/span><\/span>, os dois se comportam como se fossem\u00a0<\/b><\/span><\/span>um \u00fanico corpo e haver\u00e1 uma distribui\u00e7\u00e3o de cargas nas superf\u00edcies de A e de B.<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

Ap\u00f3s essa distribui\u00e7\u00e3o de cargas\u00a0<\/b><\/span><\/span>s\u00e3o separados e A ficar\u00e1 com carga QA\u2019\u00a0e B com carga QB\u2019<\/b><\/span><\/span>, tal que\u00a0<\/b><\/span><\/span>QA\u2019\u00a0+ QB\u2019 = + Q (princ\u00edpio da conserva\u00e7\u00e3o das cargas el\u00e9tricas).<\/b><\/span><\/span><\/span><\/span><\/p>\n

Observe que, se\u00a0<\/b><\/span><\/span>os\u00a0condutores forem id\u00eanticos<\/b><\/span><\/span>\u00a0e com as\u00a0<\/b><\/span><\/span>mesmas dimens\u00f5es<\/b><\/span><\/span>, voc\u00ea teria\u00a0<\/b><\/span><\/span>QA\u2019 = QB\u2019= Q\u2019\u00a0<\/b><\/span><\/span>\u00a0Q\u2019 + Q\u2019 = + Q\u00a0\u00a0<\/b><\/span><\/span>Q\u2019=Q\/2<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

Se os dois corpos\u00a0<\/b><\/span><\/span>forem\u00a0id\u00eanticos<\/b><\/span><\/span>\u00a0e estiverem\u00a0<\/b><\/span><\/span>inicialmente eletrizados com cargas\u00a0Q<\/b><\/span><\/span>A<\/b><\/span><\/sub><\/span>\u00a0e Q<\/b><\/span><\/span>B<\/b><\/span><\/sub><\/span>,<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>ap\u00f3s\u00a0<\/b><\/span><\/span>o contato eles ter\u00e3o cargas id\u00eanticas Q\u2019 tal que\u00a0<\/b><\/span><\/span>Q\u2019= (Q<\/b><\/span><\/span>A<\/b><\/span><\/sub><\/span>\u00a0+ Q<\/b><\/span><\/span>B<\/b><\/span><\/sub><\/span>)\/2.<\/b><\/span><\/span><\/span><\/span><\/p>\n

No caso do exerc\u00edcio:<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

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

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

A) Correta <\/b><\/span><\/span><\/span>– A <\/b><\/span><\/span><\/span>for\u00e7a resultante \u00e9 a for\u00e7a centr\u00edpeta (F<\/b><\/span><\/span><\/span>c<\/b><\/span><\/span><\/sub><\/span>) <\/b><\/span><\/span><\/span>de <\/b><\/span><\/span><\/span>dire\u00e7\u00e3o radial e sentido para o centro da<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

circunfer\u00eancia <\/b><\/span><\/span><\/span>e, no caso, <\/b><\/span><\/span><\/span>\u00e9 apenas a parcela horizontal de T (T<\/b><\/span><\/span><\/span>x<\/b><\/span><\/span><\/sub><\/span>) que n\u00e3o produz rota\u00e7\u00e3o, <\/b><\/span><\/span><\/span>que \u00e9 <\/b><\/span><\/span><\/span>produzida apena pela parcela vertical de T (T<\/b><\/span><\/span><\/span>y<\/b><\/span><\/span><\/sub><\/span>). <\/b><\/span><\/span><\/span>Assim, <\/b><\/span><\/span><\/span>o momento gerado pela for\u00e7a resultante (for\u00e7a centr\u00edpeta) \u00e9 nulo. <\/b><\/span><\/span><\/span><\/p>\n

B) Falsa <\/b><\/span><\/span><\/span>\u2013 a <\/b><\/span><\/span><\/span>quantidade de movimento possui m\u00f3dulo Q = m.V constante. <\/b><\/span><\/span><\/span>Mas sua <\/b><\/span><\/span><\/span>dire\u00e7\u00e3o e sentido muda de acordo com a velocidade que \u00e9 tangente \u00e0 trajet\u00f3ria em cada ponto.<\/b><\/span><\/span><\/span><\/p>\n

C) Falsa <\/b><\/span><\/span><\/span>\u2013 veja (A)<\/b><\/span><\/span><\/span><\/p>\n

D) Falsa <\/b><\/span><\/span><\/span>\u2013 veja (A)<\/b><\/span><\/span><\/span><\/p>\n

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

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

Velocidade m\u00e9dia num MUV<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

extremos de dois intervalos de tempo quaisquer<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

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

06-<\/span><\/span><\/span><\/p>\n

<\/p>\n

<\/p>\n

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

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

Se voc\u00ea n\u00e3o domina a teoria ela est\u00e1 a seguir:<\/b><\/span><\/span><\/span><\/p>\n

Associa\u00e7\u00e3o de molas<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

Duas molas\u00a0<\/b><\/span><\/span>1 e 2<\/b><\/span><\/span>\u00a0tem\u00a0<\/b><\/span><\/span>constantes el\u00e1sticas k1\u00a0e k2,<\/b><\/span><\/span>\u00a0respectivamente.<\/b><\/span><\/span>\u00a0Podemos\u00a0<\/b><\/span><\/span>associ\u00e1-las em s\u00e9rie<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>ou em paralelo<\/b><\/span><\/span>. Em\u00a0<\/b><\/span><\/span>cada uma<\/b><\/span><\/span>\u00a0dessas associa\u00e7\u00f5es podemos <\/b><\/span><\/span>substituir as duas molas<\/b><\/span><\/span>\u00a0por uma \u00fanica, que produza o\u00a0<\/b><\/span><\/span>mesmo efeito<\/b><\/span><\/span>\u00a0e que chamamos de\u00a0<\/b><\/span><\/span>mola equivalente de constante el\u00e1stica<\/b><\/span><\/span>\u00a0ke.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Associa\u00e7\u00e3o em paralelo<\/b><\/span><\/span><\/span><\/span><\/p>\n

Nesse caso a\u00a0<\/b><\/span><\/span>deforma\u00e7\u00e3o\u00a0x<\/b><\/span><\/span>\u00a0sofrida por\u00a0<\/b><\/span><\/span>cada uma das molas \u00e9 a mesma.<\/b><\/span><\/span><\/span><\/span><\/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<\/span><\/p>\n

Quando\u00a0<\/b><\/span><\/span>deformadas de\u00a0<\/b><\/span><\/span>x<\/b><\/span><\/span>, a mola 1 fica sujeita a uma for\u00e7a\u00a0<\/b><\/span><\/span>F1\u00a0= k1.x<\/b><\/span><\/span>\u00a0e a mola 2 a uma for\u00e7a\u00a0<\/b><\/span><\/span>F2\u00a0= k2.x<\/b><\/span><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

A\u00a0<\/b><\/span><\/span>mola equivalente<\/b><\/span><\/span>, quando submetida \u00e0\u00a0<\/b><\/span><\/span>mesma for\u00e7a F,<\/b><\/span><\/span>\u00a0sofre a\u00a0<\/b><\/span><\/span>mesma deforma\u00e7\u00e3o x<\/b><\/span><\/span>\u00a0de modo que\u00a0<\/b><\/span><\/span>F = ke.x.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Observe que\u00a0<\/b><\/span><\/span>F = F1\u00a0+ F2<\/b><\/span><\/span>\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span>ke.x = k1.x + k2.x<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>ke\u00a0= k1\u00a0+ k2.<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

Se voc\u00ea tiver\u00a0<\/b><\/span><\/span>n\u00a0<\/b><\/span><\/span>molas<\/b><\/span><\/span>\u00a0\u00a0\u00a0<\/b><\/span><\/span>Ke\u00a0= K1\u00a0+ K2\u00a0+ K3\u00a0+ \u2026. Kn.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Associa\u00e7\u00e3o em s\u00e9rie<\/b><\/span><\/span><\/span><\/span><\/p>\n

Nesse caso as\u00a0<\/b><\/span><\/span>molas 1 e 2 est\u00e3o sujeitas \u00e0 mesma for\u00e7a F<\/b><\/span><\/span>\u00a0e\u00a0<\/b><\/span><\/span>sofrem deforma\u00e7\u00f5es diferentes<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>x1\u00a0e x2.<\/b><\/span><\/span><\/span><\/span><\/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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/p>\n

Se voc\u00ea tiver\u00a0<\/b><\/span><\/span>n\u00a0<\/b><\/span><\/span>molas<\/b><\/span><\/span>\u00a0\u00a0<\/b><\/span><\/span>1<\/b><\/span><\/span>\/<\/b><\/span><\/span>Ke\u00a0= 1\/K1\u00a0+ 1\/K2\u00a0+ 1\/K3\u00a0+ \u2026. 1\/Kn.<\/b><\/span><\/span><\/span><\/span><\/p>\n

No caso do exerc\u00edcio:<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

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

<\/p>\n

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

\n

 <\/p>\n

Clique aqui para ver sobre o tema!<\/a><\/p>\n

Confira as v\u00eddeo aulas!<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

  A\u00a0Pontif\u00edcia Universidade Cat\u00f3lica de S\u00e3o Paulo\u00a0(PUC-SP) \u00e9 uma\u00a0institui\u00e7\u00e3o de ensino superior privada\u00a0e\u00a0cat\u00f3lica\u00a0brasileira. \u00c9 mantida pela Funda\u00e7\u00e3o S\u00e3o Paulo (FUNDASP), presidida pelo Gr\u00e3o-Chanceler da Universidade e vinculada \u00e0\u00a0Mitra Arquidiocesana da cidade de S\u00e3o Paulo.\u00a0Suas unidades de ensino est\u00e3o distribu\u00eddas em cinco\u00a0campi\u00a0universit\u00e1rios, sendo quatro localizados na\u00a0capital do Estado de S\u00e3o Paulo: Monte Alegre, Marqu\u00eas de Paranagu\u00e1, Ipiranga e Santana, e um<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":4337,"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-4675","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4675","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=4675"}],"version-history":[{"count":3,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4675\/revisions"}],"predecessor-version":[{"id":10266,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4675\/revisions\/10266"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4337"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=4675"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}