{"id":4862,"date":"2020-01-10T03:05:25","date_gmt":"2020-01-10T03:05:25","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=4862"},"modified":"2024-06-29T23:32:17","modified_gmt":"2024-06-29T23:32:17","slug":"cinematica-2018-2019","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/vestibulares-recentes\/mecanica\/cinematica-2018-2019\/","title":{"rendered":"Cinem\u00e1tica 2018\/2019"},"content":{"rendered":"

Cinem\u00e1tica 2018\/2019<\/b><\/span><\/span><\/span><\/p>\n

01 \u2013 (ENEM-MEC-018)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

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02-(ENEM-MEC-017)<\/span><\/span><\/span><\/p>\n

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03-(ENEM-MEC-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

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04-(ENEM-MEC-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

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Em um\u00a0<\/b><\/span><\/span>telef\u00e9rico tur\u00edstico,<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>bondinhos saem de esta\u00e7\u00f5es ao n\u00edvel do mar<\/b><\/span><\/span>\u00a0e do\u00a0<\/b><\/span><\/span>topo de uma montanha.\u00a0<\/b><\/span><\/span>A\u00a0<\/b><\/span><\/span>travessia dura 1,5 minuto\u00a0<\/b><\/span><\/span>e\u00a0<\/b><\/span><\/span>ambos os bondinhos se deslocam \u00e0 mesma velocidade.<\/b><\/span><\/span><\/span><\/span><\/p>\n

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Quarenta segundos ap\u00f3s o bondinho A partir da esta\u00e7\u00e3o ao n\u00edvel do mar,<\/b><\/span><\/span>\u00a0ele\u00a0<\/b><\/span><\/span>cruza com o bondinho B, que havia sa\u00eddo do topo da montanha.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Quantos segundos ap\u00f3s a partida do bondinho B partiu o bondinho A?<\/b><\/span><\/span><\/span><\/span><\/p>\n

(a)\u00a0<\/b><\/span><\/span>5.\u00a0<\/b><\/span><\/span>(b)\u00a0<\/b><\/span><\/span>10.\u00a0<\/b><\/span><\/span>(c)\u00a0<\/b><\/span><\/span>15.\u00a0<\/b><\/span><\/span>(d)\u00a0<\/b><\/span><\/span>20.\u00a0<\/b><\/span><\/span>(e)\u00a0<\/b><\/span><\/span>25<\/b><\/span><\/span><\/span><\/span><\/p>\n

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05-(ENEM-MEC-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

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Durante um\u00a0<\/b><\/span><\/span>passeio<\/b><\/span><\/span>\u00a0em uma\u00a0<\/b><\/span><\/span>bicicleta desse tipo, deseja-se\u00a0<\/b><\/span><\/span>fazer um\u00a0<\/b><\/span><\/span>percurso o mais devagar poss\u00edvel,\u00a0<\/b><\/span><\/span>escolhendo,\u00a0<\/b><\/span><\/span>para isso, uma das seguintes combina\u00e7\u00f5es de engrenagens (coroa x catraca):<\/b><\/span><\/span><\/span><\/span><\/p>\n

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A\u00a0<\/b><\/span><\/span>combina\u00e7\u00e3o escolhida para realizar esse passeio da forma desejada\u00a0<\/b><\/span><\/span>\u00e9<\/b><\/span><\/span><\/span><\/span><\/p>\n

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06-(ENEM-MEC-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

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07- (Faculdade de Ci\u00eancias M\u00e9dicas da Santa Casa de S\u00e3o Paulo \u2013 SP \u2013 019)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

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08- (Faculdade de Ci\u00eancias M\u00e9dicas da Santa Casa de S\u00e3o Paulo \u2013 SP \u2013 019)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

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09-<\/span><\/span><\/span>(Faculdade de Ci\u00eancias M\u00e9dicas da Santa Casa de S\u00e3o Paulo \u2013 018)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

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10-Insper \u2013 SP \u2013 2019<\/b><\/span><\/span><\/span><\/p>\n

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A figura mostra uma r\u00e9plica do Benz Patent Motorwagen, de 1885, carro de dois lugares e tr\u00eas rodas. O\u00a0<\/b><\/span><\/span><\/span>di\u00e2metro da roda dianteira mede 60 cm, e o das rodas traseiras mede 80 cm<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

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Em um teste rec\u00e9m-realizado, o ve\u00edculo\u00a0<\/b><\/span><\/span><\/span>percorreu<\/b><\/span><\/span><\/span>, em linha reta,\u00a0<\/b><\/span><\/span><\/span>7,2 km em 12 minutos<\/b><\/span><\/span><\/span>, mantendo sua\u00a0<\/b><\/span><\/span><\/span>velocidade praticamente constante<\/b><\/span><\/span><\/span>. Assim, considerando\u00a0<\/b><\/span><\/span><\/span>\u03c0 = 3<\/b><\/span><\/span><\/span>, a\u00a0<\/b><\/span><\/span><\/span>frequ\u00eancia de giro das rodas dianteira e traseiras deve ter sido<\/b><\/span><\/span><\/span>, em\u00a0<\/b><\/span><\/span><\/span>Hz<\/b><\/span><\/span><\/span>, aproximada e respectivamente, de<\/b><\/span><\/span><\/span><\/p>\n

(A) 5,5 e 4,2.<\/b><\/span><\/span><\/span><\/p>\n

(B) 5,5 e 4,4.<\/b><\/span><\/span><\/span><\/p>\n

(C) 5,6 e 4,2.<\/b><\/span><\/span><\/span><\/p>\n

(D) 5,6 e 4,4.<\/b><\/span><\/span><\/span><\/p>\n

(E) 5,8 e 4,5.<\/b><\/span><\/span><\/span><\/p>\n

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

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Duas bolas s\u00e3o abandonadas simultaneamente de uma mesma altura,<\/b><\/span><\/span><\/span>\u00a0conforme\u00a0<\/b><\/span><\/span><\/span>representado na figura.<\/b><\/span><\/span><\/span><\/p>\n

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A\u00a0<\/b><\/span><\/span><\/span>massa da bola 1 \u00e9 de 600g\u00a0<\/b><\/span><\/span><\/span>e a\u00a0<\/b><\/span><\/span><\/span>da bola 2 \u00e9 de 250g.\u00a0<\/b><\/span><\/span><\/span>Como\u00a0<\/b><\/span><\/span><\/span>possuem materiais diferentes,<\/b><\/span><\/span><\/span>\u00a0ao\u00a0<\/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,\u00a0<\/b><\/span><\/span><\/span>a<\/b><\/span><\/span><\/span><\/p>\n

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diferen\u00e7a entre as alturas m\u00e1ximas alcan\u00e7adas por essas bolas, ap\u00f3s colidirem com o solo.\u00a0<\/b><\/span><\/span><\/span>Adote\u00a0<\/b><\/span><\/span><\/span>como refer\u00eancia as bases das bolas e considere g = 10m\/s\u00b2.<\/b><\/span><\/span><\/span><\/p>\n

A)\u00a0<\/b><\/span><\/span><\/span>0,20H\u00a0<\/b><\/span><\/span><\/span>B)\u00a0<\/b><\/span><\/span><\/span>0,25H\u00a0<\/b><\/span><\/span><\/span>C)\u00a0<\/b><\/span><\/span><\/span>0,50H\u00a0<\/b><\/span><\/span><\/span>D)\u00a0<\/b><\/span><\/span><\/span>0,75H<\/b><\/span><\/span><\/span><\/p>\n

12-<\/b><\/span><\/span><\/span>(Faculdade de Tecnologia Termomec\u00e2nica \u2013 SP- 019)<\/b><\/span><\/span><\/span><\/p>\n

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Observe\u00a0<\/b><\/span><\/span><\/span>a figura, onde se destaca uma placa de fiscaliza\u00e7\u00e3o eletr\u00f4nica de velocidade.<\/b><\/span><\/span><\/span><\/p>\n

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No\u00a0<\/b><\/span><\/span><\/span>Sistema Internacional de Unidades,\u00a0<\/b><\/span><\/span><\/span>os\u00a0<\/b><\/span><\/span><\/span>valores indicados na placa est\u00e3o compreendidos no intervalo de<\/b><\/span><\/span><\/span><\/p>\n

(A)\u00a0<\/b><\/span><\/span><\/span>15 m\/s a 25 m\/s.<\/b><\/span><\/span><\/span><\/p>\n

(B)\u00a0<\/b><\/span><\/span><\/span>18 m\/s a 22 m\/s.<\/b><\/span><\/span><\/span><\/p>\n

(C)\u00a0<\/b><\/span><\/span><\/span>10 m\/s a 20 m\/s.<\/b><\/span><\/span><\/span><\/p>\n

(D)\u00a0<\/b><\/span><\/span><\/span>18 m\/s a 32 m\/s.<\/b><\/span><\/span><\/span><\/p>\n

(E)\u00a0<\/b><\/span><\/span><\/span>20 m\/s a 50 m\/s.<\/b><\/span><\/span><\/span><\/p>\n

13-<\/b><\/span><\/span><\/span>(Faculdade de Tecnologia Termomec\u00e2nica \u2013 SP- 019)<\/b><\/span><\/span><\/span><\/p>\n

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O\u00a0<\/b><\/span><\/span><\/span>gr\u00e1fico representa a varia\u00e7\u00e3o da velocidade escalar de um m\u00f3vel em fun\u00e7\u00e3o do tempo,<\/b><\/span><\/span><\/span>\u00a0sendo\u00a0<\/b><\/span><\/span><\/span>t1\u00a0o instante em que a reta intercepta o eixo do tempo.<\/b><\/span><\/span><\/span><\/p>\n

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A\u00a0<\/b><\/span><\/span><\/span>alternativa que representa corretamente o gr\u00e1fico da acelera\u00e7\u00e3o escalar desse m\u00f3vel,\u00a0<\/b><\/span><\/span><\/span>tamb\u00e9m\u00a0<\/b><\/span><\/span><\/span>em fun\u00e7\u00e3o do tempo,\u00a0<\/b><\/span><\/span><\/span>\u00e9:<\/b><\/span><\/span><\/span><\/p>\n

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14-<\/span><\/span><\/span>(Faculdade de Tecnologia Termomec\u00e2nica \u2013 SP- 019)<\/b><\/span><\/span><\/span><\/p>\n

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Considere o\u00a0<\/b><\/span><\/span><\/span>patinador da figura lan\u00e7ando-se horizontalmente sobre uma superf\u00edcie de gelo sem atrito, inicialmente a 40 metros de altitude e com velocidade 20 m\/s,\u00a0<\/b><\/span><\/span><\/span>como mostra a\u00a0<\/b><\/span><\/span><\/span>figura.<\/b><\/span><\/span><\/span><\/p>\n

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A\u00a0<\/b><\/span><\/span><\/span>acelera\u00e7\u00e3o da gravidade \u00e9 igual a 10 m\/s2<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>e\u00a0<\/b><\/span><\/span><\/span>n\u00e3o h\u00e1 dissipa\u00e7\u00e3o de energia mec\u00e2nica<\/b><\/span><\/span><\/span>\u00a0em todo o movimento do patinador,\u00a0<\/b><\/span><\/span><\/span>considerado como um ponto material.<\/b><\/span><\/span><\/span>\u00a0Sabendo que\u00a0<\/b><\/span><\/span><\/span>ele atinge o declive a 15 metros de altitude, a alternativa que indica corretamente sua velocidade, nesse instante,\u00a0<\/b><\/span><\/span><\/span>\u00e9<\/b><\/span><\/span><\/span><\/p>\n

(A)\u00a0<\/b><\/span><\/span><\/span>25 m\/s.\u00a0<\/b><\/span><\/span><\/span>(B)\u00a0<\/b><\/span><\/span><\/span>30 m\/s.\u00a0<\/b><\/span><\/span><\/span>(C)\u00a0<\/b><\/span><\/span><\/span>35 m\/s.\u00a0<\/b><\/span><\/span><\/span>(D)\u00a0<\/b><\/span><\/span><\/span>40 m\/s.\u00a0<\/b><\/span><\/span><\/span>(E)\u00a0<\/b><\/span><\/span><\/span>45 m\/s.<\/b><\/span><\/span><\/span><\/p>\n

15-<\/b><\/span><\/span><\/span>(MEDICINA \u2013 UNIVERSIDADE MUNICIPAL DE S\u00c3O CAETANO DO SUL \u2013\u2013 USCS-SP \u2013 019)<\/b><\/span><\/span><\/span><\/p>\n

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Ao\u00a0<\/b><\/span><\/span><\/span>consultar um aplicativo de tr\u00e2nsito,\u00a0<\/b><\/span><\/span><\/span>uma pessoa\u00a0<\/b><\/span><\/span><\/span>foi informada de que a dist\u00e2ncia entre S\u00e3o Caetano do Sul e S\u00e3o Jos\u00e9 dos Campos \u00e9 98 km<\/b><\/span><\/span><\/span>\u00a0e que a\u00a0<\/b><\/span><\/span><\/span>viagem entre as duas cidades demoraria 1 hora e 24 minutos.<\/b><\/span><\/span><\/span><\/p>\n

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Para\u00a0<\/b><\/span><\/span><\/span>determinar esse tempo, o aplicativo considerou que a velocidade escalar m\u00e9dia desenvolvida pelo ve\u00edculo no trajeto entre as duas cidades seria\u00a0<\/b><\/span><\/span><\/span>de<\/b><\/span><\/span><\/span><\/p>\n

(A)\u00a0<\/b><\/span><\/span><\/span>70 km\/h.\u00a0<\/b><\/span><\/span><\/span>(B)\u00a0<\/b><\/span><\/span><\/span>60 km\/h.\u00a0<\/b><\/span><\/span><\/span>(C)\u00a0<\/b><\/span><\/span><\/span>65 km\/h.\u00a0<\/b><\/span><\/span><\/span>(D)\u00a0<\/b><\/span><\/span><\/span>75 km\/h.\u00a0<\/b><\/span><\/span><\/span>(E)\u00a0<\/b><\/span><\/span><\/span>80 km\/h<\/b><\/span><\/span><\/span><\/p>\n

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16-<\/b><\/span><\/span><\/span>(FMABC-SP-018)<\/b><\/span><\/span><\/span><\/p>\n

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17-<\/span><\/span><\/span>(Faculdade de Tecnologia do Estado de S\u00e3o Paulo\u00a0\u2013 FATEC \u2013 019)<\/b><\/span><\/span><\/span><\/p>\n

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A\u00a0<\/b><\/span><\/span><\/span>linha 1 (Azul) do metr\u00f4 de S\u00e3o Paulo foi inaugurada em setembro de 1974\u00a0<\/b><\/span><\/span><\/span>e<\/b><\/span><\/span><\/span>\u00a0opera hoje com uma extens\u00e3o aproximada de 21000 metros distribu\u00eddos por 23 esta\u00e7\u00f5es, da esta\u00e7\u00e3o Jabaquara \u00e0 esta\u00e7\u00e3o Tucuruvi.<\/b><\/span><\/span><\/span><\/p>\n

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O\u00a0<\/b><\/span><\/span><\/span>tempo m\u00e9dio, para percorrer o trajeto entre as duas esta\u00e7\u00f5es terminais citadas<\/b><\/span><\/span><\/span>, \u00e9 de,\u00a0<\/b><\/span><\/span><\/span>aproximadamente, 45 minutos.<\/b><\/span><\/span><\/span><\/p>\n

Se\u00a0<\/b><\/span><\/span><\/span>um passageiro entra no vag\u00e3o de um trem (metr\u00f4) na esta\u00e7\u00e3o Jabaquara e desce apenas na esta\u00e7\u00e3o Tucuruvi, podemos afirmar corretamente que a sua velocidade escalar m\u00e9dia<\/b><\/span><\/span><\/span>, em\u00a0<\/b><\/span><\/span><\/span>km\/h<\/b><\/span><\/span><\/span>, \u00e9,\u00a0<\/b><\/span><\/span><\/span>mais pr\u00f3xima\u00a0<\/b><\/span><\/span><\/span>de<\/b><\/span><\/span><\/span><\/p>\n

(A)\u00a0<\/b><\/span><\/span><\/span>20.\u00a0<\/b><\/span><\/span><\/span>(B)\u00a0<\/b><\/span><\/span><\/span>30<\/b><\/span><\/span><\/span>. (C)\u00a0<\/b><\/span><\/span><\/span>40.\u00a0<\/b><\/span><\/span><\/span>(D)\u00a0<\/b><\/span><\/span><\/span>50.\u00a0<\/b><\/span><\/span><\/span>(E)\u00a0<\/b><\/span><\/span><\/span>60.<\/b><\/span><\/span><\/span><\/p>\n

18-<\/span><\/span><\/span>(Universidade Virtual do Estado de S\u00e3o Paulo \u2013 Univesp \u2013 2019)<\/b><\/span><\/span><\/span><\/p>\n

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Uma\u00a0<\/b><\/span><\/span><\/span>estrada serrana possui dois t\u00faneis: UM e DOIS. A extens\u00e3o do t\u00fanel DOIS \u00e9 o qu\u00e1druplo da do t\u00fanel UM.<\/b><\/span><\/span><\/span><\/p>\n

Um\u00a0<\/b><\/span><\/span><\/span>carro A entra no t\u00fanel UM com uma velocidade V. Nesse exato instante, um outro carro B, com o dobro da velocidade de A, adentra o t\u00fanel DOIS.<\/b><\/span><\/span><\/span><\/p>\n

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Considerando que\u00a0<\/b><\/span><\/span><\/span>ambos mantiveram velocidades constantes em todo o trajeto, em rela\u00e7\u00e3o ao intervalo de tempo que cada carro demorou para percorrer toda a extens\u00e3o do t\u00fanel, podemos concluir corretamente que o intervalo de tempo do carro B<\/b><\/span><\/span><\/span>\u00a0\u00e9<\/b><\/span><\/span><\/span><\/p>\n

(A)\u00a0<\/b><\/span><\/span><\/span>o quadruplo do intervalo de tempo do carro A.<\/b><\/span><\/span><\/span><\/p>\n

(B)\u00a0<\/b><\/span><\/span><\/span>o dobro do intervalo de tempo do carro A.<\/b><\/span><\/span><\/span><\/p>\n

(C)\u00a0<\/b><\/span><\/span><\/span>igual ao intervalo de tempo do carro A.<\/b><\/span><\/span><\/span><\/p>\n

(D)\u00a0<\/b><\/span><\/span><\/span>a metade do intervalo de tempo do carro A.<\/b><\/span><\/span><\/span><\/p>\n

(E)\u00a0<\/b><\/span><\/span><\/span>um quarto do intervalo de tempo do carro A.<\/b><\/span><\/span><\/span><\/p>\n

19- (<\/span><\/span><\/span>UERJ-019)<\/b><\/span><\/span><\/span><\/p>\n

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Estima-se que um mosquito seja capaz de voar\u00a0<\/b><\/span><\/span><\/span>3,0 km por dia<\/b><\/span><\/span><\/span>, como informa o texto. Nessas<\/b><\/span><\/span><\/span><\/p>\n

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condi\u00e7\u00f5es, a\u00a0<\/b><\/span><\/span><\/span>velocidade m\u00e9dia<\/b><\/span><\/span><\/span>\u00a0do mosquito corresponde,\u00a0<\/b><\/span><\/span><\/span>em km\/h<\/b><\/span><\/span><\/span>, a:<\/b><\/span><\/span><\/span><\/p>\n

(A) 0,125<\/b><\/span><\/span><\/span><\/p>\n

(B) 0,250<\/b><\/span><\/span><\/span><\/p>\n

(C) 0,600<\/b><\/span><\/span><\/span><\/p>\n

(D) 0,800<\/b><\/span><\/span><\/span><\/p>\n

20- (<\/span><\/span>UERJ-019)<\/b><\/span><\/span><\/span><\/p>\n

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Em um equipamento industrial, duas engrenagens,\u00a0<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/span>\u00a0e\u00a0<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/span>, giram\u00a0<\/b><\/span><\/span><\/span>100 vezes por segundo<\/b><\/span><\/span><\/span>\u00a0e\u00a0<\/b><\/span><\/span><\/span>6000 vezes<\/b><\/span><\/span><\/span><\/p>\n

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por minuto<\/b><\/span><\/span><\/span>, respectivamente. O\u00a0<\/b><\/span><\/span><\/span>per\u00edodo da engrenagem A<\/b><\/span><\/span><\/span>\u00a0equivale a\u00a0<\/b><\/span><\/span><\/span>TA<\/b><\/span><\/span><\/span>\u00a0e o da engrenagem\u00a0<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/span>, a\u00a0<\/b><\/span><\/span><\/span>TB<\/b><\/span><\/span><\/span>. A raz\u00e3o\u00a0<\/b><\/span><\/span><\/span>TA\/TB<\/b><\/span><\/span><\/span>\u00a0\u00e9 igual a:<\/b><\/span><\/span><\/span><\/p>\n

(A) 1\/6<\/b><\/span><\/span><\/span><\/p>\n

(B) 3\/5<\/b><\/span><\/span><\/span><\/p>\n

(C) 1<\/b><\/span><\/span><\/span><\/p>\n

(D) 6<\/b><\/span><\/span><\/span><\/p>\n

21-<\/span><\/span><\/span>(FGV-RJ-019)<\/b><\/span><\/span><\/span><\/p>\n

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22-<\/span><\/span><\/span>(CEDERJ-RJ-2019)<\/b><\/span><\/span><\/span><\/p>\n

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Dois m\u00f3veis executam curvas semicirculares,\u00a0mantendo os\u00a0m\u00f3dulos de suas velocidades constantes. Os\u00a0raios das curvas s\u00e3o distintos, por\u00e9m o tempo que cada m\u00f3vel gasta para execut\u00e1-las \u00e9 o mesmo.\u00a0Considerando que o\u00a0raio da curva efetuada pelo m\u00f3vel 1 \u00e9 o dobro do raio da<\/b><\/span><\/span><\/span><\/p>\n

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curva efetuada pelo m\u00f3vel 2, a\u00a0rela\u00e7\u00e3o entre as intensidades das for\u00e7as centr\u00edpetas F1\u00a0e F2\u00a0que atuam, respectivamente, sobre os m\u00f3veis 1 e 2 \u00e9:<\/b><\/span><\/span><\/span><\/p>\n

(A)\u00a0F1\u00a0= F2<\/b><\/span><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>(B)\u00a0F1\u00a0= F2<\/b><\/span><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>(C)\u00a0F1\u00a0= 2F2<\/b><\/span><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>(D)<\/b><\/span><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>F1\u00a0= 4F2<\/b><\/span><\/span><\/span><\/span><\/p>\n

23-<\/b><\/span><\/span><\/span>(CEDERJ-RJ-2019)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Um\u00a0<\/b><\/span><\/span>autom\u00f3vel, trafegando em linha reta\u00a0<\/b><\/span><\/span>com\u00a0<\/b><\/span><\/span>acelera\u00e7\u00e3o constante, aumenta a sua velocidade de<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

10 m\/s para 20 m\/s em 20 s<\/b><\/span><\/span>. A\u00a0<\/b><\/span><\/span>dist\u00e2ncia percorrida pelo autom\u00f3vel durante esses 20 s<\/b><\/span><\/span>\u00a0foi de:<\/b><\/span><\/span><\/span><\/span><\/p>\n

(A)\u00a0<\/b><\/span><\/span>200 m\u00a0<\/b><\/span><\/span>(B)\u00a0<\/b><\/span><\/span>300 m\u00a0<\/b><\/span><\/span>(C)\u00a0<\/b><\/span><\/span>400\u00a0<\/b><\/span><\/span>m\u00a0(D)\u00a0<\/b><\/span><\/span>600 m<\/b><\/span><\/span><\/span><\/span><\/p>\n

24-<\/b><\/span><\/span><\/span>(UDESC-SC-019)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Uma\u00a0<\/b><\/span><\/span>forma simples de medir o tempo de rea\u00e7\u00e3o de um indiv\u00edduo \u00e9 observar quanto tempo ele leva para fechar a m\u00e3o e segurar uma r\u00e9gua graduada em queda livre.<\/b><\/span><\/span>\u00a0A\u00a0<\/b><\/span><\/span>Figura 1 mostra duas imagens.<\/b><\/span><\/span>\u00a0Uma\u00a0<\/b><\/span><\/span>com a m\u00e3o aberta e uma r\u00e9gua graduada acima no momento em que ela \u00e9 solta.\u00a0<\/b><\/span><\/span>A outra\u00a0<\/b><\/span><\/span>imagem mostra o momento em que a r\u00e9gua \u00e9 segurada, registrando-se a dist\u00e2ncia\u00a0<\/b><\/span><\/span>h\u00a0<\/b><\/i><\/span><\/span>percorrida pela r\u00e9gua em queda livre.<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

Dois participante fizeram esse teste de rea\u00e7\u00e3o.\u00a0<\/b><\/span><\/span>O\u00a0<\/b><\/span><\/span>participante A registrou uma altura\u00a0<\/b><\/span><\/span>h\u00a0<\/b><\/i><\/span><\/span>e o\u00a0<\/b><\/span><\/span>participante B registrou\u00a0<\/b><\/span><\/span>h\/2<\/b><\/i><\/span><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Assinale<\/b><\/span><\/span>\u00a0a\u00a0<\/b><\/span><\/span>alternativa que corresponde \u00e0 raz\u00e3o entre os tempos de rea\u00e7\u00e3o t<\/b><\/span><\/span>A<\/b><\/span><\/span><\/span>\/t<\/b><\/span><\/span>B<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

25-<\/b><\/span><\/span><\/span>(UEMG-MG-019)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Ap\u00f3s\u00a0<\/b><\/span><\/span><\/span>estudar f\u00edsic<\/b><\/span><\/span><\/span>a exaustivamente para as provas de vestibular, L\u00edvia\u00a0<\/b><\/span><\/span><\/span>sentiu-se mal e precisou receber a visita de um m\u00e9dico.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Com base nas\u00a0<\/b><\/span><\/span><\/span>informa\u00e7\u00f5es do di\u00e1logo apresentado\u00a0<\/b><\/span><\/span><\/span>e considerando uma\u00a0<\/b><\/span><\/span><\/span>roda que gire em torno do seu pr\u00f3prio eixo com velocidade angular (\u03c9) constante,\u00a0<\/b><\/span><\/span><\/span>o\u00a0<\/b><\/span><\/span><\/span>per\u00edodo de rota\u00e7\u00e3o dessa roda\u00a0<\/b><\/span><\/span><\/span>\u00e9 dado por:<\/b><\/span><\/span><\/span><\/p>\n

A)\u00a0<\/b><\/span><\/span><\/span>2.(\u03c9.\u03c0)-1<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>B)\u00a0<\/b><\/span><\/span><\/span>2.\u03c0.\u03c9-1<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>C)\u00a0<\/b><\/span><\/span><\/span>\u03c9.2.\u03c0\u00a0<\/b><\/span><\/span><\/span>D)\u00a0<\/b><\/span><\/span><\/span>\u03c9.(2.\u03c0)-1<\/b><\/span><\/span><\/span><\/p>\n

26-<\/b><\/span><\/span><\/span>(UFAM-AM-2019)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>pai de Jo\u00e3o o leva de carro at\u00e9 a escola,\u00a0<\/b><\/span><\/span><\/span>sempre\u00a0<\/b><\/span><\/span><\/span>respeitando<\/b><\/span><\/span><\/span>\u00a0as\u00a0<\/b><\/span><\/span><\/span>leis de tr\u00e2nsito.\u00a0<\/b><\/span><\/span><\/span>Quando Jo\u00e3o ingressou no ensino m\u00e9dio e come\u00e7ou a ter\u00a0<\/b><\/span><\/span><\/span>aulas de F\u00edsica, afirmou,\u00a0<\/b><\/span><\/span><\/span>numa discuss\u00e3o com o pai,\u00a0<\/b><\/span><\/span><\/span>que se a velocidade m\u00e9dia do carro fosse tr\u00eas vezes maior, eles chegariam ao destino tr\u00eas vezes mais r\u00e1pido.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Para\u00a0<\/b><\/span><\/span><\/span>testar se o filho est\u00e1 correto, o pai foi com o carro para uma pista controlada\u00a0<\/b><\/span><\/span><\/span>e realizou os\u00a0<\/b><\/span><\/span><\/span>seguintes testes:<\/b><\/span><\/span><\/span><\/p>\n

(1)<\/b><\/span><\/span><\/span>\u00a0com o\u00a0<\/b><\/span><\/span><\/span>carro em movimento retil\u00edneo e uniforme, partiu do ponto A e chegou ao ponto B \u00e0s 11h30min.<\/b><\/span><\/span><\/span><\/p>\n

(2)\u00a0<\/b><\/span><\/span><\/span>ainda em\u00a0<\/b><\/span><\/span><\/span>movimento retil\u00edneo e uniforme e ajustando o hor\u00e1rio para a situa\u00e7\u00e3o anterior, triplicou a velocidade do carro e, partindo do ponto A, chegou ao ponto B \u00e0s 09h30min.<\/b><\/span><\/span><\/span><\/p>\n

Sejam as afirmativas:<\/b><\/span><\/span><\/span><\/p>\n

I.<\/b><\/span><\/span><\/span>\u00a0O carro\u00a0<\/b><\/span><\/span><\/span>saiu do ponto A as 8h30min.<\/b><\/span><\/span><\/span><\/p>\n

II. Partindo do ponto A na velocidade de 11m\/s e, depois, na velocidade de 33m\/s,\u00a0<\/b><\/span><\/span><\/span>\u00e9 poss\u00edvel concluir que a\u00a0<\/b><\/span><\/span><\/span>dist\u00e2ncia entre os pontos A e B \u00e9 de 118,8 km.<\/b><\/span><\/span><\/span><\/p>\n

III<\/b><\/span><\/span><\/span>. A\u00a0<\/b><\/span><\/span><\/span>velocidade em ambos os casos n\u00e3o foi constante.<\/b><\/span><\/span><\/span><\/p>\n

Assinale a\u00a0<\/b><\/span><\/span><\/span>alternativa correta:<\/b><\/span><\/span><\/span><\/p>\n

a)\u00a0<\/b><\/span><\/span><\/span>Somente a afirmativa I est\u00e1 correta.<\/b><\/span><\/span><\/span><\/p>\n

b)\u00a0<\/b><\/span><\/span><\/span>Somente a afirmativa II est\u00e1 correta.<\/b><\/span><\/span><\/span><\/p>\n

c)\u00a0<\/b><\/span><\/span><\/span>Somente a afirmativa III est\u00e1 correta.<\/b><\/span><\/span><\/span><\/p>\n

d)\u00a0<\/b><\/span><\/span><\/span>Somente as afirmativas I e II est\u00e3o corretas.<\/b><\/span><\/span><\/span><\/p>\n

e)\u00a0<\/b><\/span><\/span><\/span>Todas as afirmativas est\u00e3o corretas<\/b><\/span><\/span><\/span><\/p>\n

27-<\/b><\/span><\/span><\/span>(UFAM-AM-2019)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

<\/p>\n

28-<\/b><\/span><\/span><\/span>(UFT-TO \u2013 019)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

<\/p>\n

<\/p>\n

29-<\/span><\/span><\/span>(Instituto Federal de Educa\u00e7\u00e3o, Ci\u00eancia e Tecnologia<\/a>\u00a0de\u00a0Roraima<\/a>\u00a0\u2013 RR \u2013 019)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Dois m\u00f3veis, A e B,<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>percorrem<\/b><\/span><\/span><\/span>\u00a0uma\u00a0<\/b><\/span><\/span><\/span>mesma trajet\u00f3ria retil\u00ednea,\u00a0<\/b><\/span><\/span><\/span>de acordo com as\u00a0<\/b><\/span><\/span><\/span>equa\u00e7\u00f5es hor\u00e1rias:<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

SA\u00a0= 40 + 20t e SB\u00a0= 120 \u2013 10t, em unidades do SI.<\/b><\/span><\/span><\/span><\/p>\n

No\u00a0<\/b><\/span><\/span><\/span>instante t = 0 s, a dist\u00e2ncia entre eles\u00a0<\/b><\/span><\/span><\/span>era:<\/b><\/span><\/span><\/span><\/p>\n

(A)\u00a0<\/b><\/span><\/span><\/span>40 m\u00a0<\/b><\/span><\/span><\/span>(B)\u00a0<\/b><\/span><\/span><\/span>70 m\u00a0<\/b><\/span><\/span><\/span>(C)\u00a0<\/b><\/span><\/span><\/span>80 m\u00a0<\/b><\/span><\/span><\/span>(D)\u00a0<\/b><\/span><\/span><\/span>50 m\u00a0<\/b><\/span><\/span><\/span>(E)\u00a0<\/b><\/span><\/span><\/span>10 m<\/b><\/span><\/span><\/span><\/p>\n

30-<\/span><\/span><\/span>(URCA-CE-019)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>exerc\u00edcio f\u00edsico como caminhadas, corridas s\u00e3o muito recomendados pelos m\u00e9dicos para uma vida mais saud\u00e1vel.<\/b><\/span><\/span><\/span>\u00a0Examinando um\u00a0<\/b><\/span><\/span><\/span>pouco de f\u00edsica por tr\u00e1s deste esporte\u00a0<\/b><\/span><\/span><\/span>os autores de livros did\u00e1ticos de f\u00edsica, Ant\u00f4nio M\u00e1ximo e Beatriz Alvarenga,\u00a0<\/b><\/span><\/span><\/span>formularam o seguinte problema: observe o gr\u00e1fico abaixo que mostra informa\u00e7\u00f5es sobre o movimento de dois atletas (atleta A e atleta B).<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

No\u00a0<\/b><\/span><\/span><\/span>tempo t = 0\u00a0<\/b><\/span><\/span><\/span>os\u00a0<\/b><\/span><\/span><\/span>atletas encontram-se um ao lado do outro, na mesma posi\u00e7\u00e3o da pista de corrida.<\/b><\/span><\/span><\/span><\/p>\n

Escolha a alternativa que\u00a0n\u00e3o representa corretamente o movimento.<\/b><\/span><\/span><\/span><\/p>\n

A)\u00a0<\/b><\/span><\/span><\/span>Em t = 0, A encontra-se em repouso e B passa por ele com uma velocidade de 2 m\/s;<\/b><\/span><\/span><\/span><\/p>\n

B)\u00a0<\/b><\/span><\/span><\/span>Os atletas se descolam em movimento uniformemente acelerado;<\/b><\/span><\/span><\/span><\/p>\n

C)\u00a0<\/b><\/span><\/span><\/span>A acelera\u00e7\u00e3o de A \u00e9 0,4 m\/s2\u00a0e a do atleta B \u00e9 0,2 m\/s2\u00a0;<\/b><\/span><\/span><\/span><\/p>\n

D)\u00a0<\/b><\/span><\/span><\/span>De t = 0 at\u00e9 t = 5s, as dist\u00e2ncias percorridas por A e B respectivamente s\u00e3o de 5,0 m e 12,5 m;<\/b><\/span><\/span><\/span><\/p>\n

E)\u00a0<\/b><\/span><\/span><\/span>O atleta A alcan\u00e7a o atleta B no instante t = 10 s.<\/b><\/span><\/span><\/span><\/p>\n

31-<\/span><\/span><\/span>(UECE-CE-019)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Em\u00a0<\/b><\/span><\/span><\/span>antigos rel\u00f3gios de parede era comum o uso de um p\u00eandulo<\/b><\/span><\/span><\/span>\u00a0realizando um\u00a0<\/b><\/span><\/span><\/span>movimento harm\u00f4nico simples.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Considere que um desses p\u00eandulos oscila de modo que vai de uma extremidade a outra em 0,5 s.<\/b><\/span><\/span><\/span>\u00a0Assim,\u00a0<\/b><\/span><\/span><\/span>a frequ\u00eancia de oscila\u00e7\u00e3o desse p\u00eandulo\u00a0<\/b><\/span><\/span><\/span>\u00e9, em\u00a0<\/b><\/span><\/span><\/span>Hz,<\/b><\/span><\/span><\/span><\/p>\n

A)\u00a0<\/b><\/span><\/span><\/span>0,5.\u00a0<\/b><\/span><\/span><\/span>B)\u00a0<\/b><\/span><\/span><\/span>1.\u00a0<\/b><\/span><\/span><\/span>C)\u00a0<\/b><\/span><\/span><\/span>2\u03c0.\u00a0<\/b><\/span><\/span><\/span>D)\u00a0<\/b><\/span><\/span><\/span>2, 41.<\/b><\/span><\/span><\/span><\/p>\n

32-<\/span><\/span><\/span>(UECE-CE-019)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Um\u00a0<\/b><\/span><\/span><\/span>disco,\u00a0<\/b><\/span><\/span><\/span>do tipo DVD,\u00a0<\/b><\/span><\/span><\/span>gira com movimento circular uniforme, realizando 30 rpm<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

A\u00a0<\/b><\/span><\/span><\/span>velocidade angular dele, em rad\/s<\/b><\/span><\/span><\/span>, \u00e9<\/b><\/span><\/span><\/span><\/p>\n

A) 30\u03c0. B) 2\u03c0. C) \u03c0. D) 60\u03c0. 44.<\/b><\/span><\/span><\/span><\/p>\n

33-<\/span><\/span><\/span>(FPS-Faculdade Pernambucana de Sa\u00fade-PE-2019)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

As\u00a0<\/b><\/span><\/span><\/span>fun\u00e7\u00f5es hor\u00e1rias<\/b><\/span><\/span><\/span>\u00a0que descrevem as\u00a0<\/b><\/span><\/span><\/span>posi\u00e7\u00f5es de dois corpos, A e B,<\/b><\/span><\/span><\/span>\u00a0que se movem\u00a0<\/b><\/span><\/span><\/span>em linhas paralelas, s\u00e3o: SA(t) = cA\u00a0+ 40t e SB(t) = cB\u00a0+ 50t.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>espa\u00e7o S est\u00e1 expresso em metros,<\/b><\/span><\/span><\/span>\u00a0o\u00a0<\/b><\/span><\/span><\/span>tempo t est\u00e1 expresso em segundos<\/b><\/span><\/span><\/span>, e\u00a0<\/b><\/span><\/span><\/span>cA\u00a0e cB\u00a0s\u00e3o constantes expressas em metros.<\/b><\/span><\/span><\/span><\/p>\n

Sabe \u2013 se que\u00a0<\/b><\/span><\/span><\/span>em t = 0, SA\u00a0\u2013 SB\u00a0= 50 m. Determine o instante de tempo\u00a0<\/b><\/span><\/span><\/span>em que as\u00a0<\/b><\/span><\/span><\/span>posi\u00e7\u00f5es dos dois corpos coincidem, isto \u00e9, SA\u00a0\u2013 SB\u00a0= 0.<\/b><\/span><\/span><\/span>\u00a0D\u00ea sua\u00a0<\/b><\/span><\/span><\/span>resposta em segundos.<\/b><\/span><\/span><\/span><\/p>\n

A)\u00a0<\/b><\/span><\/span><\/span>1,0 s\u00a0<\/b><\/span><\/span><\/span>B)\u00a0<\/b><\/span><\/span><\/span>5,0 s\u00a0<\/b><\/span><\/span><\/span>C)\u00a0<\/b><\/span><\/span><\/span>3,0 s\u00a0<\/b><\/span><\/span><\/span>D)\u00a0<\/b><\/span><\/span><\/span>4,0 s\u00a0<\/b><\/span><\/span><\/span>E)\u00a0<\/b><\/span><\/span><\/span>2,0 s<\/b><\/span><\/span><\/span><\/p>\n

34-<\/span><\/span><\/span>(UPE-PE-019)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

<\/p>\n

35-<\/span><\/span><\/span>(UPE-PE-019)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Ao\u00a0<\/b><\/span><\/span><\/span>deslocar-se no sentido Recife-Gravat\u00e1,<\/b><\/span><\/span><\/span>\u00a0passa-se\u00a0<\/b><\/span><\/span><\/span>primeiro pela Ponte Cascavel,\u00a0<\/b><\/span><\/span><\/span>cujo<\/b><\/span><\/span><\/span><\/p>\n

comprimento \u00e9 de 450 m.<\/b><\/span><\/span><\/span>\u00a0e,\u00a0<\/b><\/span><\/span><\/span>cerca de 3,5 km ap\u00f3s, passar\u00e1 pelo T\u00fanel de mesmo nome\u00a0<\/b><\/span><\/span><\/span>com<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

comprimento de 370 m.<\/b><\/span><\/span><\/span>\u00a0Um\u00a0<\/b><\/span><\/span><\/span>caminh\u00e3o,<\/b><\/span><\/span><\/span>\u00a0com aproximadamente\u00a0<\/b><\/span><\/span><\/span>30 m de comprimento, inicia a travessia da ponte com velocidade constante de 72 km\/h, mantendo-a at\u00e9 a entrada do t\u00fanel<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

No\u00a0<\/b><\/span><\/span><\/span>momento da travessia do t\u00fanel, passa a existir a acelera\u00e7\u00e3o de 5\/8 m\/s2.<\/b><\/span><\/span><\/span><\/p>\n

Qual o tempo total aproximado que o caminh\u00e3o gastou na travessia da ponte e do t\u00fanel?<\/b><\/span><\/span><\/span><\/p>\n

a)\u00a0<\/b><\/span><\/span><\/span>16 s\u00a0<\/b><\/span><\/span><\/span>b)\u00a0<\/b><\/span><\/span><\/span>24 s\u00a0<\/b><\/span><\/span><\/span>c)\u00a0<\/b><\/span><\/span><\/span>40 s\u00a0<\/b><\/span><\/span><\/span>d)\u00a0<\/b><\/span><\/span><\/span>44 s\u00a0<\/b><\/span><\/span><\/span>e)\u00a0<\/b><\/span><\/span><\/span>64 s<\/b><\/span><\/span><\/span><\/p>\n

36-<\/span><\/span><\/span>(UEMA-MA-019)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Por\u00a0<\/b><\/span><\/span><\/span>quest\u00f5es de seguran\u00e7a,<\/b><\/span><\/span><\/span>\u00a0a\u00a0<\/b><\/span><\/span><\/span>Aeron\u00e1utica reduz altura de pr\u00e9dios em \u00e1rea de aeroportos<\/b><\/span><\/span><\/span>. Com a\u00a0<\/b><\/span><\/span><\/span>mudan\u00e7a, em um raio de at\u00e9 4 quil\u00f4metros\u00a0<\/b><\/span><\/span><\/span>no\u00a0<\/b><\/span><\/span><\/span>entorno dos aeroportos,<\/b><\/span><\/span><\/span>\u00a0o\u00a0<\/b><\/span><\/span><\/span>limite de altura para constru\u00e7\u00e3o de obst\u00e1culos ser\u00e1 de 45 metros.<\/b><\/span><\/span><\/span><\/p>\n

Uma\u00a0<\/b><\/span><\/span><\/span>aeronave levanta voo em B\u00a0<\/b><\/span><\/span><\/span>e\u00a0<\/b><\/span><\/span><\/span>sobe fazendo um \u00e2ngulo constante de 10\u00b0 com a horizontal.<\/b><\/span><\/span><\/span><\/p>\n

A\u00a0<\/b><\/span><\/span><\/span>3 km de dist\u00e2ncia do ponto B, h\u00e1 um pr\u00e9dio de 45 metros de altura.<\/b><\/span><\/span><\/span><\/p>\n

Considere<\/b><\/span><\/span><\/span>\u00a0que a\u00a0<\/b><\/span><\/span><\/span>tangente de 10\u00b0 \u00e9 0,17.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

No\u00a0<\/b><\/span><\/span><\/span>exato momento em que a referida aeronave ultrapassa o pr\u00e9dio, a altura, em metros, que essa aeronave est\u00e1 do topo do pr\u00e9dio\u00a0<\/b><\/span><\/span><\/span>\u00e9 igual a<\/b><\/span><\/span><\/span><\/p>\n

a)\u00a0<\/b><\/span><\/span><\/span>510\u00a0<\/b><\/span><\/span><\/span>b)\u00a0<\/b><\/span><\/span><\/span>465\u00a0<\/b><\/span><\/span><\/span>c)\u00a0<\/b><\/span><\/span><\/span>0,51\u00a0<\/b><\/span><\/span><\/span>d)\u00a0<\/b><\/span><\/span><\/span>44,49\u00a0<\/b><\/span><\/span><\/span>e)\u00a0<\/b><\/span><\/span><\/span>6<\/b><\/span><\/span><\/span><\/p>\n

37-<\/span><\/span><\/span>(UniCEUB \u2013 Medicina \u2013 DF \u2013 019)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Uma\u00a0<\/b><\/span><\/span><\/span>espingarda \u00e9 posicionada horizontalmente<\/b><\/span><\/span><\/span>\u00a0enquanto um\u00a0<\/b><\/span><\/span><\/span>feixe de LASER, paralelo e rente ao cano da espingarda,<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>projeta um ponto luminoso em um muro vertical, que se encontra adiante da arma.<\/b><\/span><\/span><\/span>\u00a0Quando\u00a0<\/b><\/span><\/span><\/span>um tiro \u00e9 deflagrado,\u00a0<\/b><\/span><\/span><\/span>o\u00a0<\/b><\/span><\/span><\/span>proj\u00e9til deixa a boca do cano da espingarda a 400 m\/s<\/b><\/span><\/span><\/span>\u00a0e\u00a0<\/b><\/span><\/span><\/span>atinge<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

o muro, 20 cm abaixo do ponto indicado pelo LASER<\/b><\/span><\/span><\/span>. Considerando\u00a0<\/b><\/span><\/span><\/span>desprez\u00edvel a a\u00e7\u00e3o do ar sobre o proj\u00e9til<\/b><\/span><\/span><\/span>\u00a0e admitindo que a\u00a0<\/b><\/span><\/span><\/span>acelera\u00e7\u00e3o da gravidade seja 10 m\/s2<\/b><\/span><\/span><\/span>, a\u00a0<\/b><\/span><\/span><\/span>dist\u00e2ncia da boca do cano da espingarda at\u00e9 o muro \u00e9 mais pr\u00f3xima<\/b><\/span><\/span><\/span>\u00a0de<\/b><\/span><\/span><\/span><\/p>\n

(A)\u00a0<\/b><\/span><\/span><\/span>40 m.\u00a0<\/b><\/span><\/span><\/span>(B)\u00a0<\/b><\/span><\/span><\/span>50 m.\u00a0<\/b><\/span><\/span><\/span>(C)\u00a0<\/b><\/span><\/span><\/span>60 m.\u00a0<\/b><\/span><\/span><\/span>(D)\u00a0<\/b><\/span><\/span><\/span>70 m.\u00a0<\/b><\/span><\/span><\/span>(E)\u00a0<\/b><\/span><\/span><\/span>80 m.<\/b><\/span><\/span><\/span><\/p>\n

38-<\/span><\/span><\/span>(Universidade do Estado de Mato Grosso \u2013\u00a0UNEMAT \u2013 019)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Na\u00a0<\/b><\/span><\/span><\/span>Figura , em (a) \u00e9 mostrado um t\u00edpico ciclocomputador utilizado por ciclistas para registrar a dist\u00e2ncia percorrida no treino.<\/b><\/span><\/span><\/span>\u00a0Em\u00a0<\/b><\/span><\/span><\/span>(b) \u00e9 mostrado o esquema de funcionamento do aparelho.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Quando a\u00a0<\/b><\/span><\/span><\/span>roda da bicicleta gira, um magneto (\u00edm\u00e3) preso a um dos aros da roda passa pr\u00f3ximo ao sensor a cada rota\u00e7\u00e3o completa.<\/b><\/span><\/span><\/span>\u00a0O\u00a0<\/b><\/span><\/span><\/span>sensor registra a passagem e transmite ao ciclocomputador.<\/b><\/span><\/span><\/span><\/p>\n

Tem-se assim\u00a0<\/b><\/span><\/span><\/span>registrado o n\u00famero \u201cn\u201d de voltas completas da roda.<\/b><\/span><\/span><\/span>\u00a0Quando o\u00a0<\/b><\/span><\/span><\/span>ciclista insere no ciclocomputador o raio \u201cR\u201d da roda, este informa a dist\u00e2ncia percorrida.<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>Assinale a alternativa que cont\u00e9m a equa\u00e7\u00e3o utilizada pelo ciclocomputador para calcular a dist\u00e2ncia (DIST) percorrida.<\/b><\/span><\/span><\/span><\/p>\n

(A)\u00a0<\/b><\/span><\/span><\/span>DIST = (2\u03c0.R.n)\/180<\/b><\/span><\/span><\/span><\/p>\n

(B)\u00a0<\/b><\/span><\/span><\/span>DIST = \u03c0.2R.n<\/b><\/span><\/span><\/span><\/p>\n

(C)\u00a0<\/b><\/span><\/span><\/span>DIST = (\u03c0.2R)\/n<\/b><\/span><\/span><\/span><\/p>\n

(D)\u00a0<\/b><\/span><\/span><\/span>DIST = 2\u03c0.R.n<\/b><\/span><\/span><\/span><\/p>\n

(E)\u00a0<\/b><\/span><\/span><\/span>DIST = \u03c0.R.n<\/b><\/span><\/span><\/span><\/p>\n

39-<\/span><\/span><\/span>(Universidade Federal de Mato Grosso do Sul \u2013\u00a0<\/b><\/span><\/span><\/span>UFMS<\/b><\/u><\/span><\/span><\/span><\/a>\u00a0\u2013 019)\u00a0<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

No\u00a0<\/b><\/span><\/span><\/span>dia 4 de novembro de 2018, foi realizada a 8\u00aa volta UFMS.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>percurso tem largada e chegada em frente ao pr\u00e9dio da Reitoria da universidade, com circuitos de uma ou duas voltas,\u00a0<\/b><\/span><\/span><\/span>sendo\u00a0<\/b><\/span><\/span><\/span>cada volta de\u00a03,5 km.<\/b><\/span><\/span><\/span><\/p>\n

Um\u00a0<\/b><\/span><\/span><\/span>atleta que correr\u00e1 as duas voltas terminar\u00e1 a primeira volta com um pace m\u00e9dio\u00a0<\/b><\/span><\/span><\/span>de<\/b><\/span><\/span><\/span><\/p>\n

6,0 min\/km.<\/b><\/span><\/span><\/span>\u00a0Como\u00a0<\/b><\/span><\/span><\/span>ele pretende completar a prova com um pace m\u00e9dio de\u00a05,0 min\/km<\/b><\/span><\/span><\/span>,\u00a0a<\/b><\/span><\/span><\/span><\/p>\n

segunda volta deve ser completada com uma velocidade m\u00e9dia<\/b><\/span><\/span><\/span>\u00a0de:<\/b><\/span><\/span><\/span><\/p>\n

A)\u00a0<\/b><\/span><\/span><\/span>4,0 km\/h.<\/b><\/span><\/span><\/span><\/p>\n

B)\u00a0<\/b><\/span><\/span><\/span>12 km\/h.<\/b><\/span><\/span><\/span><\/p>\n

C)\u00a0<\/b><\/span><\/span><\/span>14,4 km\/h.<\/b><\/span><\/span><\/span><\/p>\n

D)\u00a0<\/b><\/span><\/span><\/span>15 km\/h.<\/b><\/span><\/span><\/span><\/p>\n

E)\u00a0<\/b><\/span><\/span><\/span>18 km\/h.<\/b><\/span><\/span><\/span><\/p>\n

40-<\/span><\/span><\/span>(PUC-RJ\/018)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

\"Cinem\u00e1tica\"<\/p>\n

 <\/p>\n

Confira a resolu\u00e7\u00e3o comentada<\/a><\/span><\/h3>\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":"

Cinem\u00e1tica 2018\/2019 01 \u2013 (ENEM-MEC-018) 02-(ENEM-MEC-017) 03-(ENEM-MEC-017) 04-(ENEM-MEC-017) Em um\u00a0telef\u00e9rico tur\u00edstico,\u00a0bondinhos saem de esta\u00e7\u00f5es ao n\u00edvel do mar\u00a0e do\u00a0topo de uma montanha.\u00a0A\u00a0travessia dura 1,5 minuto\u00a0e\u00a0ambos os bondinhos se deslocam \u00e0 mesma velocidade. Quarenta segundos ap\u00f3s o bondinho A partir da esta\u00e7\u00e3o ao n\u00edvel do mar,\u00a0ele\u00a0cruza com o bondinho B, que havia sa\u00eddo do topo da montanha. Quantos segundos ap\u00f3s a<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3123,"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-4862","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4862","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=4862"}],"version-history":[{"count":5,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4862\/revisions"}],"predecessor-version":[{"id":9879,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4862\/revisions\/9879"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3123"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=4862"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}