{"id":4885,"date":"2020-01-10T03:14:00","date_gmt":"2020-01-10T03:14:00","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=4885"},"modified":"2024-06-29T23:33:34","modified_gmt":"2024-06-29T23:33:34","slug":"gravitacao-2018-2019","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/vestibulares-recentes\/mecanica\/gravitacao-2018-2019\/","title":{"rendered":"Gravita\u00e7\u00e3o 2018\/2019"},"content":{"rendered":"

Gravita\u00e7\u00e3o<\/b><\/span><\/span><\/span><\/p>\n

01- (UEMG-MG-018)<\/b><\/span><\/span><\/span><\/p>\n

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02-(UEMG-MG-018)<\/b><\/span><\/span><\/span><\/p>\n

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(C) desrespeitam as no\u00e7\u00f5es de gravidade artificial\u00a0<\/b><\/span><\/span><\/span>no interior da nave,\u00a0<\/b><\/span><\/span><\/span>desconsiderando efeitos de imponderabilidade.<\/b><\/span><\/span><\/span><\/p>\n

(D) desrespeitam as no\u00e7\u00f5es de din\u00e2micas de voo\u00a0<\/b><\/span><\/span><\/span>em superf\u00edcies planet\u00e1rias,\u00a0<\/b><\/span><\/span><\/span>adotando designs n\u00e3o aerodin\u00e2micos de naves.<\/b><\/span><\/span><\/span><\/p>\n

03-UERJ-RJ\/018)<\/b><\/span><\/span><\/span><\/p>\n

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Considere a\u00a0<\/b><\/span><\/span><\/span>exist\u00eancia\u00a0<\/b><\/span><\/span><\/span>de um\u00a0<\/b><\/span><\/span><\/span>planeta homog\u00eaneo,\u00a0<\/b><\/span><\/span><\/span>situado em\u00a0<\/b><\/span><\/span><\/span>uma gal\u00e1xia distante,\u00a0<\/b><\/span><\/span><\/span>e as\u00a0<\/b><\/span><\/span><\/span>informa\u00e7\u00f5es sobre seus dois sat\u00e9lites apresentadas<\/b><\/span><\/span><\/span>\u00a0na\u00a0<\/b><\/span><\/span><\/span>tabela.<\/b><\/span><\/span><\/span><\/p>\n

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Sabe-se\u00a0<\/b><\/span><\/span><\/span>que o\u00a0<\/b><\/span><\/span><\/span>movimento de X e Y ocorre exclusivamente sob a\u00e7\u00e3o da for\u00e7a gravitacional<\/b><\/span><\/span><\/span>\u00a0do\u00a0<\/b><\/span><\/span><\/span>planeta.<\/b><\/span><\/span><\/span>\u00a0Determine a\u00a0<\/b><\/span><\/span><\/span>raz\u00e3o\u00a0.<\/b><\/span><\/span><\/span><\/p>\n

04-(Faculdade de Medicina de Jundia\u00ed \u201cFMJ\u201d \u2013SP \u2013 018)<\/b><\/span><\/span><\/span><\/p>\n

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

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06-(PUCCAMP \u2013 SP \u2013 018)<\/b><\/span><\/span><\/span><\/p>\n

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07-(FAMERP-SP-018)<\/b><\/span><\/span><\/span><\/p>\n

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08-(UNICAMP-SP-018)<\/b><\/span><\/span><\/span><\/p>\n

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Recentemente, a ag\u00eancia espacial americana\u00a0<\/b><\/span><\/span><\/span>anunciou a\u00a0<\/b><\/span><\/span><\/span>descoberta de um planeta\u00a0<\/b><\/span><\/span><\/span>a\u00a0<\/b><\/span><\/span><\/span>trinta e nove anos-luz da Terra,\u00a0<\/b><\/span><\/span><\/span>orbitando uma\u00a0<\/b><\/span><\/span><\/span>estrela an\u00e3 vermelha\u00a0<\/b><\/span><\/span><\/span>que\u00a0<\/b><\/span><\/span><\/span>faz parte da constela\u00e7\u00e3o\u00a0<\/b><\/span><\/span><\/span>de\u00a0<\/b><\/span><\/span><\/span>Cetus.<\/b><\/span><\/span><\/span><\/p>\n

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O\u00a0<\/b><\/span><\/span><\/span>novo planeta possui dimens\u00f5es\u00a0<\/b><\/span><\/span><\/span>e\u00a0<\/b><\/span><\/span><\/span>massa pouco maiores do que as da Terra\u00a0<\/b><\/span><\/span><\/span>e se\u00a0<\/b><\/span><\/span><\/span>tornou\u00a0<\/b><\/span><\/span><\/span>um dos\u00a0<\/b><\/span><\/span><\/span>principais candidatos a abrigar vida fora do sistema solar.<\/b><\/span><\/span><\/span><\/p>\n

Considere\u00a0<\/b><\/span><\/span><\/span>este novo planeta esf\u00e9rico\u00a0<\/b><\/span><\/span><\/span>com um\u00a0<\/b><\/span><\/span><\/span>raio igual a RP\u00a0= 2RT<\/b><\/span><\/span><\/span>\u00a0e\u00a0<\/b><\/span><\/span><\/span>massa MP\u00a0= 8MT\u00a0,\u00a0<\/b><\/span><\/span><\/span>em que\u00a0<\/b><\/span><\/span><\/span>RT\u00a0e MT\u00a0s\u00e3o o raio e a massa da Terra, respectivamente.<\/b><\/span><\/span><\/span><\/p>\n

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Assim,\u00a0<\/b><\/span><\/span><\/span>considerando a Terra esf\u00e9rica<\/b><\/span><\/span><\/span>\u00a0e\u00a0<\/b><\/span><\/span><\/span>usando a acelera\u00e7\u00e3o da gravidade na sua superf\u00edcie como gT\u00a0= 10 m\/s2,\u00a0<\/b><\/span><\/span><\/span>o\u00a0<\/b><\/span><\/span><\/span>valor da acelera\u00e7\u00e3o da gravidade na superf\u00edcie do novo planeta\u00a0<\/b><\/span><\/span><\/span>ser\u00e1 de<\/b><\/span><\/span><\/span><\/p>\n

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09-(ITA \u2013 SP \u2013 019)<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span><\/p>\n

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Considere um\u00a0<\/b><\/span><\/span><\/span>corpo celeste esf\u00e9rico e homog\u00eaneo de massa M e raio R atravessado de polo a polo por um t\u00fanel cil\u00edndrico retil\u00edneo de di\u00e2metro desprez\u00edvel<\/b><\/span><\/span><\/span>. Em um desses polos um\u00a0<\/b><\/span><\/span><\/span>objeto pontual \u00e9 solto a partir do repouso no instante t = 0.<\/b><\/span><\/span><\/span>\u00a0Sendo G a constante universal de gravita\u00e7\u00e3o, esse objeto\u00a0<\/b><\/span><\/span><\/span>vai alcan\u00e7ar o outro polo ap\u00f3s o intervalo de tempo dado por<\/b><\/span><\/span><\/span><\/p>\n

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10- (FAMERP 2019 \u2013 Conhecimentos Gerais)<\/b><\/span><\/span><\/span><\/p>\n

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A tabela mostra alguns dados referentes ao planeta Urano.<\/b><\/span><\/span><\/span><\/p>\n

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Para calcular a for\u00e7a de atra\u00e7\u00e3o gravitacional m\u00e9dia entre o Sol e Urano, somente com os dados da tabela, deve-se usar apenas e necessariamente<\/b><\/span><\/span><\/span><\/p>\n

(A) a dist\u00e2ncia m\u00e9dia ao Sol, o per\u00edodo de transla\u00e7\u00e3o ao redor do Sol e a massa.<\/b><\/span><\/span><\/span><\/p>\n

(B) a dist\u00e2ncia m\u00e9dia ao Sol, a massa e o di\u00e2metro equatorial.<\/b><\/span><\/span><\/span><\/p>\n

(C) a dist\u00e2ncia m\u00e9dia ao Sol, a acelera\u00e7\u00e3o gravitacional na superf\u00edcie e o per\u00edodo de rota\u00e7\u00e3o.<\/b><\/span><\/span><\/span><\/p>\n

(D) o per\u00edodo de rota\u00e7\u00e3o, o di\u00e2metro equatorial e a acelera\u00e7\u00e3o gravitacional na superf\u00edcie.<\/b><\/span><\/span><\/span><\/p>\n

(E) o per\u00edodo de transla\u00e7\u00e3o ao redor do Sol, a massa e o di\u00e2metro equatorial.<\/b><\/span><\/span><\/span><\/p>\n

11- (Insper \u2013 SP \u2013 2019)<\/b><\/span><\/span><\/span><\/p>\n

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As\u00a0<\/b><\/span><\/span><\/span>leis da gravita\u00e7\u00e3o universal<\/b><\/span><\/span><\/span>, aplicadas ao movimento de planetas e sat\u00e9lites em \u00f3rbita est\u00e1vel, permitem concluir que\u00a0<\/b><\/span><\/span><\/span>a energia cin\u00e9tica desses corpos depende de sua massa, da massa do centro de for\u00e7as em torno do qual orbitam e da dist\u00e2ncia m\u00fatua entre eles\u00a0<\/b><\/span><\/span><\/span>(raio orbital). Assim, o\u00a0<\/b><\/span><\/span><\/span>gr\u00e1fico que melhor representa qualitativamente a energia cin\u00e9tica (Ec) de planeta ou sat\u00e9lite em \u00f3rbita est\u00e1vel, em fun\u00e7\u00e3o do raio orbital (r),\u00a0<\/b><\/span><\/span><\/span>\u00e9 o ilustrado em:<\/b><\/span><\/span><\/span><\/p>\n

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

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\"Gravita\u00e7\u00e3o\"<\/p>\n

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Confira a resolu\u00e7\u00e3o comentada<\/a><\/h3>\n

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

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

Gravita\u00e7\u00e3o 01- (UEMG-MG-018) 02-(UEMG-MG-018) (C) desrespeitam as no\u00e7\u00f5es de gravidade artificial\u00a0no interior da nave,\u00a0desconsiderando efeitos de imponderabilidade. (D) desrespeitam as no\u00e7\u00f5es de din\u00e2micas de voo\u00a0em superf\u00edcies planet\u00e1rias,\u00a0adotando designs n\u00e3o aerodin\u00e2micos de naves. 03-UERJ-RJ\/018) Considere a\u00a0exist\u00eancia\u00a0de um\u00a0planeta homog\u00eaneo,\u00a0situado em\u00a0uma gal\u00e1xia distante,\u00a0e as\u00a0informa\u00e7\u00f5es sobre seus dois sat\u00e9lites apresentadas\u00a0na\u00a0tabela. Sabe-se\u00a0que o\u00a0movimento de X e Y ocorre exclusivamente sob a\u00e7\u00e3o da for\u00e7a gravitacional\u00a0do\u00a0planeta.\u00a0Determine a\u00a0raz\u00e3o\u00a0.<\/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-4885","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4885","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=4885"}],"version-history":[{"count":4,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4885\/revisions"}],"predecessor-version":[{"id":9881,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4885\/revisions\/9881"}],"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=4885"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}