{"id":671,"date":"2015-05-12T17:25:34","date_gmt":"2015-05-12T17:25:34","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=671"},"modified":"2024-09-02T17:36:39","modified_gmt":"2024-09-02T17:36:39","slug":"resolucao-comentada-da-udesc","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/universidades-2015\/exercicios-resolvidos-da-udesc-2015\/resolucao-comentada-da-udesc\/","title":{"rendered":"Resolu\u00e7\u00e3o Comentada da UDESC"},"content":{"rendered":"

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

01- <\/b><\/span><\/span><\/span>I. Verdadeira,<\/b><\/span><\/span><\/span> trata-se de um MHS.<\/b><\/span><\/span><\/span><\/p>\n

II. Falsa,<\/b><\/span><\/span><\/span> em <\/b><\/span><\/span>A<\/b><\/span><\/span><\/span> a energia cin\u00e9tica \u00e9 <\/b><\/span><\/span>nula e em B \u00e9 m\u00e1xima<\/b><\/span><\/span><\/span> e a <\/b><\/span><\/span>potencial \u00e9 nula em B e m\u00e1xima em A.<\/b><\/span><\/span><\/span><\/p>\n

III. Correta, <\/b><\/span><\/span><\/span>veja II.<\/b><\/span><\/span><\/span><\/p>\n

IV. Falsa, <\/b><\/span><\/span><\/span>veja II.<\/b><\/span><\/span><\/span><\/p>\n

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

02- <\/b><\/span><\/span><\/span>Veja <\/b><\/span><\/span><\/span>tabela abaixo:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

03- <\/b><\/span><\/span><\/span>Veja <\/b><\/span><\/span><\/span>informa\u00e7\u00e3o abaixo:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

f<\/b><\/span><\/span><\/span>a<\/b><\/span><\/span><\/sub><\/span>= 630[340\/(340 \u2013 25) = 630.(340\/315) = 630.1,08 <\/b><\/span><\/span><\/span>= 680 Hz.<\/b><\/span><\/span><\/span><\/p>\n

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

04- <\/b><\/span><\/span><\/span>I. Falsa,<\/b><\/span><\/span><\/span>Quando um corpo exerce for\u00e7a sobre o outro, este reage sobre o primeiro com uma for\u00e7a de mesma intensidade, mesma dire\u00e7\u00e3o e<\/b><\/span><\/span><\/span>sentido contr\u00e1rio.<\/b><\/span><\/span><\/span><\/p>\n

II. Correta<\/b><\/span><\/span><\/span>, Segunda lei de Newton ou princ\u00edpio fundamental da Din\u00e2mica.<\/b><\/span><\/span><\/span><\/p>\n

III. Correta,<\/b><\/span><\/span><\/span> Princ\u00edpio da In\u00e9rcia.<\/b><\/span><\/span><\/span><\/p>\n

IV. Falsa,<\/b><\/span><\/span><\/span> A intensidade, a dire\u00e7\u00e3o e o sentido da for\u00e7a resultante agindo em um corpo \u00e9 igual \u00e0 intensidade, \u00e0 dire\u00e7\u00e3o e ao sentido da acelera\u00e7\u00e3o que este corpo adquire <\/b><\/span><\/span><\/span>multiplicada pela sua massa. <\/b><\/span><\/span><\/span><\/p>\n

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

05- <\/b><\/span><\/span><\/span>I. Correta<\/b><\/span><\/span><\/span>, Quando a luz <\/b><\/span><\/span><\/span>incide num vidro transparente<\/b><\/span><\/span><\/span> ocorre simultaneamente dois fen\u00f4menos, <\/b><\/span><\/span><\/span>refra\u00e7\u00e3o e reflex\u00e3o.<\/b><\/span><\/span><\/span><\/p>\n

<\/a> II. Falsa,<\/b><\/span><\/span><\/span> <\/b>prismas dispersivos<\/b><\/span><\/span><\/span>\u00a0\u2013 <\/b><\/span><\/span>decomp\u00f5em (dispersam) a luz policrom\u00e1tica branca<\/b><\/span><\/span><\/span> em suas <\/b><\/span><\/span>infinitas<\/b><\/span><\/span><\/span> componentes monocrom\u00e1ticas (cores) que comp\u00f5em o espectro luminoso.<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

Ocorre a <\/b><\/span><\/span><\/span>dispers\u00e3o<\/b><\/span><\/span><\/span> porque <\/b><\/span><\/span><\/span>cada cor monocrom\u00e1tica<\/b><\/span><\/span><\/span> se move com <\/b><\/span><\/span><\/span>velocidade diferente<\/b><\/span><\/span><\/span> no interior do prisma. <\/b><\/span><\/span><\/span><\/p>\n

III. Falsa,<\/b><\/span><\/span><\/span> veja II.<\/b><\/span><\/span><\/span><\/p>\n

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

06- <\/b><\/span><\/span><\/span>I. Verdadeira<\/b><\/span><\/span><\/span>, a massa \u00e9 a medida da <\/b><\/span><\/span><\/span>in\u00e9rcia<\/b><\/span><\/span><\/span> de um corpo. Assim, \u00e0 medida que a <\/b><\/span><\/span><\/span>velocidade de um corpo aumenta sua in\u00e9rcia tamb\u00e9m aumenta e quando a velocidade do corpo tende \u00e0 velocidade da<\/b><\/span><\/span><\/span> <\/b>luz ( a maior poss\u00edvel), sua in\u00e9rcia\u00a0 e consequentemente sua massa tende ao infinito.<\/b><\/span><\/span><\/span> Portanto, al\u00e9m do espa\u00e7o e do tempo, na teoria da velocidade a massa tamb\u00e9m varia e essa varia\u00e7\u00e3o \u00e9 fornecida pela express\u00e3o:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Na express\u00e3o acima\u00a0<\/b><\/span><\/span><\/span>m<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>\u00a0\u00e9 denominada massa de repouso\u00a0<\/b><\/span><\/span><\/span>e\u00a0<\/b><\/span><\/span><\/span>m, de massa relativ\u00edstica.<\/b><\/span><\/span><\/span><\/p>\n

Observe na express\u00e3o acima que, se a velocidade V do corpo tende \u00e0 velocidade da luz c\u00a0 —\u00a0 m=m<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>\/\u221a1 \u2013 V<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>\/c<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>\u00a0 —\u00a0 m=m<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>\/\u221a1 \u2013 c<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>\/c<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>\u00a0 —\u00a0 m=m<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>\/\u221a1 \u2013 1\u00a0 —\u00a0 m=m<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>\/\"\"0\u00a0 —\u00a0 <\/b><\/span><\/span><\/span>quando o denominador tende a zero, a massa m tende ao infinito.<\/b><\/span><\/span><\/span><\/p>\n

II. Falsa<\/b><\/span><\/span><\/span>,<\/span> a velocidade da luz <\/b><\/span><\/span><\/span>n\u00e3o depende nem da velocidade do emissor<\/b><\/span><\/span><\/span> (fonte emissora da luz), <\/b><\/span><\/span><\/span>nem da velocidade do receptor<\/b><\/span><\/span><\/span> (observador) do sinal luminoso. A velocidade da luz no v\u00e1cuo \u00e9 a velocidade m\u00e1xima poss\u00edvel de transmiss\u00e3o de intera\u00e7\u00e3o na Natureza e seu valor \u00e9 c=3,0.10<\/b><\/span><\/span><\/span>8<\/b><\/span><\/span><\/sup><\/span> m\/s. Ela <\/b><\/span><\/span><\/span>n\u00e3o depende do sistema de refer\u00eancia inercial adotado.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

III. Falsa<\/b><\/span><\/span><\/span><\/p>\n

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

07- <\/b><\/span><\/span><\/span>P<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>.V<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>\/T<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span> = P.V\/T<\/b><\/span><\/span><\/span> \"\" <\/b><\/span><\/span><\/span>isot\u00e9rmica,<\/b><\/span><\/span><\/span> mesma temperatura \"\" <\/b><\/span><\/span><\/span>P<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>.V<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span> = P.V<\/b><\/span><\/span><\/span> \"\" 1,6.2 = P<\/b><\/span><\/span><\/span>x<\/b><\/span><\/span><\/sub><\/span>.8 \"\" <\/b><\/span><\/span><\/span>P<\/b><\/span><\/span><\/span>x<\/b><\/span><\/span><\/sub><\/span> = 0,4 atm<\/b><\/span><\/span><\/span> \"\" <\/b><\/span><\/span><\/span>P<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>.V<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span> = P.V<\/b><\/span><\/span><\/span> \"\" 1,6.2 = 0,8.V<\/b><\/span><\/span><\/span>y<\/b><\/span><\/span><\/sub><\/span> \"\" <\/b><\/span><\/span><\/span>V<\/b><\/span><\/span><\/span>y<\/b><\/span><\/span><\/sub><\/span> = 4 L.<\/b><\/span><\/span><\/span><\/p>\n

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

08- <\/b><\/span><\/span><\/span>Mesmas cargas el\u00e9tricas <\/b><\/span><\/span><\/span>(mesmo sinal) se repelem.<\/b><\/span><\/span><\/span> Para <\/b><\/span><\/span><\/span>aproxim\u00e1-las<\/b><\/span><\/span><\/span>, voc\u00ea deve exercer <\/b><\/span><\/span><\/span>for\u00e7a<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

contra<\/b><\/span><\/span><\/span> <\/b>o campo el\u00e9trico<\/b><\/span><\/span><\/span>. Essa for\u00e7a <\/b><\/span><\/span><\/span>provoca em aumento da energia potencial el\u00e9trica do sistema das duas cargas.<\/b><\/span><\/span><\/span><\/p>\n

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

09- <\/b><\/span><\/span><\/span>As linhas de for\u00e7a do campo magn\u00e9tico produzido por um solen\u00f3ide s\u00e3o id\u00eanticas aos do <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

campo magn\u00e9tico produzido por um \u00edm\u00e3.\u00a0 Na pr\u00e1tica, \u00e9 <\/b><\/span><\/span><\/span>indiferente<\/b><\/span><\/span><\/span> produzir-se um campo magn\u00e9tico por um <\/b><\/span><\/span><\/span>\u00edm\u00e3 ou por um solen\u00f3ide.<\/b><\/span><\/span><\/span><\/p>\n

No <\/b><\/span><\/span><\/span>interior do solen\u00f3ide o campo magn\u00e9tico \u00e9 praticamente uniforme (retas paralelas ao eixo do solen\u00f3ide) e sua intensidade \u00e9 constante e vale:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

B = <\/b><\/span><\/span><\/span>4\u03c0.10<\/b><\/span><\/span><\/span>-7<\/b><\/span><\/span><\/sup><\/span>.10<\/b><\/span><\/span><\/span>4<\/b><\/span><\/span><\/sup><\/span>.2.10<\/b><\/span><\/span><\/span>-1<\/b><\/span><\/span><\/sup><\/span>\/1 \"\" <\/b><\/span><\/span><\/span>B = 8\u03c0.10<\/b><\/span><\/span><\/span>-4<\/b><\/span><\/span><\/sup><\/span> T.<\/b><\/span><\/span><\/span><\/p>\n

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

10- <\/b><\/span><\/span><\/span>I. Falsa,<\/b><\/span><\/span><\/span> a corrente el\u00e9trica que chega \u00e0s resid\u00eancias \u00e9 <\/b><\/span><\/span><\/span>alternada.<\/b><\/span><\/span><\/span><\/p>\n

II. Falsa,<\/b><\/span><\/span><\/span> <\/b>quilowatt-hora<\/b><\/i><\/span><\/span><\/span> <\/b>\u00e9 medida<\/b><\/span><\/span><\/span> de energia el\u00e9trica<\/b><\/span><\/span><\/span><\/p>\n

III. Correta.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

11- <\/b><\/span><\/span><\/span>A <\/b><\/span><\/span><\/span>freq\u00fc\u00eancia f \u00e9 a mesma independente do meio<\/b><\/span><\/span><\/span> onde a onda estiver se propagando, ela \u00e9 a mesma que a da fonte emissora. <\/b><\/span><\/span><\/span><\/p>\n

No <\/b><\/span><\/span><\/span>v\u00e1cuo<\/b><\/span><\/span><\/span> qualquer onda eletromagn\u00e9tica se propaga com a mesma velocidade que a da luz <\/b><\/span><\/span><\/span>(V = 3.10<\/b><\/span><\/span><\/span>8<\/b><\/span><\/span><\/sup><\/span> m\/s)<\/b><\/span><\/span><\/span> \"\" <\/b><\/span><\/span><\/span>V = \u03bb.f<\/b><\/span><\/span><\/span> \"\" 3.10<\/b><\/span><\/span><\/span>8<\/b><\/span><\/span><\/sup><\/span> = 5.f \"\" <\/b><\/span><\/span><\/span>f <\/b><\/span><\/span><\/span>= 0,6.10<\/b><\/span><\/span><\/span>8<\/b><\/span><\/span><\/sup><\/span> <\/b>= 6.10<\/b><\/span><\/span><\/span>7<\/b><\/span><\/span><\/sup><\/span> Hz.<\/b><\/span><\/span><\/span><\/p>\n

Na \u00e1gua<\/b><\/span><\/span><\/span> \"\" V = \u03bb.f \"\" 2,1.10<\/b><\/span><\/span><\/span>8<\/b><\/span><\/span><\/sup><\/span> = \u03bb.6.10<\/b><\/span><\/span><\/span>7<\/b><\/span><\/span><\/sup><\/span> \"\" <\/b><\/span><\/span><\/span>\u03bb = 2,1.10<\/b><\/span><\/span><\/span>8<\/b><\/span><\/span><\/sup><\/span>\/6.10<\/b><\/span><\/span><\/span>7<\/b><\/span><\/span><\/sup><\/span> \"\" \u03bb <\/b><\/span><\/span><\/span>= 0,35.10<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sup><\/span> = 3,5 m.<\/b><\/span><\/span><\/span><\/p>\n

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

<\/h2>\n

Voltar para exerc\u00edcios<\/span><\/a><\/h2>\n","protected":false},"excerpt":{"rendered":"

RESOLU\u00c7\u00d5ES 01- I. Verdadeira, trata-se de um MHS. II. Falsa, em A a energia cin\u00e9tica \u00e9 nula e em B \u00e9 m\u00e1xima e a potencial \u00e9 nula em B e m\u00e1xima em A. III. Correta, veja II. IV. Falsa, veja II. R- C 02- Veja tabela abaixo: R- A 03- Veja informa\u00e7\u00e3o abaixo: fa= 630[340\/(340 \u2013 25) = 630.(340\/315) =<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":669,"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-671","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/671","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=671"}],"version-history":[{"count":2,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/671\/revisions"}],"predecessor-version":[{"id":675,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/671\/revisions\/675"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/669"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=671"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}