{"id":774,"date":"2015-05-13T15:24:22","date_gmt":"2015-05-13T15:24:22","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=774"},"modified":"2024-09-02T17:32:39","modified_gmt":"2024-09-02T17:32:39","slug":"resolucao-comentada-da-puc-rs-2015","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/universidades-2015\/exercicios-resolvidos-da-puc-rs-2015\/resolucao-comentada-da-puc-rs-2015\/","title":{"rendered":"Resolu\u00e7\u00e3o Comentada da PUC RS 2015"},"content":{"rendered":"

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

01- <\/b><\/span><\/span><\/span>I. Verdadeira \"\" a = (V \u2013 V<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>)\/(t \u2013 t<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>)<\/b><\/span><\/span><\/span> = (10 \u2013 0)\/(10 \u2013 0) \"\"<\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>= 10\/10 <\/b><\/span><\/span><\/span>= 1 m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

II. Verdadeira<\/b><\/span><\/span><\/span> \"\" \u2206S = \u00e1rea do tri\u00e2ngulo = b.h\/2 = 10.10\/2 \"\" <\/b><\/span><\/span>\u2206S = 50m.<\/b><\/span><\/span><\/span><\/p>\n

III. Falsa \"\" <\/b><\/span><\/span><\/span>a velocidade <\/b><\/span><\/span><\/span>varia (aumenta) uniformemente<\/b><\/span><\/span><\/span>, mas a <\/b><\/span><\/span><\/span>dist\u00e2ncia percorrida aumenta a cada segundo.<\/b><\/span><\/span><\/span><\/p>\n

IV. Falsa<\/b><\/span><\/span><\/span> \"\" a acelera\u00e7\u00e3o \u00e9 <\/b><\/span><\/span><\/span>constante a = 1m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span> e a <\/b><\/span><\/span><\/span>velocidade aumenta de 1 m\/s a cada segundo<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

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

02- <\/b><\/span><\/span><\/span>Na <\/b><\/span><\/span>montagem 1<\/b><\/span><\/span><\/span> a polia est\u00e1 <\/b><\/span><\/span>fixa<\/b><\/span><\/span><\/span> e transmite integralmente a for\u00e7a \"\" <\/b><\/span><\/span>T = F.<\/b><\/span><\/span><\/span><\/p>\n

Colocando as for\u00e7as na montagem 2:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

03- <\/b><\/span><\/span><\/span>Se o submarino est\u00e1 a 200m de profundidade, ele estar\u00e1 sujeito \u00e0 <\/b><\/span><\/span>press\u00e3o hidtost\u00e1tica<\/b><\/span><\/span><\/span> (devido \u00e0 coluna de \u00e1gua) <\/b><\/span><\/span>somad<\/b><\/span><\/span><\/span>a com a <\/b><\/span><\/span>press\u00e3o atmosf\u00e9rica<\/b><\/span><\/span><\/span> da superf\u00edcie da \u00e1gua <\/b><\/span><\/span>P<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> =<\/b><\/span><\/span><\/span> 20 + 1 <\/b><\/span><\/span>= 21 atm.<\/b><\/span><\/span><\/span><\/p>\n

A <\/b><\/span><\/span>diferen\u00e7a <\/b><\/span><\/span><\/span>entre a press\u00e3o externa (21 atm) e a interna (1 atm) vale <\/b><\/span><\/span>\u2206P = 21 \u2013 1 = 20 atm.<\/b><\/span><\/span><\/span><\/p>\n

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

04- <\/b><\/span><\/span><\/span>Como ela sobe com <\/b><\/span><\/span><\/span>velocidade constante<\/b><\/span><\/span><\/span>, a <\/b><\/span><\/span><\/span>for\u00e7a<\/b><\/span><\/span><\/span> que est\u00e1 levantando a caixa tem a mesma intensidade que seu pr\u00f3prio <\/b><\/span><\/span><\/span>peso<\/b><\/span><\/span><\/span> \"\" F = P = mg = 1.10 \"\" <\/b><\/span><\/span><\/span>F = 10 N.<\/b><\/span><\/span><\/span><\/p>\n

W = E<\/b><\/span><\/span><\/span><\/span>pf<\/b><\/span><\/span><\/span><\/sub><\/span> \u2013 E<\/b><\/span><\/span><\/span><\/span>pi<\/b><\/span><\/span><\/span><\/sub><\/span> = <\/b><\/span><\/span><\/span><\/span>mgh \u2013 mgh<\/b><\/span><\/span><\/span><\/span>o<\/b><\/span><\/span><\/span><\/sub><\/span> = 1.10.0,1 \u2013 1.10.0 = 0,1 \u2013 0<\/b><\/span><\/span><\/span><\/span> \"\" W = 1 J.<\/b><\/span><\/span><\/span><\/span><\/p>\n

P = W\/t<\/b><\/span><\/span><\/span><\/span> = 1\/1 \"\" <\/b><\/span><\/span><\/span><\/span>P = 1 W.<\/b><\/span><\/span><\/span><\/span><\/p>\n

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

05- <\/b><\/span><\/span><\/span><\/span>\u2206L = L<\/b><\/span><\/span><\/span><\/span>o<\/b><\/span><\/span><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span><\/span>\u03b1<\/b><\/span><\/span><\/span>.(t \u2013 t<\/b><\/span><\/span><\/span><\/span>o<\/b><\/span><\/span><\/span><\/sub><\/span>)<\/b><\/span><\/span><\/span><\/span> \"\" 1 = 800.<\/b><\/span><\/span><\/span>\u03b1<\/b><\/span><\/span>.(110 \u2013 10) \"\" <\/b><\/span><\/span><\/span>\u03b1<\/b><\/span><\/span> = 1\/8.10<\/b><\/span><\/span><\/span>4<\/b><\/span><\/span><\/span><\/sup> \"\" <\/b><\/span><\/span><\/span>\u03b1<\/b><\/span><\/span><\/span> <\/b>= 0,125.10<\/b><\/span><\/span><\/span>-4<\/b><\/span><\/span><\/span><\/sup> <\/b>= 1,25.10<\/b><\/span><\/span><\/span><\/span>-5<\/b><\/span><\/span><\/span><\/sup><\/span> <\/b>o<\/b><\/span><\/span><\/span><\/sup><\/span>C<\/b><\/span><\/span><\/span><\/span>-1<\/b><\/span><\/span><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

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

06- <\/b><\/span><\/span><\/span>A <\/b><\/span><\/span>intensidade do som<\/b><\/span><\/span><\/span> est\u00e1 relacionada com a <\/b><\/span><\/span>amplitude.<\/b><\/span><\/span><\/span> Som mais <\/b><\/span><\/span>forte<\/b><\/span><\/span><\/span> tem <\/b><\/span><\/span>maior amplitude<\/b><\/span><\/span><\/span> e <\/b><\/span><\/span>som<\/b><\/span><\/span><\/span> <\/b><\/p>\n

\"\"<\/p>\n

mais fraco, menor amplitude.<\/b><\/span><\/span><\/span><\/p>\n

Altura <\/b><\/span><\/span><\/span>do som est\u00e1 relacionada com sua <\/b><\/span><\/span><\/span>freq\u00fc\u00eancia<\/b><\/span><\/span><\/span>, ou seja, a altura (tom) \u00e9 a qualidade do som que permite ao ouvido <\/b><\/span><\/span><\/span>distinguir um som grave, de baixa frequ\u00eancia, de um som agudo, de alta freq\u00fc\u00eancia.\u00a0 \u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\u00a0<\/span><\/p>\n

O som <\/b><\/span><\/span><\/span>mais grave<\/b><\/span><\/span><\/span> aud\u00edvel por um <\/b><\/span><\/span><\/span>ouvido humano<\/b><\/span><\/span><\/span> \u00e9 de aproximadamente <\/b><\/span><\/span><\/span>20 Hz<\/b><\/span><\/span><\/span> e o <\/b><\/span><\/span><\/span>mais agudo<\/b><\/span><\/span><\/span> \u00e9 de aproximadamente <\/b><\/span><\/span><\/span>20 000 Hz.<\/b><\/span><\/span><\/span><\/p>\n

R- B\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span><\/p>\n

07- <\/b><\/span><\/span><\/span>Sendo os <\/b><\/span><\/span>valores nominais<\/b><\/span><\/span><\/span> de cada l\u00e2mpada os mesmos <\/b><\/span><\/span>(12V-15W)<\/b><\/span><\/span><\/span>, todas elas possuem a <\/b><\/span><\/span>mesma resist\u00eancia R de valor P = U<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>\/R \"\" 15 = 12<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>\/R \"\" R = 144\/15 = 9,6 \u2126. <\/b><\/span><\/span><\/span><\/p>\n

Observe <\/b><\/span><\/span>atentamente <\/b><\/span><\/span><\/span>a figura abaixo onde as <\/b><\/span><\/span>tens\u00f5es e as correntes em cada l\u00e2mpada foram distribu\u00eddas<\/b><\/span><\/span><\/span>:<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

A) <\/b><\/span><\/span>Falsa<\/b><\/span><\/span><\/span> \"\" a intensidade da corrente el\u00e9trica \u00e9 a <\/b><\/span><\/span>mesma nas l\u00e2mpadas 1 e 2<\/b><\/span><\/span><\/span> e vale i<\/b><\/span><\/span>1<\/b><\/span><\/span><\/sub> = P\/U = 15\/12 \"\" <\/b><\/span><\/span>i<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> = 1,25 A<\/b><\/span><\/span><\/span> e <\/b><\/span><\/span>i<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> <\/b>= = P\/U = 15\/12 <\/b><\/span><\/span>= 1,25 A.<\/b><\/span><\/span><\/span><\/p>\n

B) <\/b><\/span><\/span>Falsa<\/b><\/span><\/span><\/span> \"\" Veja gr\u00e1fico \"\" <\/b><\/span><\/span>U<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> = U<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> = 12 V.<\/b><\/span><\/span><\/span><\/p>\n

C) <\/b><\/span><\/span>Correta<\/b><\/span><\/span><\/span> \"\" De (A), i<\/b><\/span><\/span>1<\/b><\/span><\/span><\/sub> = 1,25 A \"\" l\u00e2mpada 4 ou 5 \"\" R = U\/i<\/b><\/span><\/span>2<\/b><\/span><\/span><\/sub> \"\" 9,6 = 6\/i<\/b><\/span><\/span>2<\/b><\/span><\/span><\/sub> \"\" <\/b><\/span><\/span>i<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> = 6\/9,6 = 0,625 A<\/b><\/span><\/span><\/span><\/p>\n

D) <\/b><\/span><\/span>Falsa<\/b><\/span><\/span><\/span> \"\" veja B.<\/b><\/span><\/span><\/p>\n

E) Falsa \"\" veja gr\u00e1fico.<\/b><\/span><\/span><\/p>\n

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

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

\"\"<\/p>\n

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

09- <\/b><\/span><\/span><\/span>Objeto <\/b><\/span><\/span>entre o foco F e o v\u00e9rtice V ou entre o foco F e o espelho<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A <\/b><\/span><\/span>imagem ter\u00e1:<\/b><\/span><\/span><\/span><\/p>\n

Natureza \u2013 virtual<\/b><\/span><\/span><\/span> (obtida na interse\u00e7\u00e3o do prolongamento dos raios de luz ) \u2013 n\u00e3o pode ser projetada, fotografada, etc.<\/b><\/span><\/span><\/p>\n

Localiza\u00e7\u00e3o \u2013 atr\u00e1s do espelho<\/b><\/span><\/span><\/span><\/p>\n

Tamanho \u2013 maior que o do objeto<\/b><\/span><\/span><\/span><\/p>\n

Orienta\u00e7\u00e3o \u2013 direita em rela\u00e7\u00e3o ao objeto<\/b><\/span><\/span><\/span><\/p>\n

Utilidades:<\/b><\/span><\/span><\/span> s\u00e3o empregados com freq\u00fc\u00eancia quando se deseja obter uma <\/b><\/span><\/span>imagem virtual e ampliada<\/b><\/span><\/span><\/span> de um objeto, como \u00e9 o caso dos espelhos de barbear, toalete, de dentista, espelho de otorrinolaringologia, etc.<\/b><\/span><\/span><\/p>\n

R- E<\/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 a = (V \u2013 Vo)\/(t \u2013 to) = (10 \u2013 0)\/(10 \u2013 0) a = 10\/10 = 1 m\/s2. II. Verdadeira \u2206S = \u00e1rea do tri\u00e2ngulo = b.h\/2 = 10.10\/2 \u2206S = 50m. III. Falsa a velocidade varia (aumenta) uniformemente, mas a dist\u00e2ncia percorrida aumenta a cada segundo. IV. Falsa a acelera\u00e7\u00e3o \u00e9 constante a =<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":772,"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-774","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/774","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=774"}],"version-history":[{"count":1,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/774\/revisions"}],"predecessor-version":[{"id":775,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/774\/revisions\/775"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/772"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=774"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}