{"id":824,"date":"2015-05-14T17:10:53","date_gmt":"2015-05-14T17:10:53","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=824"},"modified":"2024-09-02T17:48:52","modified_gmt":"2024-09-02T17:48:52","slug":"exercicios-resolvidos-da-ufrgs-2015","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/universidades-2015\/exercicios-resolvidos-da-ufrgs-2015\/","title":{"rendered":"Exerc\u00edcios Resolvidos da UFRGS 2015"},"content":{"rendered":"

UFRGS-2015<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

A\u00a0Universidade Federal do Rio Grande do Sul\u00a0(UFRGS) \u00e9 uma\u00a0institui\u00e7\u00e3o de ensino superior\u00a0p\u00fablica\u00a0brasileira, mantida pelo\u00a0Governo Federal do Brasil. Est\u00e1 situada em\u00a0Porto Alegre,\u00a0capital\u00a0do\u00a0Rio Grande do Sul.<\/b><\/span><\/span><\/span><\/p>\n

A UFRGS mant\u00e9m centros de\u00a0gradua\u00e7\u00e3o\u00a0e\u00a0p\u00f3s-gradua\u00e7\u00e3o\u00a0nas \u00e1reas de\u00a0educa\u00e7\u00e3o<\/b><\/span><\/span><\/span><\/p>\n

,letras,\u00a0engenharias,\u00a0ci\u00eancias exatas\u00a0e\u00a0ci\u00eancias humanas. A UFRGS \u00e9 inovadora na cria\u00e7\u00e3o de cursos de p\u00f3s-gradua\u00e7\u00e3o em n\u00edvel de especializa\u00e7\u00e3o e mestrado profissional (MBA) no \u00e2mbito das universidades p\u00fablicas brasileiras.<\/b><\/span><\/span><\/span><\/p>\n

A UFRGS est\u00e1 na lista das melhores institui\u00e7\u00f5es educacionais de\u00a0ensino superior\u00a0do mundo, elaborada pela\u00a0Shanghai Jiao Tong University, onde foram analisadas 12 mil institui\u00e7\u00f5es em todo o mundo.<\/b><\/span><\/span><\/span><\/p>\n

Em outro ranking, organizado pelo Minist\u00e9rio da Educa\u00e7\u00e3o da\u00a0Espanha, a Universidade Federal do Rio Grande do Sul aparece em 152\u00b0 lugar, entre 17 mil institui\u00e7\u00f5es pesquisadas. O \u00edndice leva em conta a qualidade das pesquisas acad\u00eamicas e o prest\u00edgio em \u00e2mbito internacional. Na mesma lista a UFRGS aparece na 3\u00aa posi\u00e7\u00e3o entre as melhores da Am\u00e9rica Latina.<\/b><\/span><\/span><\/span><\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>Hospital de Cl\u00ednicas de Porto Alegre (HCPA)<\/b><\/span><\/span><\/span><\/a>\u00a0faz parte da rede de hospitais universit\u00e1rios do Minist\u00e9rio da Educa\u00e7\u00e3o e \u00e9 vinculado academicamente \u00e0 Universidade Federal do Rio Grande do Sul (UFRGS). O Hospital \u00e9 refer\u00eancia em todo Brasil e est\u00e1 localizado no centro de\u00a0<\/b><\/span><\/span><\/span>Porto Alegre<\/b><\/span><\/span><\/span><\/a>.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

01-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Em 2014, comemoraram-se os 50 anos do in\u00edcio da opera\u00e7\u00e3o de <\/b><\/span><\/span><\/span>trens de alta velocidade no Jap\u00e3o, os chamados trens-bala. <\/b><\/span><\/span><\/span><\/p>\n

Considere que <\/b><\/span><\/span><\/span>um <\/b><\/span><\/span><\/span>desses trens desloca-se com uma <\/b><\/span><\/span><\/span>velocidade constante de 360 km\/h<\/b><\/span><\/span><\/span> sobre<\/b><\/span><\/span><\/span><\/p>\n

trilhos horizontais<\/b><\/span><\/span><\/span>. Em um <\/b><\/span><\/span><\/span>trilho paralelo<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span><\/span>outro trem<\/b><\/span><\/span><\/span> desloca-se tamb\u00e9m com <\/b><\/span><\/span><\/span>velocidade constante<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

de 360 km\/h, por\u00e9m em sentido contr\u00e1rio.<\/b><\/span><\/span><\/span><\/p>\n

Nesse caso, o <\/b><\/span><\/span><\/span>m\u00f3dulo da velocidade relativa<\/b><\/span><\/span><\/span> dos trens, <\/b><\/span><\/span><\/span>em m\/s<\/b><\/span><\/span><\/span>, \u00e9 igual a<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

02-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Trens MAGLEV<\/b><\/span><\/span><\/span>, que t\u00eam como princ\u00edpio de funcionamento a <\/b><\/span><\/span><\/span>suspens\u00e3o eletromagn\u00e9tica,<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

entrar\u00e3o em opera\u00e7\u00e3o comercial no Jap\u00e3o, nos pr\u00f3ximos anos. Eles podem atingir velocidades superiores a 550 km\/h. Considere que um trem, partindo do repouso e movendo-se sobre um <\/b><\/span><\/span><\/span>trilho retil\u00edneo, \u00e9 uniformemente acelerado durante 2,5 minutos at\u00e9 atingir 540 km\/h.<\/b><\/span><\/span><\/span><\/p>\n

Nessas condi\u00e7\u00f5es, a acelera\u00e7\u00e3o do trem, em m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>, \u00e9<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

03-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Em uma regi\u00e3o onde a <\/b><\/span><\/span><\/span>acelera\u00e7\u00e3o da gravidade tem m\u00f3dulo constante<\/b><\/span><\/span><\/span>, um <\/b><\/span><\/span><\/span>proj\u00e9til \u00e9 disparado<\/b><\/span><\/span><\/span> a <\/b><\/span><\/span><\/span>partir do solo<\/b><\/span><\/span><\/span>, em uma dire\u00e7\u00e3o que faz um <\/b><\/span><\/span><\/span>\u00e2ngulo \u03b1 com a dire\u00e7\u00e3o horizontal<\/b><\/span><\/span><\/span>, conforme representado na figura abaixo.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Assinale a op\u00e7\u00e3o<\/b><\/span><\/span><\/span> que, <\/b><\/span><\/span><\/span>desconsiderando a resist\u00eancia do<\/b><\/span><\/span><\/span> ar, indica os gr\u00e1ficos que melhor<\/b><\/span><\/span><\/span><\/p>\n

representam, respectivamente<\/b><\/span><\/span><\/span>, o comportamento da <\/b><\/span><\/span><\/span>componente horizontal e o da componente<\/b><\/span><\/span><\/span><\/p>\n

vertical, da velocidade do proj\u00e9til, em fun\u00e7\u00e3o do tempo.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

04-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>elipse<\/b><\/span><\/span><\/span>, na figura abaixo, representa a <\/b><\/span><\/span><\/span>\u00f3rbita de um planeta<\/b><\/span><\/span><\/span> em torno de uma estrela S. Os<\/b><\/span><\/span><\/span><\/p>\n

pontos ao longo da elipse<\/b><\/span><\/span><\/span> representam <\/b><\/span><\/span><\/span>posi\u00e7\u00f5es sucessivas do planeta<\/b><\/span><\/span><\/span>, separadas por <\/b><\/span><\/span><\/span>intervalos de<\/b><\/span><\/span><\/span> <\/b>tempo iguais<\/b><\/span><\/span><\/span>. As regi\u00f5es alternadamente coloridas representam as \u00e1reas varridas pelo raio da trajet\u00f3ria nesses intervalos de tempo. Na figura, em que as dimens\u00f5es dos astros e o tamanho da \u00f3rbita n\u00e3o est\u00e3o em escala, o <\/b><\/span><\/span><\/span>segmento de reta SH representa o raio focal do ponto H, de comprimento p .<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Considerando que a <\/b><\/span><\/span><\/span>\u00fanica for\u00e7a atuante no sistema estrela-planeta seja a for\u00e7a gravitacional<\/b><\/span><\/span><\/span>, s\u00e3o feitas as <\/b><\/span><\/span><\/span>seguintes afirma\u00e7\u00f5es.<\/b><\/span><\/span><\/span><\/p>\n

I –<\/b><\/span><\/span><\/span> As \u00e1reas S<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> e S<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>, varridas pelo raio da trajet\u00f3ria, s\u00e3o iguais.<\/b><\/span><\/span><\/span><\/p>\n

II –<\/b><\/span><\/span><\/span> O per\u00edodo da \u00f3rbita \u00e9 proporcional a <\/b><\/span><\/span><\/span>p<\/b><\/i><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span> .<\/b><\/span><\/span><\/span><\/p>\n

III-<\/b><\/span><\/span><\/span> As velocidades tangenciais do planeta nos pontos A e H, V<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> e V<\/b><\/span><\/span><\/span>H<\/b><\/span><\/span><\/sub><\/span>, s\u00e3o tais que V<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> > V<\/b><\/span><\/span><\/span>H<\/b><\/span><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

Quais est\u00e3o corretas?<\/b><\/span><\/span><\/span><\/p>\n

(A)<\/b><\/span><\/span><\/span> Apenas I.<\/b><\/span><\/span><\/span><\/p>\n

(B)<\/b><\/span><\/span><\/span> Apenas I e II.<\/b><\/span><\/span><\/span><\/p>\n

(C)<\/b><\/span><\/span><\/span> Apenas I e III.<\/b><\/span><\/span><\/span><\/p>\n

(D)<\/b><\/span><\/span><\/span> Apenas II e III.<\/b><\/span><\/span><\/span><\/p>\n

(E)<\/b><\/span><\/span><\/span> I, II e III.<\/b><\/span><\/span><\/span><\/p>\n

05-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>carrinho de massa 1 kg<\/b><\/span><\/span><\/span> move-se <\/b><\/span><\/span><\/span>retilineamente com velocidade de m\u00f3dulo constante<\/b><\/span><\/span><\/span> igual a <\/b><\/span><\/span><\/span>3 m\/s<\/b><\/span><\/span><\/span>, sobre uma <\/b><\/span><\/span><\/span>superf\u00edcie horizontal sem atrito. <\/b><\/span><\/span><\/span><\/p>\n

A partir de <\/b><\/span><\/span><\/span>dado instante<\/b><\/span><\/span><\/span>, o carrinho recebe o <\/b><\/span><\/span><\/span>impulso de uma for\u00e7a <\/b><\/span><\/span><\/span>externa aplicada na <\/b><\/span><\/span><\/span>mesma dire\u00e7\u00e3o e sentido de seu movimento<\/b><\/span><\/span><\/span>. A <\/b><\/span><\/span><\/span>intensidade dessa for\u00e7a<\/b><\/span><\/span><\/span>, em fun\u00e7\u00e3o do t<\/b><\/span><\/span><\/span>empo<\/b><\/span><\/span><\/span>, \u00e9 dada pelo gr\u00e1fico abaixo.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>partir desse gr\u00e1fico<\/b><\/span><\/span><\/span>, pode-se afirmar que o <\/b><\/span><\/span><\/span>m\u00f3dulo da velocidade do bloco ap\u00f3s o impulso recebido \u00e9, em m\/s, de<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

06-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Dois blocos, 1 e 2<\/b><\/span><\/span><\/span>, s\u00e3o arranjados de <\/b><\/span><\/span><\/span>duas maneiras distintas<\/b><\/span><\/span><\/span> e empurrados sobre uma superf\u00edcie <\/b><\/span><\/span><\/span>sem atrito<\/b><\/span><\/span><\/span>, por uma <\/b><\/span><\/span><\/span>mesma for\u00e7a horizontal <\/b><\/span><\/span><\/span>F<\/b><\/span><\/span><\/span>. As situa\u00e7\u00f5es est\u00e3o representadas nas figuras <\/b><\/span><\/span><\/span>I e II<\/b><\/span><\/span><\/span> abaixo.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Considerando que a <\/b><\/span><\/span><\/span>massa do bloco 1 \u00e9 m<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> e que a <\/b><\/span><\/span><\/span>massa do bloco 2 \u00e9 m<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> = 3 m<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>, a <\/b><\/span><\/span><\/span>op\u00e7\u00e3o<\/b><\/span><\/span><\/span> que indica <\/b><\/span><\/span><\/span>corretamente a intensidade da for\u00e7a que atua entre os blocos, nas situa\u00e7\u00f5es I e II, <\/b><\/span><\/span><\/span>\u00e9, respectivamente,<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Instru\u00e7\u00e3o<\/b><\/span><\/span><\/span>:<\/b><\/span><\/span><\/span> As quest\u00f5es <\/b><\/span><\/span><\/span>07 <\/b><\/span><\/span><\/span>e <\/b><\/span><\/span><\/span>08<\/b><\/span><\/span><\/span> <\/b>referem-se ao enunciado abaixo.<\/b><\/span><\/span><\/span><\/p>\n

Na <\/b><\/span><\/span><\/span>figura abaixo<\/b><\/span><\/span><\/span>, est\u00e3o representados <\/b><\/span><\/span><\/span>dois p\u00eandulos simples, X e Y, de massas iguais a 100 g.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Os <\/b><\/span><\/span><\/span>p\u00eandulos<\/b><\/span><\/span><\/span>, cujas hastes t\u00eam massas desprez\u00edveis, encontram-se no <\/b><\/span><\/span><\/span>campo gravitacional terrestre.<\/b><\/span><\/span><\/span> O <\/b><\/span><\/span><\/span>p\u00eandulo Y <\/b><\/span><\/span><\/span>encontra-se em <\/b><\/span><\/span><\/span>repouso<\/b><\/span><\/span><\/span> quando o <\/b><\/span><\/span><\/span>p\u00eandulo X \u00e9 liberado de uma altura h = 0,2 m em rela\u00e7\u00e3o a ele.<\/b><\/span><\/span><\/span><\/p>\n

Considere o m\u00f3dulo da <\/b><\/span><\/span><\/span>acelera\u00e7\u00e3o da gravidade g = 10 m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

07-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Ap\u00f3s a colis\u00e3o, X e Y<\/b><\/span><\/span><\/span> passam a <\/b><\/span><\/span><\/span>mover-se juntos<\/b><\/span><\/span><\/span>, formando um \u00fanico p\u00eandulo de <\/b><\/span><\/span><\/span>massa 200 g<\/b><\/span><\/span><\/span>. Se <\/b><\/span><\/span><\/span>v \u00e9 a velocidade do p\u00eandulo X no instante da colis\u00e3o<\/b><\/span><\/span><\/span>, o m\u00f3dulo da <\/b><\/span><\/span><\/span>velocidade do p\u00eandulo de massa 200 g, imediatamente ap\u00f3s a colis\u00e3o, \u00e9<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

08-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Qual foi <\/b><\/span><\/span><\/span>o trabalho realizado pelo campo gravitacional sobre o p\u00eandulo X<\/b><\/span><\/span><\/span>, desde que foi<\/b><\/span><\/span><\/span><\/p>\n

liberado<\/b><\/span><\/span><\/span> at\u00e9 o instante da <\/b><\/span><\/span><\/span>colis\u00e3o?<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

09-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Observe o <\/b><\/span><\/span><\/span>sistema<\/b><\/span><\/span><\/span> formado por um <\/b><\/span><\/span><\/span>bloco de massa m<\/b><\/span><\/span><\/span> comprimindo uma <\/b><\/span><\/span><\/span>mola de constante k<\/b><\/span><\/span><\/span>, representado na figura abaixo.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Considere a mola como sem massa e o <\/b><\/span><\/span><\/span>coeficiente de atrito cin\u00e9tico<\/b><\/span><\/span><\/span> entre o bloco e a superf\u00edcie igual a <\/b><\/span><\/span><\/span>\u03bc<\/b><\/span><\/span><\/span>c<\/b><\/span><\/span><\/sub><\/span> .<\/b><\/span><\/span><\/span><\/p>\n

Qual deve ser a <\/b><\/span><\/span><\/span>compress\u00e3o X da mola<\/b><\/span><\/span><\/span> para que o bloco <\/b><\/span><\/span><\/span>deslize<\/b><\/span><\/span><\/span> sem rolar sobre a superf\u00edcie horizontal e <\/b><\/span><\/span><\/span>pare no ponto distante 4X da posi\u00e7\u00e3o de equil\u00edbrio da mola?<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

10-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/span><\/p>\n

Assinale a <\/b><\/span><\/span><\/span>alternativa que preenche corretamente as lacunas<\/b><\/span><\/span><\/span> do enunciado abaixo, na <\/b><\/span><\/span><\/span>ordem em que aparecem.<\/b><\/span><\/span><\/span><\/p>\n

Dois objetos<\/b><\/span><\/span><\/span>, R e S<\/b><\/span><\/span><\/span>, cujos <\/b><\/span><\/span><\/span>volumes s\u00e3o iguais, s\u00e3o feitos do mesmo material.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

\"\"<\/p>\n

R t<\/b><\/span><\/span><\/span>em a forma <\/b><\/span><\/span><\/span>c\u00fabica <\/b><\/span><\/span><\/span>e <\/b><\/span><\/span><\/span>S <\/b><\/span><\/span><\/span>a forma <\/b><\/span><\/span><\/span>esf\u00e9rica.<\/b><\/span><\/span><\/span> Se <\/b><\/span><\/span><\/span>R \u00e9 maci\u00e7o e S \u00e9 oco<\/b><\/span><\/span><\/span>, seus respectivos <\/b><\/span><\/span><\/span>pesos P<\/b><\/span><\/span><\/span>R<\/b><\/span><\/span><\/sub><\/span> e P<\/b><\/span><\/span><\/span>S<\/b><\/span><\/span><\/sub><\/span> s\u00e3o <\/b><\/span><\/span><\/span>tais que<\/b><\/span><\/span><\/span> ……… .<\/b><\/span><\/span><\/span><\/p>\n

Quando mantidos <\/b><\/span><\/span><\/span>totalmente submersos em \u00e1gua<\/b><\/span><\/span><\/span>, a for\u00e7a de <\/b><\/span><\/span><\/span>empuxo E<\/b><\/span><\/span><\/span>R <\/b><\/span><\/span><\/sub><\/span>exercida sobre R<\/b><\/span><\/span><\/span> \u00e9 …….. <\/b><\/span><\/span><\/span>for\u00e7a de empuxo E<\/b><\/span><\/span><\/span>S <\/b><\/span><\/span><\/sub><\/span>exercida sobre S<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

(A)<\/b><\/span><\/span><\/span> P<\/b><\/span><\/span><\/span>R<\/b><\/span><\/span><\/sub><\/span> > P<\/b><\/span><\/span><\/span>S <\/b><\/span><\/span><\/sub><\/span>\u2013 maior do que a<\/b><\/span><\/span><\/span><\/p>\n

(B)<\/b><\/span><\/span><\/span> P<\/b><\/span><\/span><\/span> R<\/b><\/span><\/span><\/sub><\/span> > P<\/b><\/span><\/span><\/span>S<\/b><\/span><\/span><\/sub><\/span> \u2013 igual \u00e0<\/b><\/span><\/span><\/span><\/p>\n

(C)<\/b><\/span><\/span><\/span> P<\/b><\/span><\/span><\/span> R<\/b><\/span><\/span><\/sub><\/span> > P<\/b><\/span><\/span><\/span>S<\/b><\/span><\/span><\/sub><\/span> \u2013 menor do que a<\/b><\/span><\/span><\/span><\/p>\n

(D)<\/b><\/span><\/span><\/span> P<\/b><\/span><\/span><\/span> R<\/b><\/span><\/span><\/sub><\/span> = P<\/b><\/span><\/span><\/span>S<\/b><\/span><\/span><\/sub><\/span> \u2013 maior do que a<\/b><\/span><\/span><\/span><\/p>\n

(E)<\/b><\/span><\/span><\/span> P<\/b><\/span><\/span><\/span> R<\/b><\/span><\/span><\/sub><\/span> = P<\/b><\/span><\/span><\/span>S<\/b><\/span><\/span><\/sub><\/span> \u2013 igual \u00e0<\/b><\/span><\/span><\/span><\/p>\n

RL<\/b><\/span><\/span><\/span><\/p>\n

11-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>figura abaixo<\/b><\/span><\/span><\/span> apresenta um <\/b><\/span><\/span><\/span>diagrama Press\u00e3o x Volume<\/b><\/span><\/span><\/span>. Nele, os <\/b><\/span><\/span><\/span>pontos M, N e R<\/b><\/span><\/span><\/span> representam <\/b><\/span><\/span><\/span>tr\u00eas estados<\/b><\/span><\/span><\/span> de uma <\/b><\/span><\/span><\/span>mesma<\/b><\/span><\/span><\/span> amostra de <\/b><\/span><\/span><\/span>g\u00e1s ideal.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Assinale a <\/b><\/span><\/span><\/span>alternativa <\/b><\/span><\/span><\/span>que indica <\/b><\/span><\/span><\/span>corretamente a rela\u00e7\u00e3o entre as temperaturas absolutas T<\/b><\/span><\/span><\/span>M<\/b><\/span><\/span><\/sub><\/span>, T<\/b><\/span><\/span><\/span>N<\/b><\/span><\/span><\/sub><\/span> e T<\/b><\/span><\/span><\/span>R<\/b><\/span><\/span><\/sub><\/span> dos respectivos <\/b><\/span><\/span><\/span>estados M, N e R.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

12-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Em uma aula de F\u00edsica, foram utilizadas duas esferas met\u00e1licas id\u00eanticas, X e Y: X est\u00e1 suspensa por um fio isolante na forma de um p\u00eandulo e Y fixa sobre um suporte isolante, conforme representado na figura abaixo. <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

As esferas encontram-se inicialmente afastadas, estando X positivamente carregada e Y eletricamente neutra.<\/b><\/span><\/span><\/span><\/p>\n

Considere a descri\u00e7\u00e3o, abaixo, de dois procedimentos simples para demonstrar poss\u00edveis processos de eletriza\u00e7\u00e3o e, em seguida, assinale a alternativa que preenche corretamente as lacunas dos enunciados, na ordem em que aparecem.<\/b><\/span><\/span><\/span><\/p>\n

I – A esfera Y \u00e9 aproximada de X, sem que elas se toquem. Nesse caso, verifica-se experimentalmente que a esfera X \u00e9 …….. pela esfera Y.<\/b><\/span><\/span><\/span><\/p>\n

II – A esfera Y \u00e9 aproximada de X, sem que elas se toquem. Enquanto mantida nessa posi\u00e7\u00e3o, faz-se uma liga\u00e7\u00e3o da esfera Y com a terra, usando um fio condutor.<\/b><\/span><\/span><\/span><\/p>\n

Ainda nessa posi\u00e7\u00e3o pr\u00f3xima de X, interrompe-se o contato de Y com a terra e, ent\u00e3o, afasta-se novamente Y de X.<\/b><\/span><\/span><\/span><\/p>\n

Nesse caso, a esfera Y fica …….. .<\/b><\/span><\/span><\/span><\/p>\n

(A) atra\u00edda \u2013 eletricamente neutra<\/b><\/span><\/span><\/span><\/p>\n

(B) atra\u00edda \u2013 positivamente carregada<\/b><\/span><\/span><\/span><\/p>\n

(C) atra\u00edda \u2013 negativamente carregada<\/b><\/span><\/span><\/span><\/p>\n

(D) repelida \u2013 positivamente carregada<\/b><\/span><\/span><\/span><\/p>\n

(E) repelida \u2013<\/b><\/span><\/span><\/span> negativamente carregada<\/b><\/span><\/span><\/p>\n

13-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

No circuito esquematizado abaixo, R1 e R2 s\u00e3o resistores com a mesma resistividade \u03c1.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

R1 tem comprimento 2L e se\u00e7\u00e3o transversal A, e R2 tem comprimento L e se\u00e7\u00e3o transversal 2A.<\/b><\/span><\/span><\/span><\/p>\n

Nessa situa\u00e7\u00e3o, a corrente el\u00e9trica que percorre o circuito \u00e9<\/b><\/span><\/span><\/span><\/p>\n

(A) 2AV\/(5 \u03c1 L). (B) 2AV\/(3 \u03c1 L). (C) AV\/( \u03c1 L). (D) 3AV\/(2\u03c1 L). (E) 5AV\/(2 \u03c1 L).<\/b><\/span><\/span><\/span><\/p>\n

14-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Part\u00edculas \u03b1, \u03b2 e \u03b3<\/b><\/span><\/span><\/span> s\u00e3o emitidas por uma <\/b><\/span><\/span><\/span>fonte radioativa<\/b><\/span><\/span><\/span> e penetram em uma <\/b><\/span><\/span><\/span>regi\u00e3o do espa\u00e7o<\/b><\/span><\/span><\/span> onde existe um <\/b><\/span><\/span><\/span>campo magn\u00e9tico uniforme<\/b><\/span><\/span><\/span>. As <\/b><\/span><\/span><\/span>trajet\u00f3rias<\/b><\/span><\/span><\/span> s\u00e3o <\/b><\/span><\/span><\/span>coplanares<\/b><\/span><\/span><\/span> com o plano desta p\u00e1gina e est\u00e3o representadas na <\/b><\/span><\/span><\/span>figura <\/b><\/span><\/span><\/span>que segue.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Assinale a alternativa que <\/b><\/span><\/span><\/span>preenche corretamente a lacuna<\/b><\/span><\/span><\/span> do enunciado abaixo.<\/b><\/span><\/span><\/span><\/p>\n

A <\/b><\/span><\/span><\/span>julgar<\/b><\/span><\/span><\/span> pelas <\/b><\/span><\/span><\/span>trajet\u00f3rias representadas<\/b><\/span><\/span><\/span> na figura acima, o <\/b><\/span><\/span><\/span>campo magn\u00e9tico<\/b><\/span><\/span><\/span> …….. <\/b><\/span><\/span><\/span>plano da figura.<\/b><\/span><\/span><\/span><\/p>\n

(A)<\/b><\/span><\/span><\/span> aponta no sentido positivo do eixo X, no<\/b><\/span><\/span><\/span><\/p>\n

(B)<\/b><\/span><\/span><\/span> aponta no sentido negativo do eixo X, no<\/b><\/span><\/span><\/span><\/p>\n

(C)<\/b><\/span><\/span><\/span> aponta no sentido positivo do eixo Y, no<\/b><\/span><\/span><\/span><\/p>\n

(D)<\/b><\/span><\/span><\/span> entra perpendicularmente no<\/b><\/span><\/span><\/span><\/p>\n

(E)<\/b><\/span><\/span><\/span> sai perpendicularmente do<\/b><\/span><\/span><\/span><\/p>\n

15-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Na figura abaixo, um <\/b><\/span><\/span>raio luminoso i<\/b><\/span><\/span><\/span>, propagando-se no <\/b><\/span><\/span>ar<\/b><\/span><\/span><\/span>, incide <\/b><\/span><\/span>radialmente sobre uma placa semicircular de vidro.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Assinale a alternativa que <\/b><\/span><\/span>melhor representa a trajet\u00f3ria dos raios r<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> e r<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> refratados,<\/b><\/span><\/span><\/span><\/p>\n

respectivamente, no vidro e no ar.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

RL<\/b><\/span><\/span><\/p>\n

16-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>campo magn\u00e9tico uniforme <\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/span> <\/b>atravessa <\/b><\/span><\/span><\/span>perpendicularmente o plano do circuito<\/b><\/span><\/span><\/span> representado abaixo, <\/b><\/span><\/span><\/span>direcionado para fora desta p\u00e1gina.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O <\/b><\/span><\/span><\/span>fluxo <\/b><\/span><\/span><\/span>desse campo atrav\u00e9s do circuito <\/b><\/span><\/span><\/span>aumenta \u00e0 taxa de 1 Wb\/s.<\/b><\/span><\/span><\/span><\/p>\n

Nessa situa\u00e7\u00e3o, a leitura do amper\u00edmetro A apresenta, em amp\u00e8res,<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

(Lei de Faraday<\/b><\/span><\/span><\/span> \"\" m\u00f3dulo da varia\u00e7\u00e3o de fluxo = for\u00e7a eletromotriz\/intervalo de tempo \"\" \u0399\u0424I = E\/\u2206t \"\" 1Wb\/s = E\/1s \"\" <\/b><\/span><\/span><\/span>E = 1 V<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

17-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Na <\/b><\/span><\/span>figura abaixo<\/b><\/span><\/span><\/span>, est\u00e3o representadas <\/b><\/span><\/span>duas ondas transversais P e Q<\/b><\/span><\/span><\/span>, em um <\/b><\/span><\/span>dado<\/b><\/span><\/span><\/span> instante de tempo.<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

Considere que as <\/b><\/span><\/span>velocidades de propaga\u00e7\u00e3o das ondas s\u00e3o iguais.<\/b><\/span><\/span><\/span><\/p>\n

Sobre essa <\/b><\/span><\/span>representa\u00e7\u00e3o das ondas P e Q, s\u00e3o feitas as seguintes afirma\u00e7\u00f5es.<\/b><\/span><\/span><\/span><\/p>\n

I –<\/b><\/span><\/span><\/span> A onda P tem o dobro da amplitude da onda Q.<\/b><\/span><\/span><\/p>\n

II –<\/b><\/span><\/span><\/span> A onda P tem o dobro do comprimento de onda da onda Q.<\/b><\/span><\/span><\/p>\n

III-<\/b><\/span><\/span><\/span> A onda P tem o dobro da frequ\u00eancia da onda Q.<\/b><\/span><\/span><\/p>\n

Quais est\u00e3o corretas?<\/b><\/span><\/span><\/span><\/p>\n

(A)<\/b><\/span><\/span><\/span> Apenas I.<\/b><\/span><\/span><\/p>\n

(B)<\/b><\/span><\/span><\/span> Apenas II.<\/b><\/span><\/span><\/p>\n

(C)<\/b><\/span><\/span><\/span> Apenas III.<\/b><\/span><\/span><\/p>\n

(D)<\/b><\/span><\/span><\/span> Apenas I e II.<\/b><\/span><\/span><\/p>\n

(E)<\/b><\/span><\/span><\/span> I, II e III.<\/b><\/span><\/span><\/p>\n

18-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Assinale a alternativa<\/b><\/span><\/span><\/span> que preenche <\/b><\/span><\/span>corretamente<\/b><\/span><\/span><\/span> as <\/b><\/span><\/span>lacunas <\/b><\/span><\/span><\/span>do enunciado abaixo, na <\/b><\/span><\/span>ordem em que aparecem.<\/b><\/span><\/span><\/span><\/p>\n

A <\/b><\/span><\/span>incid\u00eancia de radia\u00e7\u00e3o eletromagn\u00e9tica<\/b><\/span><\/span><\/span> sobre uma <\/b><\/span><\/span>superf\u00edcie met\u00e1lica pode arrancar el\u00e9trons dessa superf\u00edcie.<\/b><\/span><\/span><\/span><\/p>\n

O <\/b><\/span><\/span>fen\u00f4meno<\/b><\/span><\/span><\/span> \u00e9 conhecido como …….. e <\/b><\/span><\/span>s\u00f3 <\/b><\/span><\/span><\/span>pode ser explicado <\/b><\/span><\/span>satisfatoriamente invocando a natureza<\/b><\/span><\/span><\/span> …….. <\/b><\/span><\/span>da luz.<\/b><\/span><\/span><\/span><\/p>\n

(A)<\/b><\/span><\/span><\/span> efeito fotoel\u00e9trico \u2013 ondulat\u00f3ria<\/b><\/span><\/span><\/p>\n

(B)<\/b><\/span><\/span><\/span> efeito Coulomb \u2013 corpuscular<\/b><\/span><\/span><\/p>\n

(C)<\/b><\/span><\/span><\/span> efeito Joule \u2013 corpuscular<\/b><\/span><\/span><\/p>\n

(D)<\/b><\/span><\/span><\/span> efeito fotoel\u00e9trico \u2013 corpuscular<\/b><\/span><\/span><\/p>\n

(E)<\/b><\/span><\/span><\/span> efeito Coulomb \u2013 ondulat\u00f3ria<\/b><\/span><\/span><\/p>\n

19-(UFRGS-RS-015)<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O f\u00edsico franc\u00eas <\/b><\/span><\/span><\/span>Louis de Broglie<\/b><\/span><\/span><\/span> (1892-1987), em analogia ao comportamento dual onda-part\u00edcula<\/b><\/span><\/span><\/span><\/p>\n

da luz, <\/b><\/span><\/span><\/span>atribuiu propriedades ondulat\u00f3rias \u00e0 mat\u00e9ria.<\/b><\/span><\/span><\/span><\/p>\n

Sendo a <\/b><\/span><\/span><\/span>constante de Planck h = 6,6.10<\/b><\/span><\/span><\/span>-34<\/b><\/span><\/span><\/sup><\/span> J.s,<\/b><\/span><\/span><\/span> o <\/b><\/span><\/span><\/span>comprimento de onda de Broglie<\/b><\/span><\/span><\/span> para um <\/b><\/span><\/span><\/span>el\u00e9tron<\/b><\/span><\/span><\/span><\/p>\n

(massa m = 9.10<\/b><\/span><\/span><\/span>-31<\/b><\/span><\/span><\/sup><\/span> kg) com velocidade de m\u00f3dulo v = 2,2.10<\/b><\/span><\/span><\/span>6<\/b><\/span><\/span><\/sup><\/span> m\/s \u00e9, aproximadamente,<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

<\/h2>\n

Confira a resolu\u00e7\u00e3o comentada.<\/span><\/a><\/h2>\n","protected":false},"excerpt":{"rendered":"

UFRGS-2015 A\u00a0Universidade Federal do Rio Grande do Sul\u00a0(UFRGS) \u00e9 uma\u00a0institui\u00e7\u00e3o de ensino superior\u00a0p\u00fablica\u00a0brasileira, mantida pelo\u00a0Governo Federal do Brasil. Est\u00e1 situada em\u00a0Porto Alegre,\u00a0capital\u00a0do\u00a0Rio Grande do Sul. A UFRGS mant\u00e9m centros de\u00a0gradua\u00e7\u00e3o\u00a0e\u00a0p\u00f3s-gradua\u00e7\u00e3o\u00a0nas \u00e1reas de\u00a0educa\u00e7\u00e3o ,letras,\u00a0engenharias,\u00a0ci\u00eancias exatas\u00a0e\u00a0ci\u00eancias humanas. A UFRGS \u00e9 inovadora na cria\u00e7\u00e3o de cursos de p\u00f3s-gradua\u00e7\u00e3o em n\u00edvel de especializa\u00e7\u00e3o e mestrado profissional (MBA) no \u00e2mbito das universidades p\u00fablicas brasileiras. A<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":5,"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-824","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/824","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=824"}],"version-history":[{"count":2,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/824\/revisions"}],"predecessor-version":[{"id":828,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/824\/revisions\/828"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/5"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=824"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}