RECUPERAÇÃO DE FÍSICA 2º ANO- 2013
Autor: Elicio Chaves | Publicado: 2014-01-13T13:50:00-08:00

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ITEM 1-: (PUC-RIO 2007) 

Uma chapa
quadrada, feita de um material encontrado no planeta Marte, tem área A = 100,0
cm² a uma temperatura de 100 ºC. A uma temperatura de 0,0 ºC, qual será a área
da chapa em cm²? 

Considere
que o coeficiente de expansão linear do material é α = 2,0 x 10−3 /
ºC.

a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 10 cm2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c) 100 cm2&nbsp;&nbsp;&nbsp;&nbsp; e) 200 cm2

b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 40 cm2&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;d)&nbsp;
60&nbsp;&nbsp; cm2 

ITEM 2- Um
quadrado de lado 2m é feito de um material cujo coeficiente de dilatação
superficial é igual a 1,6.10-4. Determine
a variação de área deste quadrado quando aquecido em 80°C.

a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
102 cm 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d)&nbsp; 0,1024 cm2

b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
204 cm 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; e) 4, 1024 cm2

c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
0,0142 cm2

ITEM 3- Sabendo que o coeficiente de dilatação linear do
ferro é 1,2.10-5, determine o coeficiente de dilatação superficial.

a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
4,8 .10 -5 0C

b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
2,8 .10 -5 0C

c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
2,4 .10 -5 0C

d)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
2,4

e)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
4,8

ITEM 4- Uma lâmina de ferro tem dimensões 10m x 15m em
temperatura normal. Ao ser aquecida 500ºC, qual será a área desta superfície?
Dado 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 

 


a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 150&nbsp; cm2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d)&nbsp;
1500 cm2

b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 151&nbsp; cm2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; e) 151,95 cm2

c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1300,1 cm2

ITEM 5- (VUNESP) A dilatação térmica dos sólidos é um
fenômeno importante em diversas aplicações de engenharia, como construções de
pontes, prédios e estradas de ferro. Considere o caso dos trilhos de trem serem
de aço, cujo coeficiente de dilatação é α = 11 .&nbsp;10-6&nbsp;°C-1.
Se a 10°C o comprimento de um trilho é de 30 m, de quanto aumentaria o seu
comprimento se a temperatura aumentasse para 40°C?

a) 11 . 10-4&nbsp;m
b) 33 .&nbsp;10-4&nbsp;m
c) 99 .&nbsp;10-4&nbsp;m
d) 132 .&nbsp;10-4&nbsp;m
e) 165 .&nbsp;10-4&nbsp;m


ITEM 6- Uma barra metálica tem, a 30°C,
comprimento igual a 1m. Eleva-se então sua temperatura para 1030°C. Sendo o
coeficiente de dilatação linear do metal da barra igual a 12 · 10-6
°C-1, determine a variação de comprimento sofrida pela barra.

a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
10 mm2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;d)&nbsp;
120 mm2

b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
100 m2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;e)&nbsp;&nbsp;
1200 mm2

c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
12 mm2
ITEM 7- Um recipiente de cobre tem 1 000 cm3 de
capacidade a 0 °C. Sua capacidade, a 100 °C, vale aproximadamente:


Dado: coeficiente de dilatação
linear do

&nbsp;cobre = 16 · 10–6 °C–1



a) 1 017 cm3

b) 1 005 cm3

c) 1 003 cm3

d) 1 002 cm3

e) 1 001 cm3