Question

5
A soled sphere of copper weighs
Ikg find the increase in its surface
area when its temperature rises
from 15 c to soooc. Relalive density
of copper at ooc is 8.98. L=16.07810/​

Answer 1

Answer:

Given,

α=16.07×10

−6

/

0

C

ΔT=500−15=485

0

C

The increase in it's surface area when temperature changes.

From thermal expansion formula for area,

ΔA=α

A

.ΔT. . .. .(1)

We know that, α

A

=2α

l

ΔA=αΔT

ΔA=16.07×10

−6

×485

ΔA=7.8×10

−3

m

2