Question

A circular disc was heated to 100 C from 20 C the initial radius war 5m. And coefficient of disc is given by 0.0007. Final the area, change in area and new area after expansion.

Answer 1

Answer:

here is your answer

Explanation:

Initial area A=π(35)

2

=3846.5cm

2

Change in area on heating ΔA=14.5cm

2

α=1.7×10

−5

We know that area expansion coefficient is twice of linear expansion coefficient.

So β=2α=2×1.7×10

−5

=3.4×10

−5

So ΔA=AβΔt

14.5=3846.5×3.4×10

−5

×ΔT

ΔT=110.8

o

C

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