The inernal energy of a solid also increases when heat is transferred to it from its surroundings. A 5 kg solid bar is heated at atmospheric pressure. Its temperature increases from `20^@C` to `70^@C`. The linear expansion coefficient of solid bar is `1xx10^(-3)//^(@)C`. The density of solid bar is `50 kg//m^3`. The specific heat capacity of solid bar is `200 J//kgC^@`. The atmospheric pressure is `1xx10N//m^2`.
The heat transferred to the solid bar is

Options

A. 49000 J
B. 50000 J
C. 50500 J
D. 51000 J

Answer

B

Explanation

`Q=mCDeltaT=(5kg)xx((200J)/(kg^@C))xx(50^@C)=50000J`