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//kg C^@`. The atmospheric pressure is `1xx10 N//m^2`. The work done by the solid bar due to thermal expansion, under atmospheric pressure isA. 500 JB. 1000 JC. 1500 JD. 2000 J

The inernal energy of a solid also increases when heat is transferred

1.	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//kg C^@`. The atmospheric pressure is `1xx10 N//m^2`. The work done by the solid bar due to thermal expansion, under atmospheric pressure isA. 500 JB. 1000 JC. 1500 JD. 2000 J
Answer» Correct Answer - C `DeltaV=gammaVDeltaT` `=3alphaVDeltaT=3xx1xx10^-3xx((5kg)/((50kg)/(m^2)))xx50` `=15xx10^-3m^3` `W=PDeltaV` `=(1xx10^5(N)/(m^2))xx(15xx10^-3m^3)=15xx10^2` `=1500J`

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