Calculate the change in internal energy of a block of copper of mass 200 g when it is heated from 25^@ C to 75^@ C. Specific heat of copper = 0.1 cal /g/ ""^(@)C and assume change in volume is negligible.

Calculate the change in internal energy of a block of copper of mass 2

1.	Calculate the change in internal energy of a block of copper of mass 200 g when it is heated from 25^@ C to 75^@ C. Specific heat of copper = 0.1 cal /g/ ""^(@)C and assume change in volume is negligible.
Answer» SOLUTION :`DQ = cm DeltaT = 0.1 xx 200 ( 75-25) = 100` calorie ` DW = PDV =0` `dU = dQ - dW= 100-0 =100 ` calorie `= 4200 J`