21.
A copper ball of mass 100 gm is at a temperature T. It is dropped in a copper calorimeter of mass 100 gm, filled with 170 gm of water at room temperature. Subsequently, the temperature of the system is found to be 75oC. T is given by: (Given: room temperature=30oC, specific heat of copper=0.1 cal/gmoC)
A:
800oC
B:
885oC
C:
1250oC
D:
825oC
The answer is:
B
