When work is done by a system and heat is subtracted,the temperature of the system

Question

Quizplus · Accepted Answer

When work is done by a system and heat is subtracted, the internal energy of the system decreases. According to the first law of thermodynamics, 
ΔU = Q - W,
Where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system. If ΔU is negative (i.e., the internal energy decreases), and Q is negative (heat is subtracted), then W must be positive (work is done by the system). Therefore, the temperature of the system decreases as the system loses internal energy in the form of work done.

When Work Is Done by a System and Heat Is