A thermodynamic system undergoes a process in which its internal energy decreases by 500 J. If the work done by the system is 750 J, the heat transferred to the system is
Q1. A thermodynamic system undergoes a process in which its internal energy decreases by 500 J. If the work done by the system is 750 J, the heat transferred to the system is
Answer: 250 J
Explanation: ΔU = Q - W, so Q = ΔU + W = -500 + 750 = 250 J. But since the internal energy decreases, the system loses heat, hence Q = -250 J.