According to the first law of thermodynamics, which of the changes A-D will always increase the internal energy of a system? (q = energy transferred, and w = work done)

Question

Quizplus · Accepted Answer

According to the first law of thermodynamics, the change in internal energy of a system is given by ΔU = q - w, where q is the heat transferred to the system and w is the work done by the system. If q > 0 and w > 0, then ΔU > 0, which means the internal energy of the system has increased. Therefore, option B, where both q and w are greater than zero, is the only option that will always increase the internal energy of the system.

According to the First Law of Thermodynamics, Which of the Changes