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 increase in internal energy of a system is equal to the heat transferred to the system minus the work done by the system (ΔU = q - w). Therefore, to increase the internal energy, either more heat must be transferred to the system (q > 0) or less work must be done by the system (w < 0). Option B satisfies both of these conditions by having a positive heat transfer and positive work done by the system, resulting in an overall increase in internal energy.

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