The following diagrams illustrate the flow of energy (q)and work (w)in different processes.In which ones does the internal energy of the system DEFINITELY increase? Assume the magnitudes of q and w are equal.
E)none of these

Question

Quizplus · Accepted Answer

In process C, the work done on the system is less than the heat added to the system, so the internal energy of the system must increase. In processes A, B, and D, the magnitudes of q and w are equal, so there is no net change in internal energy. Therefore, the internal energy definitely increases in process C only.

The Following Diagrams Illustrate the Flow of Energy (Q)and Work