A perfectly insulated system has work done by it at a rate of 13 W.At what rate is the internal energy of the system changing?
A)- 13 W
B)13 W
C)0 W
D)6.5 W

Question

Quizplus · Accepted Answer

In a perfectly insulated system, there is no heat exchange with the surroundings. According to the first law of thermodynamics, the change in internal energy is equal to the heat added to the system minus the work done by the system. Since no heat is added, the change in internal energy is equal to the negative of the work done by the system, which is -13 W.

A Perfectly Insulated System Has Work Done by It at a Rate