A system is acted on by its surroundings in such a way that it receives 80 J of heat while simultaneously doing 20 J of work.What is its net change in internal energy?
A)100 J
B)60 J
C)zero
D)−60 J
E)−100 J

Question

Quizplus · Accepted Answer

The net change in internal energy can be calculated using the first law of thermodynamics, which states that the change in internal energy (ΔU) is equal to the heat added to the system (Q) minus the work done by the system (W). In this case, ΔU = Q - W = 80 J - 20 J = 60 J.

A System Is Acted on by Its Surroundings in Such