Answer
a. Positive
b. Positive
c. Zero
d. Negative
Work Step by Step
a, b. The system expands, increasing its volume. Equation 19.2 and Figure 19.6a show that the work done is positive.
c. The volume doesn’t change. Equation 19.2 and Figure 19.7c show that the work done is zero. There is no displacement.
d. The system is compressed, decreasing its volume. Equation 19.2 and Figure 19.6b show that the work done is negative.
