Question

In going from$i$to localid="1648790171714" $f$in each of the three processes of FIGURE Q21.1, is work done by the system localid="1648790168795" $\left(W<0,W_s>0\right)$is work done on the system , or is no net work done on the system localid="1648790176001" $\left(W>0,W_s<0\right)$or is no net work done?

Short answer

a. Work done is$W<0,W_s>0$.

b. Work done is$W>0,W_s<0$.

c. Work done is$W>0,W_s<0$.

Step-by-step solution

Work done (part a)

(a) Area under curve is positive. Work is done on the system.

Work done (part b)

(b) Since system is compresses, hence work is done on the system.

Work done (part c)

(c) Work is done on the system overall as clear from the graph since more work is done on the system than by the system.