P21 021

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21. The answers to this exercise do not depend on the engine being of the Carnot design. Any heat engine

that in-takes energy as heat (from, say, consuming fuel)equal to

|Q

H

| = 52 kJ and exhausts (or discards)

energy as heat equal to

|Q

L

| = 36 kJ will have these values of efficiency ε and net work W .

(a)Eq. 21-10 gives

ε = 1





Q

L

Q

H



 = 0.31 = 31% .

(b)Eq. 21-6 gives

W =

|Q

H

| − |Q

L

| = 16 J .


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