Question

In each cycle of its operation, a heat engine expels 6,100 J of energy and performs 1,300 J of mechanical work.
(a) How much thermal energy must be added to the engine in each cycle? (J)

(b) Find the thermal efficiency of the engine. (%)
W=1,300 J
Q2=6,100 J
Q1 =?
W=Q1-Q2
Q1=W+Q2
efficiency =(Q1-Q2)/Q1 =W/Q1

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