In each cycle of its operation, a heat engine expels 4,000 J of energy and performs 2,000 J of mechanical work?

Question

In each cycle of its operation, a heat engine expels 4,000 J of energy and performs 2,000 J of mechanical work.

(a) How much thermal energy must be added to the engine in each cycle?
(b) Find the thermal efficiency of the engine.

Anonymous · Accepted Answer

(a) 2000J + 4000J = 6000J must be input to the engine each cycle.

(b) η (efficiency) = (energy in – energy out)/(energy in) x 100% = (6000 – 4000)/6000 x 100 % = 331/3%.

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