# PHYSICS DUE SOON

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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.____%

• PHYSICS DUE SOON -

a
6100 + 1300 = 7,400 J

b
work out/heat in = 13/74 = .176 = 17.6 %

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