Again, the engine does 41,000 J of useful work. If it sinks 9,000 J of energy in

Question

Again, the engine does 41,000 J of useful work. If it sinks 9,000 J of energy in the form of heat to its cold reservoir, what is the efficiency of this engine?

Options:

A . 18%

B . 64%

C . 82%

D . 40%

Answer: Option C
:
C

Q_{H} = W + Q_{L} = 50000 J

e = \frac{E n e r g y o u t p u t}{E n e r g y i n p u t} = \frac{W}{Q_{H}} = \frac{41000 J}{50000 J} = 82 o r 82 %

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