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?

18%

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64%

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82%

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40%

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Solution

The correct option is C
82%

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

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

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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?

The correct option is C 82% QH=W+QL=50000 J e=Energy outputEnergy input=WQH=41000 J50000 J=82 or 82%

The correct option is C
82%

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

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