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Carnot Cycle

A heat engine...

Question

A heat engine with an efficiency of $25$ % takes in $800 J$ of energy in each cycle. How much waste heat is extracted during each cycle?

A

100 J

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B

200 J

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C

300 J

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D

400 J

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E

600 J

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Solution

The correct option is E $600 J$
Efficiency , $η = \frac{W}{Q_{a}} = \frac{Q_{a} - Q_{e}}{Q_{a}}$
or $25 / 100 = \frac{800 - Q_{e}}{800}$
or $3200 - 4 Q_{e} = 800$ or $Q_{e} = 600 J$

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