Afirebox is at 650 k, and the ambient temperature is 250 k. the efficiency of a carnot engine doing 146 j of work as it transports energy between these constant-temperature baths is 61.5%. the carnot engine must take in energy 146 j/0.62 = 237.3 j from the hot reservoir and must put out 91.3 j of energy by heat into the environment. to follow carnot's reasoning, suppose some other heat engine s could have efficiency 70.0%.(a) find the energy input and exhaust energy output of engine s as it does 146 j of work

Qce = 91.25 J

Explanation:

Given

W = 146 J , Tc = 250 k ,  Th = 650 K

Qhe = W / [ 1 -  ( Tc / Th ) ]

Tc / Th = 250 / 650 = 0.384615384

Qhe = 146 J / 0.615384615

Qhe = 237.25 J

So replacing to find the energy exhaust energy

Qce = Qhe - W

Qce = 237.25 J - 146 J

Qce = 91.25 J

photocells convert light energy to electricity

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