Problem: An engineer claims to have built four engines. When operating between two reservoirs at 400 K and 300 K, the engines have the following characteristics:1) QH = 200 J, QC = -175 J, and W = 40 J2) QH = 500 J, QC = -200 J, and W = 400 J3) QH = 600 J, QC = -200 J, and W = 400 J4) QH = 100 J, QC = -90 J, and W = 10 JDo any of these engines violate either the first or the second law of thermodynamics?

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Problem Details

An engineer claims to have built four engines. When operating between two reservoirs at 400 K and 300 K, the engines have the following characteristics:

1) QH = 200 J, QC = -175 J, and W = 40 J

2) QH = 500 J, QC = -200 J, and W = 400 J

3) QH = 600 J, QC = -200 J, and W = 400 J

4) QH = 100 J, QC = -90 J, and W = 10 J

Do any of these engines violate either the first or the second law of thermodynamics?

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Based on our data, we think this problem is relevant for Professor Zhang's class at MIZZOU.