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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