During a complete cycle of an engine, the net internal energy change is 0. Durin

Question

During a complete cycle of an engine, the net
internal energy change is 0. During that cycle,
an amount of heat Qin enters the engine, an
amount Qout leaves the engine, and an amount
of work W is done. The following table lists
these quantities for a variety of engines.
Engine Qin Qout W
A 100 J 100 J 0 J
B 100 J 50 J 50 J
C 100 J 0 J 100 J
D 100 J 20 J 60 J
E 100 J 100 J 50 J

Which of these engines violates the second
law of thermodynamics?
1. D and E
2. only D
3. A, B and C
4. C and E
5. only C

(Please explain your answer!)

Explanation / Answer

D violates first law. Not enough work done.
E violates second law. Too much work done to be possible.

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