Which answer below is not a statement of the second law of thermodynamics?
A. Real processes proceed in a preferred direction.
B. Energy does not flow spontaneously by heat from a cold to a hot reservoir.
C. The entropy of the universe increases in all natural processes.
D. In theory, heat engines working in a cycle employ reversible processes.
E. You cannot construct a heat engine, operating in a cycle that does nothing but take heat from a reservoir and perform an equal amount of work.
Answer: D
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