Question 1
When water of mass m and specific heat c is heated from absolute temperature T1 to absolute temperature T2, its change in entropy is
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cm ln(T2/T1)
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cm (T2/T1)
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cm (T2−T1)/T1
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cm (T2−T1)/T2
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cm (T2−T1)/(T2 + T1)
Question 2
Which answer below is not a statement of the second law of thermodynamics?
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Real processes proceed in a preferred direction.
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Energy does not flow spontaneously by heat from a cold to a hot reservoir.
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The entropy of the universe increases in all natural processes.
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In theory, heat engines working in a cycle employ reversible processes.
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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.
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