Author Question: Which answer below is not a statement of the second law of thermodynamics? a. Real processes ... (Read 54 times)

rl · **on:** Jul 28, 2018

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.

Question 2

An engine is designed to obtain energy from the temperature gradient of the ocean. What is the thermodynamic efficiency of such an engine if the temperature of the surface of the water is 59F (15C) and the temperature well below the surface is 41F (5C)?
a. 3.5
b. 67
c. 31
d. 17
e. 96