A heat engine absorbs 2500 J of heat from a hot reservoir and expels 1000 J to a cold reservoir. When it is run in reverse, with the same reservoirs, the engine pumps 2500 J of heat to the hot reservoir, requiring 1500 J of work to do so. Find the ratio of the work done by the heat engine to the work done by the pump. Is the heat engine reversible?
a. 1.0 (no)
b. 1.0 (yes)
c. 1.5 (yes)
d. 1.5 (no)
e. 2.5 (no)
b
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The natural circulation of water—from ocean to air to ground to ocean and then back to the atmosphere—is called the
A) circle of life. B) hydrologic cycle. C) carbon cycle. D) rock cycle.
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When a fixed amount of ideal gas goes through an isochoric process,
A) its internal (thermal) energy does not change. B) the gas does no work. C) no heat enters or leaves the gas. D) its temperature must increase. E) its pressure must increase.