A real (non-Carnot) heat engine, operating between heat reservoirs at temperatures of and performs 4.3 kJ of net work and rejects of heat in a single cycle. The thermal efficiency of this heat engine is closest to
A) 0.35.
B) 0.31.
C) 0.28.
D) 0.38.
E) 0.42.
Answer: A
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Air at a temperature of 32° F has a relative humidity of 60%. If the temperature of the same air rises to 40° F, the relative humidity
a. stays the same. b. increases. c. decreases. d. cannot be determined.
Which of the following situations would lead to advection fog?
A) At night the temperature of the air layer at the ground falls below the temperature at which condensation begins B) During the day,the temperature of the air layer at the ground increases as a nearby air mass moves in C) Radiation fog commonly develops at the coast and is the result of warm marine air moving into coastal regions D) Radiation fog commonly develops at the coast and is the result of cold marine air moving into coastal regions E) Radiation fog commonly develops when warm moist air moves over a cold surface
The type of plate boundary at which one plate collides with another and subduction occurs is called ______________
a. transform b. divergent c. convergent d. none of these
The helium fusion process results in the production of
A) hydrogen. B) oxygen. C) carbon. D) nitrogen. E) iron.