Thermodynamic Devices: A heat pump with a performance coefficient (COP) of 4.9 absorbs heat from the atmosphere at a rate of 29 kW. At what rate is work being done to run this heat pump?
A. 6 kW
B. 142 kW
C. 113 kW
D. 35 kW
Answer: A
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A 160 lb person has a mass of 160/32 = 5 slugs. A 160-lb person steps into an elevator and stands on a bathroom scale. Determine the scale reading for the given scenarios. After moving downwards at constant speed, the elevator is slowing down at 2 m/s2 as it is coming to rest
a. 150 lb b. 160 lb c. 170 lb d. none of the above
The observed relationship of 1/500 between the masses of central black holes and the bulge masses of galaxies implies that
A) the black hole will eventually suck in the rest of the galaxy. B) galaxy formation and supermassive black hole formation must be related somehow. C) the biggest galaxies have the most luminous quasars. D) quasars were more common 10 billion years ago than they are today.
Two thermometers are calibrated, one in degrees Celsius and the other in degrees Fahrenheit. At what temperature (in kelvins) do their readings measure the same temperature?
a. 218.15 b. 233.15 c. 273.15 d. 40.15 e. 0
Converging mirrors
A. Will reflect parallel light rays to the focal point of the mirror. B. Will cause parallel light rays to spread out. C. Will reflect parallel light rays back along their original path D. Will scatter parallel light rays in random directions.