An air conditioner with a coefficient of performance of 3.50 uses 30.0 kW of power to operate. What power is it discharging to the outdoors?
A) 30.0 kW
B) 75.0 kW
C) 105 kW
D) 135 kW
E) 210 kW
D
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As the number of loops in a current-carrying wire is increased, the
A) more spread out is the magnetic field. B) stronger the enclosed magnetic field. C) weaker the current. D) greater the back emf.
Fissioning an iron nucleus would occur with
A) absorption of energy. B) release of energy. C) neither absorption nor release of energy
If a person in Alaska were locked out of his house on a day when the temperature outside was ?40°C, his thick clothing would mostly reduce the loss of thermal energy by
A. conduction. B. convection. C. radiation. D. all of the above. E. convection and radiation.
Masses of the planets are easiest to determine if:
A) they are terrestrial and the extra size of the planet's disk can be measured. B) they are jovian and their oblateness can be found. C) they have natural satellites whose motions can be precisely measured. D) they are dense and easily deflect the path of passing spacecraft. E) they move rapidly and their periods are easily measured.