Water can change phase to become ice by
A) extraction of energy.
B) lowering the surrounding air pressure.
C) both of these
D) neither of these
Answer: C
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Which graph best describes the x-acceleration of the object described in problem N2T.13?
A. A
B. B
C. C
D. D
E. E
The circuit power factor of an RL circuit connected across an ac source is one. What would be a good description of the frequency of this source?
A) Low B) Very low C) High D) Very high
Suppose you charge two transparencies by rubbing and then hold them near each other but not touching. Regarding the electric and magnetic forces they exert on each other,
A) they will exert neither electric nor magnetic forces because they are not in contact with each other. B) they will exert electric forces but not magnetic forces. C) they will exert neither electric nor magnetic forces because neither object is moving. D) they will exert both electric and magnetic forces. E) they will exert magnetic forces but not electric forces.
A simple pendulum and an object oscillating on an ideal spring both have period T in an elevator at rest. If the elevator now moves downward at a uniform 2 m/s, what is true about the periods of these two systems?
A) Both periods would remain the same. B) Both periods would increase. C) Both periods would decrease. D) The period of the pendulum would increase but the period of the spring would stay the same. E) The period of the pendulum would decrease but the period of the spring would stay the same.