In a heat pump, cooling is accomplished when
A) condensation occurs in its coils.
B) vaporization occurs in its coils.
C) both of these
D) neither of these
Answer: B
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In which of the following cases would inhabitants of Uranus never see the Sun rise or set?
A) If it grows massive enough to capture large amounts of gas from the solar nebula B) During a season when one of its poles is pointed nearly at the Sun C) When sunlight-darkened deposits of methane erupt out of liquid nitrogen geysers D) When spring comes to the southern hemisphere and autumn to the northern hemisphere
If two objects of different masses are dropped
near the Earth’s surface from the same height at the same instant and air resistance is neglected, we will find that a)the downward acceleration of the two objects must be quite different. b) both objects will experience the same gravitational force. c) both objects will strike the ground at the same time. d) the weight of both objects will be the same.
Constructive interference is a result of two waves arriving at a point ________.
Fill in the blank(s) with the appropriate word(s).
Power: A 100-W light bulb is operated by a 110-V dc source. What is the resistance of this bulb?
A. 100 ? B. 8.0 × 10-3 ? C. 6.0 × 10-3 ? D. 120 ? E. 240 ?