What is the change in entropy when 1 kg of ice melts at 0°C is (in J/K)? (LF,ice = 333 J/g.)
A. 335.
B. 603.
C. 1220.
D. 1310.
E. 2160.
Answer: C
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Doubling both charges changes the potential energy for a pair of point charges by a factor of
A. 2. B. 4. C. 1?2. D. 1?4. E. 1 (no change).
Work is done when
a. the displacement is not zero. b. the displacement is zero. c. the force is zero. d. the force and displacement are perpendicular.
Suppose the Hubble constant turned out to be 130 km/sec/Mpc and not 65 km/sec/Mpc. How would that affect our estimate of the age of the Universe?
A. The Universe would be about 7 billion yrs old. B. The Universe would be about 30 billion yrs old. C. It would have no effect on our estimates of the Universe's age. D. The Universe would be about 130 billion yrs old. E. None of these choices is correct.
Light behaves like
a. a wave at times, and a particle at other times. b. a wave. c. a particle. d. both a wave and a particle, because of its dual nature.