Which of the following best describes the primary difference between asteroids and comets?
A) Asteroids are rocky and comets are ice-rich.
B) Comets are much larger than asteroids.
C) Comets always have tails and asteroids never have them.
D) Comets tend to orbit the Sun in the inner solar system, while asteroids tend to orbit much farther away.
A) Asteroids are rocky and comets are ice-rich.
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How could you test the hypothesis that the acceleration of gravity does not depend on mass? (Ignore effects of air resistance.)
A) Drop two objects with the same mass from the same height. B) Drop two objects with the same mass from different heights. C) Drop two objects with different masses from the same height. D) Drop two objects with different masses from different heights.
When a fixed amount of ideal gas goes through an isobaric expansion
A) its internal (thermal) energy does not change. B) the gas does no work. C) no heat enters or leaves the gas. D) its temperature must increase. E) its pressure must increase.
Two motors in a factory are running at slightly different rates. One runs at 825 rpm and the other at 786 rpm. You hear the sound intensity increase and then decrease periodically due to wave interference
How much time elapses between successive maxima of the sound intensity? A) 1.5 s B) 1.4 s C) 1.7 s D) 1.8 s
As the frequency of the ac voltage across an inductor approaches zero, the inductive reactance of that coil
A) approaches zero. B) approaches one. C) approaches infinity. D) becomes negative.