The terrestrial planets and the giant planets have different compositions because
Choose one:
A. the terrestrial planets have few moons.
B. the giant planets are much larger.
C. the terrestrial planets are closer to the Sun.
D. the giant planets are mostly made of solids.
C. the terrestrial planets are closer to the Sun.
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Suppose you are playing hockey on a new-age ice surface for which there is no friction between the ice and the hockey puck. You wind up and hit the puck as hard as you can. After the puck loses contact with your stick, the puck will
A) start to slow down. B) speed up a little, and then move at a constant speed. C) not slow down or speed up. D) speed up a little, and then slow down.
A source emits sound at a fixed constant frequency f.If the source moves away from you, and at the same time you run away from the source, the frequency you hear is
a. the same as f. b. higher than f. c. lower than f. d. unrelated to f.
A light-year (ly) is the distance that light travels in one year. The speed of light is 3.00 × 108 m/s. How many miles are there in 1.00 ly? (1.00 mi = 1.609 km and one year is 365.25 days.)
A) 2.87 × 1013 mi B) 9.46 × 1015 mi C) 5.88 × 1015 mi D) 9.46 × 1012 mi E) 5.88 × 1012 mi
The ozone layer is
a. transparent to ultraviolet radiation. b. opaque to ultraviolet radiation. c. opaque to visible light. d. opaque to infrared radiation. e. responsible for producing most of the oxygen that animal life needs.