A fishing-boat captain returns to port saying, "It's rough out there with waves that are 4 meters high." He is probably talking of waves of amplitude
A) 1 m.
B) 2 m.
C) 3 m.
D) 4 m.
Answer: B
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Gaps in the asteroid belt (often called Kirkwood gaps) are caused by ________
A) tidal forces from Jupiter B) tidal forces from the Sun C) the competing gravitational tugs of Mars and Jupiter D) orbital resonances with Jupiter
When an ice skater twirling on the point of a skate draws her arms in she ends up whirling faster. This is because
A. linear momentum is conserved. B. angular momentum is conserved. C. rotational energy is conserved. D. a net external torque acts on the skater.
The separations of objects on the celestial sphere can be measured in units of
a. miles. b. kilometers. c. light years. d. parsecs. e. angle (such as degrees).
Which of the following sequences correctly describes the stages of life for a low-mass star?
A) protostar, red giant, main-sequence, white dwarf B) protostar, main-sequence, white dwarf, red giant C) white dwarf, main-sequence, red giant, protostar D) protostar, main-sequence, red giant, white dwarf E) red giant, protostar, main-sequence, white dwarf