An asteroid, of radius 2.1 km, is observed to have an escape speed equal to a typical person’s speed attained by jumping off, 3.0 m/s. What is its mass?
a. 
b. 
c. 
d. 
e. 
e.
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The tail of a comet is longest when the comet is
a. closest to the Sun. b. farthest from the Sun. c. closest to Earth. d. farthest from Earth.
In pre-Copernican astronomy, it was almost universally believed that
a. the planets traveled in elliptical orbits about Earth. b. the center of the universe was the Sun with the Milky Way representing other distant planets. c. the Sun was at the center of the universe. d. Earth was at the center of the universe. e. None of the above was believed.
A bubble-producing soda is an example of
a. an unsaturated solution. b. a saturated solution. c. a supersaturated solution. d. a completely unsaturated solution.
Europa has few craters because
a. it is protected from impacts by Jupiter's gravity. b. it does not have a solid surface. c. it has erased craters nearly as fast as they have formed. d. its surface is not strong enough to support craters. e. it keeps one face always pointed toward Jupiter which screens it from incoming meteorites.