When did the objects that we now see as asteroids and comets form in the solar system?
a. Before the cloud flattened into a disk.
b. After the cloud flattened into a disk but before solid particles condensed from the gas.
c. After solid particles condensed from the gas but before the planets finished forming.
d. After the planets finished forming.
Answer: c. After solid particles condensed from the gas but before the planets finished forming.
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Which of the following planets has the highest uncompressed density?
A) Mars B) Venus C) Mercury D) Earth
Of the Galilean moons, the one with striking grooved terrain and icy tectonic features as well as older craters is:
A) Amalthea. B) Io. C) Europa. D) Ganymede. E) Callisto.
A ball falls from the top of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?
A) K is equal to U. B) K is greater than U. C) K is less than U. D) It is impossible to tell.
Which of the following is true? The number of daylight hours depends on
a. the International Date Line. b. the longitude. c. the latitude. d. all of these.