During which stage of planetary development did the lunar maria form?
a. cratering
b. differentiation
c. flooding
d. tectonic plate movement
e. slow surface evolution
c
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Refer to the diagram of Racetrack X. 
This special racetrack is all curve and no straightaway. If a driver takes her car around this track counterclockwise and at constant speed, then greater acceleration will occur at any place the turning radius is
A. larger. B. inward. C. outward. D. smaller.
The primary mirrors of most radio telescopes is similar to the primary mirror of a reflecting optical telescope in that
a. they are both concave in shape. b. they are both convex in shape. c. they are typically the same size. d. they are both made of metal. e. they have nothing in common.
A typical space telescope is operated by how many astronauts?
A) 7 B) 5 C) 3 D) 1 E) 0
A highway curve of radius 80 m is banked at 45°. Suppose that an ice storm hits, and the curve is effectively frictionless. What is the speed with which to take the curve without tending to slide either up or down the surface of the road?
A) 9.4 m/s B) 28 m/s C) 780 m/s D) The curve cannot be taken safely at any speed.