The apparent brightness of stars is ranked according to magnitude. The brightest stars were originally ranked as what magnitude?
a. Zero
b. Sixth
c. First
d. None of the above
c
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The purpose of using epicycles and deferents to explain the motion of the planets in the night sky was to account for
a. prograde motion. b. Mercury and Venus' limited angular distance from the Sun. c. retrograde motion. d. non-uniform speed of the planets in their orbits. e. precession of the equinoxes.
How many times does the Moon cross the ecliptic each month?
a. none b. once c. twice d. three times e. four times
You slam on the brakes of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under identical conditions?
A) It would have skidded 4 times farther. B) It would have skidded 2 times farther. C) It would have skidded times farther. D) It would have skidded 1/ times farther. E) It would have skidded 1/2 as far.
Which of the following rocks would be expected to have the coarsest-grained texture?
a) granite b) obsidian c) basalt d) pumice