Kepler's Laws: Two moons orbit a planet in circular orbits. Moon A has orbital radius R, and moon B has orbital radius 4R. Moon A takes 20 days to complete one orbit. How long does it take moon B to complete an orbit?
A. 20 days
B. 80 days
C. 160 days
D. 320 days
E. 5 days
Answer: C
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Banked Curves: Two horizontal curves on a bobsled run are banked at the same angle, but one has twice the radius of the other. The safe speed (for which no friction is needed to stay on the run) for the smaller radius curve is v. What is the safe speed on the larger-radius curve?
A. v /
B. 2v
C. v
D. v/2
An asteroid is in orbit at 4 times the Earth's distance from the Sun. What is its period of revolution?
a. one fourth year b. 4 years c. 8 years d. 16 years
The alloy treatment that provides the lowest-strength and highest-ductility alloys is the _________condition.
Fill in the blank(s) with the appropriate word(s).
About how many times larger in diameter is a 
nucleus than an 
nucleus?
A. 2.37 B. 1.54 C. 1.33 D. They are about the same size. E. Some other factor (specify)