Mercury's average density is about as high as Earth's. This is most likely because
A. it is composed of material blasted off Earth in a collision.
B. it is highly compressed by its own gravity.
C. unlike Earth, it does not have a (light) atmosphere that lowers its average density.
D. it contains a significantly higher fraction of iron than Earth.
Answer: D
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To double the period of a pendulum, you need to multiply its length by a factor of:
A. 
B. 2
C. 
D. 
E. 4
F. Some other result (specify)
One phenomenon that demonstrates the particle nature of light is:
a. the photoelectric effect. b. diffraction effects. c. interference effects. d. the prediction by Maxwell's electromagnetic theory.
The focal length of a convex mirror is has a magnitude of 20 cm. What is its radius of curvature?
A) 40 cm B) -10 cm C) 20 cm D) -40 cm E) -20 cm
When the equilibrium concentration of vacancies is present in a crystal at constant temperature and pressure, the Gibbs free energy is at a(n) _____________.
Fill in the blank(s) with the appropriate word(s).