In 1974, a radio message was sent out from the Arecibo observatory in Puerto Rico. How far has it gotten, approximately?
A) just beyond our Solar System
B) not even to the nearest stars
C) just a miniscule fraction of the distance across the Milky Way
D) almost to the center of the Milky Way
E) beyond the Milky Way, to the Andromeda galaxy
C
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A rigid cylinder (15 cm radius, 15 cm height) contains nitrogen gas 
at standard temperature and pressure. What is the total translational kinetic energy of the gas molecules in the cylinder?
A. 1.6 kJ B. 0.51 kJ C. 0.86 kJ D. 2.7 kJ
The variables length l, gravity g, velocity V, and density ? can be combined into the dimensionless term:
Why is the air over an open flame always moist?
A) The hot flame vaporizes the water in the air above the flame. B) One of the products of combustion is water vapor. C) Warm air contains more humidity than cold air. D) None of the above is true.
One phenomenon or experiment that supports the wave theory of matter is
A) the Michelson-Morley experiment. B) the tiny flashes that are observed when a light beam strikes a screen. C) interference effects with light. D) the tiny flashes that are observed when an electron beam strikes a screen. E) the double-slit experiment with electrons.