After a stone that is thrown straight up reaches the top of its path and then falls downward, its acceleration is
A) greater than at the top of its path.
B) less than at the top of its path.
C) the same as at the top of its path.
Answer: C
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What is the characteristic color of a reflection nebula?
A. yellow B. green C. black D. red E. blue
The half-life of a muon is 2.20 ?s as measured in a stationary reference frame. What is the half life of the muon (in ?s) when it is moving with a speed of v = 0.800c?
A. 8.13 B. 2.75 C. 3.67 D. 15.8 E. 1.32
The index of refraction of a type of glass is 1.50, and the index of refraction of water is 1.33. If light enters water from this glass, the angle of refraction will be
A) greater than the angle of incidence. B) equal to the angle of incidence. C) less than the angle of incidence.
Fallout from nuclear weapons or from a nuclear reactor accident is due to
A) the uranium nuclei used in the fission reaction. B) the radioactive "fission products" produced during the fission reaction. C) the neutrons produced during the fission reaction. D) chickens flying overhead. E) the radioactive "fusion products" produced during the fusion reaction.