What is the size of an object located at a distance of 1,000 meters and that has angular size A = 4 degrees?
A. about 4,000 meters
B. about 11 meters
C. about 35 meters
D. about 70 meters
Answer: D
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Some gamma-ray bursts last only a few seconds and do not appear to come from supernovae. What is the leading hypothesis for the origin of short these gamma-ray bursts?
A) new stars forming in the Milky Way B) bursts of fusion occurring on the surfaces of white dwarfs in binary systems C) bursts of fusion occurring on the surfaces of neutron stars in binary systems D) The explosion of a white dwarf E) The mergers of two neutron stars
The element gold contains
A) gold atoms. B) atoms that combine to produce gold. C) gold atoms plus various slightly lighter and heavier atoms. D) none of the above
An Olympic skier moving at 22.0 m/s down a 30.0° slope encounters a region of wet snow, of coefficient of friction µk = 0.740 . How far down the slope does she go before stopping?
a. 119 m c. 175 m b. 145 m d. 199 m
The purpose of prescription glasses for a near-sighted person is to bring the apparent positions of distant objects
a. to the far point of the eye b. to the near point of the eye c. to the retina of the eye d. none of the above