How much better resolution would a 60 mm objective lens have than your eye's 6 mm exit pupil?
A) 6 times
B) 10 times
C) 16 times
D) 60 times
E) 100 times
B
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Evidence indicates that many gamma-ray bursts are produced by
A) supernovae of very high-mass stars. B) the explosion of a white dwarf. C) bursts of fusion occurring on the surfaces of white dwarfs in binary systems. D) bursts of fusion occurring on the surfaces of neutron stars in binary systems.
Based on current evidence, how does the actual average density of matter in the universe compare to the critical density?
A) The actual average density of matter, even with dark matter included, is only about a quarter of the critical density. B) If we include dark matter, the actual average density of matter equals the critical density. C) The actual average density of matter less than 1% of the critical density. D) The actual density of average matter is about twice the critical density.
The position of an object is given by x = at3 – bt2 + ct, where a = 4.1 m/s3, b = 2.2 m/s2, c = 1.7 m/s, and x and t are in SI units. What is the instantaneous acceleration of the object when t = 0.7 s?
A) -13 m/s2 B) 2.9 m/s2 C) 4.6 m/s2 D) 13 m/s2
When rock is broken down into smaller and smaller pieces, we say the rock has undergone
A) chemical weathering. B) mechanical weathering. C) erosion. D) lithification.