Consider the glider described in problem N10T.4. Its phase rate is
A. 0.30 s-1
B. 0.15 s-1
C. 0.60 s-1
D. 3.77 s-1
E. 0.096 s-1
F. Some other result (specify)
F. Some other result (specify)
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Compared with stars in the disk, orbits of stars in the halo
A) are relatively uniform to each other. B) are elliptical, with random orientation. C) are elliptical but orbiting in the same direction. D) do not have to be around the galactic center. E) do not have to pass through the plane of the galaxy.
A gravitational lens occurs when
A) a massive object causes more distant objects to appear much larger than they should, and we can observe the distant objects with better resolution. B) a telescope lens is distorted by gravity. C) a massive object bends light beams that are passing nearby. D) dark matter builds up in a particular region of space, leading to a very dense region and an extremely high mass-to-light ratio.
Inductive reactance XL is given by
a. L? b. L/? c. 1/L? d. ?/L e. ?2L
We should expect galaxies to collide fairly often because
a. they are large with respect to their separation distances. b. galaxies contain large amounts of neutral hydrogen. c. galaxies occur in clusters. d. they are large with respect to their separation distances and galaxies occur in clusters. e. None of the other choices are correct.