Which of the following is true of the star clusters in the Milky Way?
A) Open clusters are widely scattered in the Milky Way.
B) Globular clusters are concentrated along the disk of the Milky Way.
C) Open clusters are more common toward the constellation Sagittarius.
D) Globular clusters are much too far away to have measureable parallaxes.
D
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The Himalayas in Asia are examples of ______________ mountains
Fill in the blank(s) with correct word
When we see that a spectral line of a galaxy is broadened, that is, spanning a range of wavelengths, we conclude that
A) we do not have very good resolution of a star's orbital velocity. B) there are many stars traveling at extremely high orbital velocities. C) there are different Doppler shifts among the individual stars in the galaxy. D) we are actually measuring the orbital velocity of a cloud of atomic gas. E) we are actually measuring the orbital velocity of dark matter.
A factory siren indicating the end of a shift has a frequency of 80 Hz. What frequency is perceived by the occupant of a car traveling away from the factory at 30 m/s? The speed of sound in air is 343 m/s
A) 73 Hz B) 75 Hz C) 77 Hz D) 79 Hz E) 81 Hz
Free Fall: A rock is projected upward from the surface of the Moon, at time t = 0 s, with an upward velocity of 30.0 m/s. The acceleration due to gravity at the surface of the Moon is 1.62 m/s2, and the Moon has no atmosphere. The height of the rock when it is descending with a speed of 20.0 m/s is closest to
A. 115 m. B. 125 m. C. 135 m. D. 145 m. E. 154 m.