The Milky Way Galaxy is
a. a spiral galaxy.
b. part of a cluster of galaxies that contains a few dozen galaxies.
c. about 80,000 light years in diameter.
d. All of the other choices are correct.
d
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Light is emitted when an electron
A) is boosted to a higher energy level. B) makes a transition to a lower energy level. C) accelerates to a medium energy level. D) none of the above
A difference between linear momentum and angular momentum involves
A) a radial distance. B) two types of speed. C) both of these D) neither of these
The cosmic microwave background is:
A) redshifted in the direction of Earth's motion. B) redshifted in the direction of the Sun's motion. C) redshifted in the direction of the center of the Milky Way. D) blueshifted in the direction of Earth's motion. E) blueshifted in the direction of the Virgo Cluster.
A popular demonstration involves a professor, initially motionless, standing on a low-friction turntable and holding a bicycle wheel that is spinning horizontally. What happens when the professor flips the bicycle wheel so that it is spinning in the other direction?
1.She starts to spin in the same direction as the initial direction of the bicycle wheel. 2.She starts to spin in the bicycle wheel's new spin direction. 3.She remains stationary. 4.It is impossible to tell because it depends on how fast the bicycle wheel initially spins.