________ galaxies seem to represent a transition between quasars and similar active nuclei compared to more normal spirals
Fill in the blank(s) with correct word
Seyfert
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At what orientation angle relative to the magnetic field direction does the magnetic potential energy of a magnetic dipole have its largest value?
a) 0° b) 45° c) 90° d) 135° e) 180°
Suppose you read somewhere that 10 percent of the matter in the Milky Way is in the form of dust grains. Should you be surprised? If so, why?
A) Given how easily dust grains can form, 10 percent is a surprisingly low fraction. B) The fraction of 10 percent is surprisingly high because dust grains can form only at low temperatures. C) There is nothing surprising about the 10 percent figure because dust grains are the material from which stars are born. D) The fraction of 10 percent cannot be correct. Dust grains are solid and only 2 percent of the matter in the galaxy is made of anything besides hydrogen and helium.
A(n) ____________________ is the expulsion of the outer layers of a moderate mass star that has a degenerate carbon and oxygen core
Fill in the blank(s) with correct word
Proportional Reasoning: Assuming equal rates of acceleration in both cases, how much longer would it take a car to stop if braking from 56 mi/h than from 28 mi/h?
A. 8 times as long B. 4 times as long C. 2 times as long D. 1.4 times as long E. the same in both cases