The observed relationship between the masses of central black holes and the bulge masses of galaxies implies that
A) galaxy formation and supermassive black hole formation must be related.
B) the black hole will eventually suck in the rest of the galaxy.
C) the biggest galaxies have the most luminous quasars.
D) quasars were more common 10 billion years ago than they are today.
A) galaxy formation and supermassive black hole formation must be related.
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What is a shock wave?
a. A wave caused by an earthquake. b. Any loud sound moving through the air. c. The edge of the pressure cone caused by superimposed waves from an object moving faster than sound. d. The point of the pressure cone caused by superimposed waves. e. The distance from the crest to the trough of a set of waves.
A -7.0-?C point charge has a positively charged object in an elliptical orbit around it. If the mass of the positively charged object is 1.0 kg and the distance varies from 5.0 mm to 20.0 mm between the charges,
what is the maximum electric potential difference through which the positive object moves? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) A) 9.4 MV B) 3.2 MV C) 4.2 MV D) 16 MV
A horizontally-projected beam of electrons travelling at 55 km/s travels between two parallel plates between which there is an electric field. The beam travels exactly horizontally the whole time it is between the plates. What does this imply about the electric field between the plates?
A. It is 0. B. It is 56 pV/m upward. C. It is 56 pV/m downward. D. It doesn’t imply anything in particular.
At a certain instant the current flowing through a 5.0-H inductor is 3.0 A. If the energy in the inductor at this instant is increasing at a rate of 3.0 J/s, how fast is the current changing?
A) 0.20 A/s B) 0.10 A/s C) 0.80 A/s D) 0.40 A/s