The energy from an AGN is produced by
a. the collision of two spiral galaxies.
b. the collision of two elliptical galaxies.
c. the collision of two radio jets.
d. matter flowing into a supermassive black hole.
e. supernovae.
D
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On a cold winter day, you turn up the thermostat in your house. Assume that your house is well sealed and that no air enters or leaves the house
When the air temperature in your house rises a short while later, what statement is correct regarding the air pressure? A) The air pressure is higher at the higher temperature. B) The air pressure is lower at the higher temperature. C) The air pressure does not change at the higher temperature. D) The air pressure increases at first but then decreases again as the temperature approaches its higher value. E) The air pressure decreases at first but then increases again as the temperature approaches its lower value.
At most, how many bright fringes can be formed on each side of the central bright fringe (not counting the central bright fringe) when light of 625 nm falls on a double slit whose spacing is 1.97 × 10-6 m?
A) 1 B) 2 C) 3 D) 4 E) 5
It is believed that ring galaxies form
a. when two galaxies collide at high speeds. b. when two spiral galaxies collide, but not directly head on. c. from a large cloud of gas and dust with very little angular momentum. d. from a large cloud of gas and dust with a very high angular momentum. e. when more than two galaxies collide at the same time.
A transformer is to be designed to increase the 30 kV rms output of a generator to the transmission-line voltage of 345 kV rms. If the primary winding has 80 turns, how many turns must the secondary have?
a. 6 b. 70 c. 920 d. 9200 e. 12