According to the theory that active galactic nuclei are powered by supermassive black holes, the energy released as light comes from
A) nuclear fusion in the accretion disk surrounding the black hole.
B) gravitational potential energy released by matter that is falling toward the black hole.
C) matter-antimatter annihilation occurring just outside the event horizon of the black hole.
D) jets emerging from the accretion disk.
B
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A 5.00 kg mass is located at (2.00 m, 0.00 m, 3.00 m) and a 2.00 kg mass is located at (0.00 m, 4.00 m, –2.00 m). The center of gravity of the system of masses is
A. (10/7m, 8/7m, 11/7m). B. (11/7m, 7/7m, 8/7m). C. (7/7m, 10/7m, 11/7m). D. (10/7m, 7/7m, 8/7m). E. (8/7m, 7/7m, 10/7m).
AC voltage may be stepped up or stepped down using a(n) ______________
Fill in the blank(s) with correct word
The composition of the protoplanetary disk varies with distance from the protostar due to temperature. Starting with those closest to the protostar, place these materials in order based on where they can be found predominantly in their solid states.
What will be an ideal response?
A 10-kilogram block with an initial velocity of 10 m/s slides 10 meters across a horizontal surface and comes to rest. It takes the block 2 seconds to stop. The stopping force acting on the block is about
A) 5 N. B) 10 N. C) 25 N. D) 50 N. E) none of the above