According to the theory that active galactic nuclei are powered by supermassive black holes, the energy released as light comes from ________
A) matter-antimatter annihilation occurring just outside the event horizon of the black hole
B) gravitational potential energy released by matter that is falling toward the black hole
C) jets emerging from the accretion disk
D) nuclear fusion in the accretion disk surrounding the black hole
B
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Imagine placing two long wires parallel to each other. If conventional currents flow through them in the directions shown, will the wires attract, repel, or exert no net force on each other?
A. Attract each other
B. Repel each other
C. Exert no net force on each other
To catch a fast-moving ball, you extend your hand forward before contact with the ball and let it ride backward in the direction of the ball's motion. Doing this reduces the force of contact on your hand principally because the
A) force of contact is reduced. B) relative velocity is less. C) time of contact is increased. D) time of contact is decreased. E) none of the above
Fission is used in
a. atomic bombs b. power plants c. energy for stars d. hydrogen bombs e. a tokamak reactor
Inductive Reactance is actually a consequence of
A) Gauss's Law. B) Coulomb's Law. C) Faraday's Law. D) Newton's Law.