Supermassive black holes erupt in ____
a. any type of galaxy, and at random times
b. elliptical galaxies only, when the last of their gas and dust is consumed
c. galaxies that have been part of a collision or merger
d. spiral galaxies only, during a burst of star formation
e. irregular galaxies
c
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An ion is released from rest and moves due to the force from an electric field from a position in the field having a potential of 14 V to a position having a potential of 8 V. The ion:
a. must have a positive charge. b. must have a negative charge. c. can have either a positive or a negative charge. d. must be neutral.
The bigger diameter gears on the rear wheel of a multi-speed bike allow the rider to
A. decrease the moment of inertia of the wheel. B. increase the moment of inertia of the wheel. C. exert more force on the wheel. D. exert more torque on the wheel.
Which one of the following is an accurate statement about light?
A) When light strikes a surface at the critical angle, all the light passes through the surface. B) When light strikes a surface at the critical angle, only the reflected light is 100% polarized. C) When light strikes a surface at Brewster's angle, it is completely reflected at the surface. D) When light strikes a surface at Brewster's angle, only the reflected light is 100% polarized. E) When light strikes a surface at Brewster's angle, the reflected and transmitted light are both 100% polarized.
Two billiard balls have velocities of 2.0 m/s and -1.0 m/s when they meet in an elastic head-on collision. What is the final velocity of the second ball after collision?
a. +2.0 m/s c. -0.5 m/s b. -1.0 m/s d. +1.0 m/s