A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is
A) equal to its weight.
B) equal to its weight divided by its mass.
C) equal to its mass times its weight.
D) none of the above
Answer: D
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Suppose we had a device that allowed us to see Earth's interior. If we looked at a typical region of the mantle, what would we see happening?
A) not much—on human time scales, the mantle looks like solid rock B) hot molten rock rising upward throughout the mantle and cool, solid rock falling downward C) a rapid, up-and-down churning of the material in the mantle D) dense metals falling downward while low-density rock rises upward
Identical point charges (+50 ?C) are placed at the corners of a square with sides of 2.0-m length. How much external energy is required to bring a fifth identical charge from infinity to the geometric center of the square?
A. 41 J B. 16 J C. 64 J D. 10 J E. 80 J
In which wavelength region(s) would we need to carry out observations in order to study the accretion disk around a white dwarf in a binary system?
A) visible light B) ultraviolet light C) X-ray light D) A and B E) B and C
Any indication of prehistoric life preserved in rock is called
a. a shale. b. a radionuclide. c. a fossil. d. none of these.