A bar magnet is held near a single closed loop of wire. The magnet is aligned with the loop axis, and the north pole is facing the loop. If the magnet is moved away, the current induced in the loop will be in a ________ direction as viewed from the side the magnet is on.
Fill in the blank(s) with the appropriate word(s).
clockwise
CW
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What are Sun grazers?
a. asteroids that impact the Sun b. meteors that impact the Sun c. any celestial body that orbits the Sun d. asteroids that come in close proximity to the Sun e. comets that come in close proximity to the Sun
Suppose I push a block along a tabletop at a constant velocity. If I exert a constant forward force of 
on the block and push it through a distance D, I do work on the block equal to ?F?D. Since the block’s kinetic energy does not change, friction must be exerting a backward force on the block of the same magnitude as 
(so that the net force on the block is zero, as required to maintain the block’s constant velocity). What work does the friction force do on the block?
A. No work
B. ? 
D
C. + D
D. Some negative work, but we need more information to determine exactly how much.
E. Some positive work, but we need more information to determine exactly how much.
Which statement about Population II is false?
A) The globular clusters are their most obvious groupings. B) Their orbits around the Galaxy resemble those of comets. C) They formed first as the Galaxy formed. D) At almost five billion years old, our Sun must belong to this older Population. E) They are made of almost nothing but hydrogen and helium.
An ideal gas is allowed to undergo a free expansion. If its initial volume is V1 and its final volume is V2, the change in entropy is
a. nR ln (V2/V1) b. nRT ln (V2/V1) c. nk ln (V2/V1) d. 0 e. nR V2/V1