A bar magnet is dropped, N pole down, so it falls through a horizontal loop of wire. As it leaves the loop, the induced current (viewed from above) is:
A) clockwise
B) counterclockwise
C) zero
A
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Among the modes of energy transfer in stars, _____ is the least efficient of all
A) conduction B) convection C) radiation D) evaporation
A sample of a diatomic ideal gas occupies 33.6 L under standard conditions. How many moles of gas are in the sample?
A) 3.0 B) 4.5 C) 1.5 D) 2.0 E) 0.75
Which of the following is true of the signs of the zodiac?
A) They have a huge impact on the seasons. B) They are no longer important in astronomy. C) They determine the course of Earth's orbit. D) They are no longer important in astrology.
Car A rear ends Car B, which has twice the mass of A, on an icy road at a speed low enough so that the collision is essentially elastic. Car B is stopped at a light when it is struck. Car A has mass m and speed v before the collision. After the collision
A. each car has half the momentum. B. car A stops and car B has momentum mv. C. car A stops and car B has momentum 2mv. D. the momentum of car B is four times as great in magnitude as that of car A. E. each car has half of the kinetic energy.