If a bar magnet is falling through a loop of wire, the induced current in the loop of wire sets up a field which exerts a force on the magnet. This force between the magnet and the loop will be attractive when
a. the magnet enters the loop.
b. the magnet is halfway through.
c. the magnet is leaving the loop.
d. never.
c
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The first stage of Earth's evolution is _____
A) cratering B) basin formation C) differentiation D) slow surface evolution
Which planet's existence was correctly predicted based on mathematical calculations of the orbital motions of other planets before it was seen by a telescope?
A) Mercury B) Uranus C) Neptune D) Pluto
A bicycle is traveling north at 5.0 m/s. The mass of the wheel, 2.0 kg, is uniformly distributed along the rim, which has a radius of 20 cm. What are the magnitude and direction of the angular momentum of the wheel about its axle?
A) 2.0 kg • m2/s towards the west B) 5.0 kg • m2/s vertically upwards C) 2.0 kg • m2/s towards the east D) 5.0 kg • m2/s towards the east E) 5.0 kg • m2/s towards the west
In an adiabatic free expansion
a. no heat is transferred between a system and its surroundings. b. the pressure remains constant. c. the temperature remains constant. d. the volume remains constant. e. the process is reversible.