A rock falls from a vertical cliff that is 4.0 m tall and experiences no significant air resistance as it falls. At what speed will its gravitational potential energy (relative to the base of the cliff) be equal to its kinetic energy?
A) 3.1 m/s
B) 4.4 m/s
C) 6.3 m/s
D) 8.9 m/s
E) 13 m/s
C
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What is your latitude if the north celestial pole appears on your horizon?
A) 90° N B) 90° S C) 0° D) 45° N
Which of the following cannot induce a voltage in a loop of wire?
A. Changing the current in a nearby loop B. Moving the loop near a magnet C. Moving a magnet near the loop D. Expanding or contracting the loop in a region where there is no magnetic field
Imagine that this classroom contains a constant magnetic field that points from the front to the back. In front of you a negative charge is slowly moving horizontally to your left. As you watch, the magnetic force on the charge
A. deflects the charge away from you. B. deflects the charge into a clockwise directed vertical circle. C. has no effect on the charge. D. deflects the charge into a counterclockwise vertical circle. E. deflects the charge toward you.
"Catastrophes" are NOT needed to explain:
A) the exceptionally large nickel-iron core of Mercury. B) the asteroid belt. C) our Moon. D) the tilt of Uranus. E) the appearance of Miranda's surface.