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When a light ray in air enters water at 15o from the normal, it
A) always bends toward the normal.
B) always bends away from the normal.
C) sometimes bends towards or away from the normal.
D) does not bend.
If you float a piece of wood in a container half-full of water that rests on a weighing
scale, the weight reading on the scale will
A) decrease.
B) remain unchanged.
C) increase.
Compared to the energy put into a laser, the energy of the laser beam is
A) usually much more.
B) much less.
C) the same.
D) none of the above
Materials composed of molecules that absorb large amounts of energy in the form of
internal vibrations and rotations have
A) low specific heats.
B) high specific heats.
C) none of the above
An isotope is simply an atom that
A) is electrically charged.
B) has different numbers of neutrons for the same element.
C) both of these
D) neither of these
A satellite coasting at constant speed in a circular orbit
A) is beyond the pull of Earth's gravity
B) is nevertheless accelerating.
C) undergoes changes in its potential energy.
D) none of the above
Lillian safely touches a 100,000-volt Van de Graaff generator. Although the voltage is
high, the relatively small amount of charge means a relatively small amount of
A) energy transfer.
B) electric field.
C) polarization.
D) conduction.
Which of these animals has a quicker stride?
A) giraffe
B) horse
C) cat
D) mouse
The hottest star is the one that glows
A) red.
B) white.
C) blue.
D) need more information
A seagull flying at 10 km/h in a 10-km/h crosswind has a resultant speed of
A) 10 km/h.
B) about 14 km/h.
C) 20 km/h.
D) more than 20 km/h.
The wind instrument with no keys or valves is a
A) trumpet.
B) saxophone.
C) clarinet.
D) bugle.
The air in this room has
A) mass.
B) weight.
C) energy.
D) all of the above
E) none of the above
The air in your room is composed of molecules that have
A) nearly identical speeds.
B) a wide variety of speeds.
C) no speeds worth mentioning.
If you break a bar magnet in half you'll
A) destroy its magnetic properties.
B) have two magnets.
C) have two and a half magnets.
D) none of the above
To reduce the danger of self-induction
A) simply pull the circuit plug.
B) turn off the switch to the circuit.
C) either of these
D) neither of these
The chemical properties of matter are due mostly to their
A) protons.
B) electrons.
C) neutrons.
A 60-W light bulb connected to a 120-V source draws a current of
A) 0.25 A.
B) 0.5 A.
C) 2.0 A.
D) 4.0 A.
E) more than 4 A.
Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave
received at 100 megahertz is
A) 0.3 m.
B) 3.0 m.
C) 30 m.
D) 300 m.
E) none of the above
Angular momentum is conserved for a satellite in
A) circular orbit.
B) elliptical orbit.
C) both of these
D) neither of these
An object falls freely from rest on a planet where the acceleration due to gravity is
twice as much as on Earth. In the first 5 seconds it falls a distance of
A) 100 m.
B) 150 m.
C) 250 m.
D) 500 m.
E) none of the above
To save energy while you leave your cool house for a half hour on a hot day, turn the
temperature setting on the air conditioner
A) down.
B) up.
C) off altogether.
D) to room temperature.
A player hits a ball with a bat. If action is the force of the bat against the ball, reaction is
the
A) air resistance on the ball.
B) weight of the ball.
C) force that the ball exerts on the bat.
D) grip of the player's hand against the ball.
E) weight of the bat.
Some light switches that glow in the dark after the lights are turned off employ
A) fluorescence.
B) resonance.
C) incandescence.
D) all of the above
E) none of the above
Plutonium is radioactively toxic
A) in any form.
B) although less toxic than radium.
C) both of these
D) neither of these
Long ago a runaway greenhouse effect transformed the planet
A) Mercury.
B) Venus.
C) Mars.
D) all of the above
The distance a freely falling bowling ball falls each second
A) is about 5 m.
B) is about 10 m.
C) increases.
D) none of the above
A vertically-held sledge hammer is easier to balance when the heavier end is
A) on your hand.
B) at the top, away from your hand.
C) same either way
A motorcycle moving at 50 km/h skids 10 m with locked brakes. How far will it skid
with locked brakes when traveling at 150 km/h?
A) 10 m
B) 30 m
C) 50 m
D) 90 m
A weight watcher who normally weighs 400 N stands on top of a very tall ladder so she
is one Earth radius above Earth's surface. How much is her weight there?
A) 0
B) 100 N
C) 200 N
D) 400 N
E) none of the above
Nellie pulls with a force of 50 N on a horizontal rope tied to a tree at rest. The net force
on the rope is
A) 50 N and rope tension is 0 N.
B) 50 N and rope tension is also 50 N.
C) zero and rope tension is 50 N.
D) zero and rope tension is also zero.
Impulse involves the time that a force acts, whereas work involves the
A) distance that a force acts.
B) time and distance that a force acts.
C) acceleration that a force produces.
