The force responsible for a car moving steadily along a no-friction icy banked curve is
due to
A) centrifugal effects.
B) the normal force at right angles to the curved surface.
C) the radial component of the normal force.
D) none of the above
Answer:
The Lorentz factor, γ,
A) is always greater than 1 for any speed greater than zero.
B) lets the time-dilation equation be expressed t = γ t0.
C) both of these
D) none of these
Answer:
A semiconductor can be
A) a conductor.
B) an insulator.
C) both of these
D) neither of these
Answer:
Which potato cooks faster in boiling oil?
A) a whole potato.
B) a sliced potato.
C) both the same
Answer:
The work done in pushing a TV set a distance of 2 m with an average force of 20 N is
A) 2 J.
B) 10 J.
C) 20 J.
D) 40 J.
E) 800 J.
Answer:
Four amperes of current exist in the primary coil of a transformer. The voltage across
the primary coil is 120 V. What is the power output of the secondary coil?
A) 30 W
B) 120 W
C) 480 W
D) 960 W
E) need more information
Answer:
Surrounding every magnet is
A) a magnetic field.
B) an electric field.
C) both of these
D) neither of these
Answer:
The work you do when pushing a shopping cart twice as far while applying twice the
force is
A) half as much.
B) twice as much.
C) four times as much.
D) the same amount.
Answer:
At the beach you see a friend facing away from you. Keeping quiet you can cause her to
turn around by
A) staring intently at her back.
B) tossing small pebbles at her back.
C) although staring will be less effective, both will affect a turn-around.
D) none of the above
Answer:
To make taffy apples, a candymaker buys 100 kg of large apples rather than 100 kg of
small apples. That means she will need
A) less taffy.
B) more taffy.
C) the same amount of taffy.
Answer:
The electrical force on a 2-C charge is 60 N. The electric field where the charge is
located is
A) 20 N/C.
B) 30 N/C.
C) 60 N/C.
D) 120 N/C.
E) 240 N/C.
Answer:
Strictly speaking, more fuel is consumed by your car if the air conditioner, headlights,
or even a radio is turned on. This statement is
A) false.
B) true only if the car’s engine is running.
C) true.
Answer:
The rate at which energy is transferred is
A) power.
B) electromagnetic induction.
C) transformation.
D) none of the above
Answer:
The radiation curve for a red hot fire-place poker peaks in the
A) infrared region.
B) green region.
C) ultraviolet region.
Answer:
Just as water flows from a region of high pressure to a region of low pressure, electric
charge flows from a region of
A) high electric pressure to a region of low electric pressure.
B) high potential energy to a region of low potential energy.
C) deep to shallow regions.
D) all of the above
Answer:
The speed of light is
A) relative to the frame of reference from which it is measured.
B) a speed approached but never quite reached by photons.
C) constant for all observers.
Answer:
When a ball falls downward, it may have a net force
A) equal to its weight.
B) of zero.
C) equal to its weight minus air drag.
D) any of the above
E) none of the above
Answer:
Tides caused mainly by the Moon occur in Earth’s
A) oceans.
B) atmosphere.
C) interior.
D) all of the above
Answer:
Whether a truck comes to a stop by crashing into a haystack or a brick wall, the impulse
is
A) greater with the haystack.
B) greater with the brick wall.
C) both the same
Answer:
A wave travels an average distance of one meter in one second with a frequency of 1
hertz. Its amplitude is
A) less than 1 meter.
B) 1 meter.
C) more than 1 meter.
D) need more information
Answer:
If you toss a coin straight upward in train that gains speed while the coin is in the air,
the coin will land
A) as if you were at rest.
B) in front of you.
C) in back of you.
Answer:
A difference between linear momentum and angular momentum involves
A) a radial distance.
B) two types of speed.
C) both of these
D) neither of these
Answer:
Light is emitted when an electron
A) is boosted to a higher energy level.
B) makes a transition to a lower energy level.
C) accelerates to a medium energy level.
D) none of the above
Answer:
A pair of hydrogen nuclei fused together produces
A) helium.
B) lithium.
C) beryllium.
D) carbon.
E) iron.
Answer:
Vibrating membranes relate to which instrument?
A) violin
B) drum
C) oboe
D) all of the above
E) none of the above
Answer:
If all people, animals, trains and trucks all over the world began to walk or run towards
the east (opposite the direction of Earth’s spin), then
A) Earth would spin a bit faster.
B) Earth would spin a bit slower.
C) Earth’s spin would not be affected at all.
Answer:
A car traveling along the highway brakes to a stop over a certain distance. More braking
force is required if the car has
A) more mass.
B) more momentum.
C) less stopping distance.
D) all of the above
E) none of the above
Answer:
The work you do when pushing a shopping cart a given distance while applying twice
as much force is
A) half as much.
B) twice as much.
C) four times as much.
D) the same amount.
Answer:
If a weighted air-filled balloon sinks in deep water, it will
A) likely sink to an equilibrium level before reaching bottom.
B) likely burst if water pressure is great enough.
C) be acted on by a continuously decreasing buoyant force.
D) none of the above
Answer:
At one instant a heavy object in air is moving upward at 50 m/s. One second later its
speed is approximately
A) 40 m/s.
B) 50 m/s.
C) 55 m/s.
D) 60 m/s.
Answer:
Heat energy is measured in units of
A) joules.
B) calories.
C) both of these
D) neither of these
Answer:
If a cup of tea at room temperature, 24oC is heated until it has twice the internal energy,
unlike a piece of metal, its temperature will be
A) 48oC.
B) 100oC.
C) 321oC.
D) 594oC.
E) none of the above
Answer:
If an electric toaster rated at 110 V is accidently plugged into a 220-V outlet, the current
drawn by the toaster will be
A) half its normal value.
B) the same as its normal value.
C) twice its normal value.
D) none of the above
Answer:
When two lamps are connected in series to a battery, the electrical resistance that the
battery senses is
1) more than the resistance of either lamp,
2) less than the resistance of either lamp,
And when the same two lamps are connected in parallel to a battery, the electrical
resistance that the battery senses is
3) more than the resistance of either lamp.
4) less than the resistance of either lamp.
5) none of these
Answer:
Light from a laser is
1) monochromatic.
2) in phase.
3) coherent.
4) all of the above.
Compared to the energy put into a laser, the energy of the laser beam is
5) usually much more.
6) much less.
7) the same.
Answer:
The energy released by the Sun is the outcome of atomic nuclei
1) breaking apart,
2) combining together,
and radioactive by-products are a chief result of atomic nuclei
3) breaking apart.
4) combining together.
5) doing neither.
Answer:
A freight car rolls along a horizontal track at 12 m/s and hooks onto an identical freight
car at rest. The coupled cars will
1) come to a quick stop,
2) roll at 3 m/s,
3) roll at 6 mph,
4) roll at 12 ms,
which makes sense because
5) in the absence of external forces, trains in motion continue in motion.
6) the acceleration of the car at rest equals the force of impact divided by the two
masses.
7) since twice the mass is moving, the speed will be half for the same momentum.
8) energies before and after the collision remain the same.
Answer:
Figure M-2
Two vases of different shapes each contain a goldfish. In the position shown, the fish
that will feel the greatest pressure is
1) A
2) B
3) both experience the same
because
4) the weight of water is greater in vase B.
5) fish A is nearer to the bottom of the vase.
6) both fish are at the same depth.
Answer:
We can apply the equationFt = change in (mv) to the case of a baseball player striking a
pitched ball. To impart the maximum change in momentum, mv, to the ball, the batter
hits the ball with the greatest force he can muster and he also
1) extends the time of contact as much as possible by “following through.”
2) makes the time of contact as short as possible, thereby increasing the force.
3) none of the above!
In the impulse-momentum equation applied to hitting the ball, the “v” represents
4) the velocity of the bat.
5) the velocity of the ball.
6) a vector quantity.
Answer:
A rifle is fired straight downward from a high-altitude balloon. If the bullet leaves the
barrel at 100 m/s, then its speed one second later (neglecting air resistance) will be
about
1) 10 m/s
2) 100 m/s
3) 105 m/s
4) 110 m/s
and its distance below will be about
5) 5 m.
6) 100 m.
7) 105 m.
8) 110 m.
9) 120 m.
Answer:
Sound travels through the air in the form of
1) transverse waves,
2) longitudinal waves,
and radio signals travel through the air in the form of
3) transverse waves.
4) longitudinal waves.
Answer:
Refraction occurs for both sound and light. When refraction occurs there is a change in
1) frequency.
2) wavelength.
3) speed.
4) all of the above.
When sound travels faster near the ground than above, bending of sound tends to be
5) upward.
6) downward.
7) neither of these.
Answer:
When light is gravitationally red or blue shifted, that which is shifted is
1) wave frequency,
2) wavelength,
3) wave energy,
4) all of these,
5) none of these,
and when light is Doppler shifted, that which is shifted is actually
6) wave frequency.
7) wave amplitude.
8) both of these.
9) none of these.
Answer:
Figure M-5
When the bent wire is lowered in the water and then raised to the surface, a further
attempt to raise it causes the spring to
1) stretch
2) contract
3) stay the same
due to water’s
4) buoyant force.
5) surface tension.
6) capillarity.
Answer:
A ball is thrown against a wall, bounces off, and is caught. The number of impulses
acting on the ball is
1) one.
2) two.
3) three.
4) none.
The greatest impulse occurs when the ball
5) is thrown.
6) bounces against the wall.
7) is caught.
8) is zero for each.
9) is nonzero, but the same for each case.
Answer:
Evaporation of water from a tea kettle takes place
1) at the surface of the water,
2) at the bottom of the water,
3) throughout the water,
whereas boiling takes place
4) at the surface of the water.
5) at the bottom of the water.
6) throughout the water.
Answer:
When heavy elements such as uranium undergo fission, there is an accompanying
1) loss of mass,
2) gain of mass,
3) no change in mass,
and when light elements such as hydrogen undergo fusion, there is an accompanying
4) loss of mass.
5) gain of mass.
6) no change in mass.
Answer:
In referring to how much matter a body contains, we use the term
1) volume
2) mass
3) weight
and the force of gravitational attraction upon a body is
4) weight.
5) volume.
6) mass.
Answer:
To say that an object is moving at constant velocity means that it is
1) at rest,
2) moving at an unchanging speed,
3) moving at an unchanging speed in a straight-line path,
and that its acceleration is
4) zero.
5) constantly increasing (or decreasing).
6) uniform.
Answer:
Figure E-3
To lift the 5000-N block, the man finds that he must pull 10 m of rope through his
hands for every 1 m the block rises. Neglecting the weights of the pulleys and friction,
how hard must the man pull on the rope to raise the block?
1) 5 N
2) 50 N
3) 500 N
4) 5000 N
which is in accord with
5) Newton’s second law.
6) that impulse equals change in momentum.
7) (F d) input = (F d) output.
8) mechanical energy can be stored as potential energy.
Answer: