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The superposition of identical waves affects
A) amplitude.
B) wavelength.
C) speed.
D) all of the above
E) none of the above
Answer:
Which of these is correct?
A) a piece of solid iron floats in molten iron.
B) a piece of solid aluminum floats in molten aluminum.
C) a piece of ice floats in water.
D) all the above
E) none of the above
Answer:
Two identical gliders slide toward each other on an air track. One moves at 1 m/s and
the other at 2 m/s. They collide, stick, and moves at
A) 1/2 m/s.
B) 1/3 m/s.
C) 1/6 m/s.
D) 3/4 m/s.
E) 1.5 m/s.
Answer:
Light travels from one place to another along a path of least
A) distance.
B) time.
C) effort.
D) expense.
E) complication.
Answer:
What is the acceleration of a car that starts from rest and 5 seconds later reaches a speed
of 20 m/s?
A) 1 m/s2
B) 2 m/s2
C) 3 m/s2
D) 4 m/s2
E) 5 m/s2
Answer:
A sandbag motionless in outer space is hit by a three-times-as massive sandbag moving
at 12 m/s. They stick together and move at a speed of
A) 3 m/s.
B) 4 m/s.
C) 6 m/s.
D) 8 m/s.
E) none of the above
Answer:
A projectile that is fired vertically from the surface of Earth at 5 km/s will
A) go into circular about Earth.
B) go into an elliptical orbit about Earth.
C) rise and fall back to Earth's surface.
D) none of the above
Answer:
When a karate chop breaks a board with a 3000-N blow, the amount of force that acts
on the hand is
A) zero.
B) 1500 N.
C) 3000 N.
D) 6000 N.
Answer:
The accelerations possible for a ball on an inclined plane
A) range from zero to g.
B) range from g to infinity.
C) have no limit.
Answer:
Thrust a magnet into the opening of a rubber band and it
A) rotates.
B) then has a current in it.
C) both of these
D) neither of these
Answer:
If gold were used as nuclear fuel, it would be best
A) fused.
B) fissioned.
C) either of these
Answer:
Some double-pane airplane windows darken when the inner pane is rotated. The panes
are
A) thin films.
B) Polaroid filters.
C) optical fibers.
Answer:
Magnification is greater with a lens having a
A) high index of refraction.
B) low index of refraction.
C) same in each
Answer:
The sky is blue because air molecules in the sky act as tiny
A) mirrors which reflect only blue light.
B) optical tuning forks that scatter blue light.
C) sources of white light.
D) prisms.
E) none of the above
Answer:
An astronaut falling into a black hole would see the universe
A) red-shifted.
B) blue-shifted.
C) with no shift at all.
Answer:
Dr. Chuck projects a ball horizontally from a lab bench. If the projection speed of the
ball were greater, the time in the air would be
A) less.
B) the same.
C) greater.
Answer:
The correspondence principle applies to
A) theories of submicroscopic phenomena.
B) theories of macroscopic phenomena.
C) all good theories.
Answer:
Phil Physiker standing at the edge of a cliff throws one ball straight up and another ball
straight down, both with the same speed. Neglecting air resistance, which ball hits the
ground below with the greater speed?
A) the one thrown upward
B) the one thrown downward
C) neither, both hit with the same speed
Answer:
The impulse-momentum relationship is a direct result of
A) Newton's 1st law.
B) Newton's 2nd law.
C) Newton's 3rd law.
D) Newton's law of gravity.
Answer:
An industrial flywheel has a greater rotational inertia when most of its mass is
A) nearer the rim.
B) nearer the axis.
C) uniformly spread out as in a disk.
Answer:
Centrifugal forces are an apparent reality to observers in a reference frame that is
A) moving at constant velocity.
B) an inertial reference frame.
C) at rest.
D) rotating.
E) none of the above
Answer:
Wind blowing over the top of a hill
A) increases atmospheric pressure there.
B) decreases atmospheric pressure there.
C) does not affect atmospheric pressure there.
Answer:
If you throw a stone horizontally from the top of a cliff, one second after leaving your
hand its vertical distance below the top of the cliff is
A) 5 m.
B) 10 m.
C) 15 m.
Answer:
Doubling the thickness (diameter) of a rope will multiply its strength by
A) 1/2.
B) 1.
C) 2.
D) 3.
E) 4.
Answer:
The current in two identical light bulbs connected in series is 0.25 A. The voltage across
both bulbs is 110 V. The resistance of a single light bulb is
A) 22 ohms.
B) 44 ohms.
C) 220 ohms.
D) 440 ohms.
E) none of the above
Answer:
The strength of an induced electric or magnetic field depends on
A) strength of magnetic poles.
B) alignment of magnetic domains.
C) rate of change of the induced field.
D) all of the above
E) none of the above
Answer:
When a nucleus of U-238 absorbs a neutron and becomes U-239, a beta emission, then
another beta emission results in
A) Th-239.
B) Pa-239.
C) U-235.
D) Pu-239.
E) Pb-206.
Answer:
Fluorescent minerals on display in museums are illuminated with
A) infrared light.
B) ultraviolet light.
C) often either or both
D) none of these
Answer:
If you thrust a magnet into a closed loop of wire, the loop will
A) rotate.
B) have a current in it.
C) both of these
D) neither of these
Answer:
Compared to the recoiling cannon, a fired cannonball has a
A) greater momentum.
B) greater kinetic energy.
C) smaller speed.
D) all of the above
Answer:
Compared to the mass of a hydrogen atom, the mass of an oxygen atom is
A) 8 times as great.
B) 12 times as great.
C) 16 times as great.
D) appreciably more than 16 times as great.
Answer:
A 1-kg rock is suspended from the tip of a horizontal meterstick at the 0-cm mark so
that the meterstick barely balances like a seesaw when its fulcrum is at the 12.5-cm
mark. From this information, the mass of the meterstick is
A) 1/4 kg.
B) 1/2 kg.
C) 3/4 kg.
D) 1 kg.
E) none of the above
Answer:
An efficient step-down transformer decreases
A) power.
B) energy.
C) both of these
D) neither of these
Answer:
Compressions and rarefactions normally travel in
A) the same direction in a wave.
B) opposite directions in a wave.
C) right angles to the wave direction.
D) none of the above
Answer:
