Assume that 10 J of work pushes a charge initially at rest into an electric field. If the
charge is then released, it flies back to its starting position with a kinetic energy of
A) zero.
B) 5 J.
C) 10 J.
D) more than 10 J.
E) need more information.
Interference effects are less visible for thick films because the reflected waves
A) from the bottom surface are too dim.
B) become too dispersed.
C) are out of phase with one another.
D) are too displaced to interfere.
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.
According to relativity theory, you can experience a longer youth when you
A) are near a black hole.
B) are near a very large gravitational field.
C) travel at nearly the speed of light.
D) all of the above
E) none of the above
Millikan was able to stop falling oil droplets in their paths by
A) opposing electric and gravitational forces.
B) magnetic repulsion.
C) both of these
D) neither of these
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
If the color spectrum ranges from red to violet, then it ranges from
A) low frequencies to high frequencies.
B) long wavelengths to short wavelengths.
C) both of these
D) neither of these
Which can undergo diffraction?
A) photons.
B) electrons.
C) positrons.
D) all of the above
E) none of the above
You shine a beam of monochromatic light from Earth to an astronaut friend in orbit.
The light your friend receives, relative to light from an equivalent source on the
spaceship, is slightly
A) slower in speed.
B) higher in speed.
C) neither of these
Newton’s law of cooling applies to objects undergoing
A) cooling.
B) warming.
C) both of these
D) neither of these
If an object is placed exactly halfway between Earth and the Moon, it would fall toward
the
A) Earth.
B) Moon.
C) neither of these
If the atmosphere were about 40 times thicker, the Sun at noon would appear
A) red-orange.
B) orange-green.
C) green-blue.
D) blue-violet.
To totally convert a given amount of mechanical energy into heat is
A) possible.
B) impossible.
C) need more information
D) none of the above
The idea in fission-bomb design is to
A) form a supercritical mass from one or more subcritical masses.
B) bring neutrons and subcritical uranium together.
C) both of these
D) neither of these
The sky is usually the deepest blue
A) just before a rainstorm.
B) during a rainstorm.
C) just after a rainstorm.
D) just before sunset.
E) when the air is humid.
A hollow spherical planet is inhabited by people who live inside it, where the
gravitational field is zero. When a very massive spaceship lands on the planet’s surface,
inhabitants find that the gravitational field inside the planet is
A) still zero.
B) non-zero, directed toward the spaceship.
C) non-zero, directed away from the spaceship.
A large and a small person wish to parachute at equal terminal velocities. The larger
person should
A) get a larger parachute.
B) jump lightly.
C) pull upward on the supporting strands to decrease the downward net force.
D) jump first from the plane.
Ninety-five percent of light incident on a mirror is reflected. How much light is
reflected when three of these mirrors are arranged so light reflects from one after the
other?
A) 81%
B) 85%
C) 86%
D) 90%
E) 95%
Heisenberg’s uncertainty principle applies to
A) momentum and position.
B) energy and time.
C) both of these
D) neither of these
When the frequency of light matches the natural frequency of molecules in a material,
light is
A) absorbed.
B) transmitted.
C) reflected.
D) none of the above
Magnetic field lines about a current-carrying wire
A) extend radially from the wire.
B) circle the wire in closed loops.
C) both of these
D) neither of these
Which of the following isotopes is radioactive?
A) Carbon-12
B) Carbon-14
C) both of these
D) neither of these
According to the special theory of relativity, all laws of nature are the same
A) in all reference frames.
B) for both linear or circular motion.
C) in all uniformly moving reference frames.
D) all of the above
E) none of the above
Standing at the shore of a still lake, the reflected view of scenery on the other side of
the lake is the view you would see if you were upside down with your eye in the line of
sight
A) where it already is.
B) at the surface of the water where the light reflects.
C) directly beneath you, as far below water level as you are above.
D) close to the distant shore.
E) none of the above
The power required to exert 4-N force over 3 meters in 2 seconds is
A) 4 W.
B) 6 W.
C) 8 W.
D) 12 W.
E) none of the above
In a hydraulic-press operation, it is impossible for the
A) output displacement to exceed the input displacement.
B) force output to exceed the force input.
C) energy output to exceed the energy input.
D) output piston’s speed to exceed the input piston’s speed.
E) none of the above
A light source blinks with a certain frequency in its own frame of reference, and the
speed of light in that frame is c. When the light source approaches you, you observe an
increase in
A) both speed of light and frequency of blinking.
B) speed of light, but not frequency of blinking.
C) frequency of blinking, but not speed of light.
Compared to sea level, water in an open pot in the mountains boils at
A) a higher temperature.
B) a lower temperature.
C) the same temperature.
D) none of the above
An excited atom decays to its ground state and emits a photon of green light. If instead
the decay is to an intermediate state, then the light emitted could be
A) red.
B) violet.
C) blue.
D) any of the above
E) none of the above
Figure E-5
A small bead slides without friction along the wire shown. It begins at A and slides by
gravity past B, which doesn’t touch the rest of the wire. The potential energy of the bead
is greatest at point
1) A,
2) B,
3) C,
4) D,
5) E,
and the bead has its maximum momentum at point
6) A.
7) B.
8) C.
9) D.
When you jump from an elevated position you usually bend your knees upon reaching
the ground, which makes the time of the contact about 10 times that of a stiff-legged
landing. In this way the average force your body experiences is
A) less than 1/10 as great.
B) more than 1/10 as great.
C) about 1/10 as great.
D) about 10 times as great.
A water-filled paper cup held in a flame will not catch fire. This is because
A) the inside of the paper is wet.
B) water is an excellent conductor of heat.
C) paper is a poor conductor of heat.
D) the paper cup cannot become appreciably hotter than the water it contains.
The quality of a musical note has to do with its
A) loudness.
B) frequency.
C) harmonics.
D) amplitude.
E) none of the above
A ball gains speed while rolling down a hill due mainly to
A) its rotational inertia.
B) its angular acceleration.
C) a balanced torque.
D) an unbalanced torque.