As a high-altitude balloon rises higher into the atmosphere, it undergoes a decrease in
A) volume.
B) density.
C) weight.
D) mass.
E) none of the above
Superconductors are noted for their
A) high electric resistance.
B) low electric resistance.
C) absence of electric resistance.
D) low cost.
E) bright colors.
A heavy truck and a small car rolling down a hill at the same speed are forced to stop in
the same amount of time. Compared with the force that stops the car, the force needed
to stop the truck is
A) greater.
B) smaller.
C) the same.
To weaken a bar magnet
A) drop it on a hard surface.
B) put it in hot flames.
C) whack it with a hammer.
D) all of the above
E) none of the above
The molecules in a room-temperature glass of water jostle around at
A) a great variety of speeds.
B) much the same rates of speed.
C) a very small range of speeds.
A person floats higher in the dense water of the Dead Sea because
A) less volume of water is displaced.
B) more volume of water is displaced.
C) of a greater buoyant force.
Acrobat Bart at the circus drops vertically onto the end of a see-saw, with his partner
Art equidistant from the fulcrum at the other end. Art is propelled straight upward a
distance twice that of Bart’s dropping distance. Neglecting inefficiencies we see
A) the masses of Art and Bart are equal.
B) Art has half the mass of Bart.
C) need more information
Support a horizontal toothpick at both ends. Then do likewise for a log of the same kind
of wood. There is more sag in the
A) toothpick.
B) log.
C) same in each
Magnification by a lens would be greater if light
A) propagated instantaneously.
B) traveled faster in glass than it does.
C) traveled slower in glass than it does.
D) beams spread less.
E) none of the above
Which of the following normally warms up fastest when heat is applied?
A) water
B) iron
C) glass
D) wood
E) all of the above
A lunar month is about 28 days. If the Moon were closer to Earth than it is now, the
lunar month would be
A) less than 28 days.
B) about 28 days.
C) more than 28 days.
D) need more information
Release a ball inside a freely falling elevator and it falls directly in front of you instead
of “falling to the floor,” because you, ball, elevator, and enclosed air are in free fall. If
you do the same with a helium-filled balloon, the balloon will
A) also remain in front of you.
B) press against the ceiling.
C) press against the floor.
D) slowly rise.
E) slowly fall.
What is conserved when a photon collides with an electron?
A) momentum
B) energy
C) both of these
D) neither of these
Which interacts more with high-frequency sounds?
A) large bells
B) small bells
C) both the same
If a critical mass of fissionable material in a spherical shape is flattened like a
hamburger, it will be
A) supercritical.
B) subcritical.
C) as critical.
Two billiard balls having the same mass and speed roll toward each other. What is their
combined momentum after they meet?
A) zero
B) half the sum of their original momentums
C) twice the sum of their original momentums
D) need more information
An iron core in a transformer
A) guides magnetic field lines.
B) shields unwanted external electric or magnetic fields.
C) separates the primary and secondary regions.
D) reduces energy losses.
When riding at constant velocity on a Segway electric vehicle, your center of mass is
A) slightly in front of the point between wheels below.
B) slightly behind the point between wheels below.
C) directly above the point between wheels below.
A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5-kg bowling ball
initially at rest. The bowling ball and putty then move with a momentum of
A) 0 kg m/s.
B) 1 kg m/s.
C) 2 kg m/s.
D) 5 kg m/s.
E) more than 5 kg m/s.
A lobster crawls onto a bathroom scale on the ocean floor. Its weight compared to its
weight above the surface is
A) greater.
B) less.
C) the same.
When a dishonest scientist reports false information, he or she
A) as in many other professions, will be excused by the scientific community.
B) gets no second chance in the scientific community.
C) is elevated in the scientific community.
To rotate a stubborn screw, it is best to use a screwdriver that has a
A) wide handle.
B) long handle.
C) smooth handle.
D) none of the above
If the rotational speed of a rotating habitat in space increases, the weight experienced by
occupants
A) decreases.
B) stays the same.
C) increases.
D) is always zero.
The most responsible factor for whether a substance takes the phase of solid, liquid,
gas, or plasma is its
A) composition.
B) atomic shell configuration.
C) temperature.
D) none of the above
According to the correspondence principle, a new theory must
A) overlap and agrees where the old theory works.
B) account for confirmed results from the old theory.
C) predict the same correct results as the old theory.
D) all of the above
E) none of the above
The net charge on a charged capacitor depends on
A) the area of the capacitor plates.
B) the distance between the capacitor plates.
C) the medium between the capacitor plates.
D) all of the above
E) none of the above
If the Sun became twice as massive, your attraction to the Sun would double and your
weight as measured on Earth would
A) double.
B) quadruple.
C) not change.
When a suction cup sticks to a wall it is
A) pulled to the wall by the vacuum.
B) pushed to the wall by the atmosphere.
C) both of these
D) neither of these
Compared to the photon that enters a pane of window glass, the photon that emerges is
A) the same photon.
B) an identical but different photon.
C) an altogether different photon.
D) none of the above
An asteroid exerts a 360-N gravitational force on a nearby spacecraft. If the spacecraft
moves to a position three times as far from the center of the asteroid, the force will be
A) zero.
B) 40 N.
C) 120 N.
D) 360 N.
E) 1080 N.
Two lamps with different filament thicknesses, and therefore different resistances, are
connected in series. Greater current is in the lamp with the
A) thick filament.
B) thin filament.
C) same in each
Whereas electric charges can be isolated, magnetic poles
A) can also.
B) cannot.
C) gather in clusters.
D) none of the above
During an eclipse of the Sun the high ocean tides on Earth are
A) extra high.
B) extra low.
C) not significantly different.
A 10-unit vector at 60o from the vertical has a vertical component with a magnitude
A) less than 10 units.
B) 10 units.
C) greater than 10 units.
The hottest star is the one that glows
A) red.
B) white.
C) blue.
D) need more information