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The buoyant force on a one-ton blimp hovering in air is
A) zero.
B) one ton.
C) less than one ton.
D) more than one ton.
In practice, a good insulator
A) stops heat flow.
B) slows heat flow.
C) speeds negative heat flow.
D) all of the above
As we become older, the frequency range of human hearing
A) decreases.
B) increases.
C) remains relatively constant.
The primary of a transformer
A) has an iron core.
B) may or may not have an iron core.
C) has more turns of wire than the secondary.
D) none of the above
Two planets in space gravitationally attract each other. If both the masses and distances
are doubled, the force between them is
A) one-quarter.
B) half as much.
C) twice as much.
D) four times as much.
E) none of the above
A sheet of paper can be quickly jerked beneath a container of milk without toppling,
which best demonstrates
A) net force.
B) the difference between force and mass.
C) inertia.
A heavy block at rest is suspended by a vertical rope. When the block accelerates
upward by the rope, the rope tension
A) is less than its weight.
B) equals its weight.
C) is greater than its weight.
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.
Which of the following is quantized?
A) energy
B) radiation
C) number of atoms in a gold bar
D) electric charge
E) all of the above
Figure M-3
A rock is sinking to the bottom of the lake. The buoyant force is greater at point
1) A.
2) B.
3) C.
4) equal at all levels.
This follows from the fact that
5) pressure increases with depth.
6) the same weight of water is displaced at any depth.
7) the water is appreciably more compressed with increasing depth.
8) position B provides a moderate answer, between the extremes.
The amount of solar energy per square meter atop the atmosphere at right angles to the
Sun's rays is about
A) 700 joules.
B) 1000 joules.
C) 1400 joules.
D) much more than 1400 joules.
The ideal efficiency for a heat engine operating between the temperatures of 227C and
27C is
A) 20%.
B) 25%.
C) 40%.
D) 88%.
E) none of the above
If Earth's mass decreased to one-half its original mass with no change in radius, then
your weight would
A) decrease to one-quarter.
B) decrease to half.
C) stay the same.
D) none of the above
Which of the following contracts most when the temperature is decreased? Equal
volumes of
A) iron.
B) wood.
C) water.
D) helium.
E) all contract the same.
To connect a pair of resistors so their equivalent resistance (the single resistor having
their combined value) will increase, connect them in
A) series.
B) parallel.
C) either of these
The high temperature of Earth's interior is mainly due to
A) great internal pressure.
B) friction, as plates move past one another.
C) the Earth's natural heat.
D) radioactive processes.
When we say energy levels in an atom are discrete, we mean that their energy levels are
well defined and
A) separate from one another.
B) separated by equal energy increments.
C) continuous.
D) private.
The difference between Newton's law as a proportion and an equation involves
A) the constant G.
B) the equal sign.
C) one being a vector and the other not.
D) magnitude and direction.
The nucleus that has the greatest mass per nucleon is
A) hydrogen.
B) iron.
C) lead.
D) uranium.
E) plutonium.
If an object's mass is decreasing while a constant force is applied to the object, the
acceleration
A) decreases.
B) increases.
C) remains the same.
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
A heat engine would have 100% efficiency if its low-temperature reservoir were
A) as hot as its reservoir.
B) at absolute zero.
C) either of these
D) neither of these
A truly educated person is knowledgeable about
A) science.
B) the arts.
C) religion.
D) all of the above
When you blow air between a pair of closely-spaced Ping-Pong balls suspended by
strings, the balls will swing
A) toward each other.
B) away from each other.
C) away from the air stream, but not necessarily toward or away from each other.
Important support for general relativity came from studies of the precession of the orbit
of
A) Mercury.
B) Venus.
C) Earth.
D) Mars.
E) asteroids.
The net force exerted on a car traveling in a circular path at constant speed is
A) directed forward, in the direction of travel.
B) directed toward the center of the curve.
C) zero because the car is not accelerating.
D) none of the above
A common pulley acts similar to a
A) hydraulic press.
B) gear.
C) common lever.
D) tension producer.
Two lightning bolts are seen to strike two distant locations at the same time. Seen from
a different location, the two lightning bolts
A) will also be seen at the same time.
B) will not be seen at the same time.
C) may or may not be seen at the same time.
In a spaceship that accelerates at g far from gravitational influences, with the effort it
takes on Earth to do 20 pushups, you could comfortably do
A) less than 20 pushups.
B) 20 pushups.
C) more than 20 pushups.
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.
10) E.
Stored potatoes, beets, and rutabagas in an unheated well-insulated room can be
protected from freezing by having in the room
A) blocks of foam plastic.
B) large tubs of water.
C) an ample supply of fire wood.
D) none of the above
Most of the matter in the universe is in the
A) solid phase.
B) liquid phase.
C) gaseous phase.
D) plasma phase.
E) none of the above
Which light-emitting process is characterized by an afterglow?
A) incandescence.
B) fluorescence.
C) phosphorescence.
D) resonance.
E) none of the above
White-light LEDs employ
A) phosphors.
B) white-emitting diodes.
C) extra-high electrical barriers.
D) none of the above
The amount of current in an LED bulb rated 10.5W 120V is
A) less than 1 A.
B) about 1 A.
C) more then 1 A.
