A high-frequency sound source produces a high
A) speed.
B) amplitude.
C) pitch.
D) all of the above
E) none of the above
A 60-W and a 100-W light bulb are connected in series to a 120-V outlet. Which bulb
draws more current?
A) 60-W bulb
B) 100-W bulb
C) both the same.
To illustrate regelation with ice it is important that a
A) wire is used.
B) string is used.
C) either of these
D) none of the above
An elephant radiates less heat for its size than smaller animals because
A) its radiating area is small compared to its volume.
B) its radiating area is large compared to its volume.
C) it is taller than smaller animals.
D) it weighs more than smaller animals.
The formula △p △x≥ h tells us that the product of △p and △x cannot be
A) less than h
B) greater than h
C) equal to h
A jack system will increase the potential energy of a heavy load by 1000 J with a work
input of 2000 J. The efficiency of the jack system is
A) 10%.
B) 20%.
C) 50%.
D) 80%.
E) need more information
A tuning fork of frequency 200 hertz can resonate if an incident sound wave has a
frequency of
A) 100 hertz.
B) 200 hertz.
C) both of these
D) neither of these
The spectral lines are more distinct when viewed in a mercury vapor lamp under
A) high pressure.
B) low pressure.
C) same for each
Infrared waves are often called heat waves because they
A) emanate from relatively hot sources.
B) consist of frequencies lower than those of visible light.
C) induce resonance in molecules and increase internal energy in a substance.
D) are the predominant waves emitted by the sun.
An excited atom decays to its ground state and emits a photon of red 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 these
E) none of these
When a solid is changed to a liquid, the solid
A) releases energy.
B) absorbs energy.
C) both of these
D) neither of these
The period of an Earth satellite depends on the satellite’s
A) mass.
B) weight on Earth.
C) radial distance from Earth.
D) all of the above
E) none of the above
Open spaces in ice crystals contribute to
A) decreased density.
B) increased density.
C) neither of these
The factor most directly responsible for making a black hole invisible is its
A) size.
B) mass.
C) color.
D) surface escape velocity.
E) none of the above
When you walk at an average speed of 4 m/s, in 5 s you’ll cover a distance of
A) 2 m.
B) 10 m.
C) 15 m.
D) 20 m.
Two identical golf carts move at different speeds. The faster cart has twice the speed
and therefore has
A) twice the kinetic energy.
B) four times the kinetic energy.
C) eight times the kinetic energy.
D) none of the above
When a load of wood is thrown overboard from a boat in a swimming pool, the pool
level
A) rises.
B) falls.
C) remains unchanged.
When water vapor changes phase to become water in a cloud, the surroundings become
A) cooler.
B) warmer.
C) both of these
D) neither of these
A 2000-kg car experiences a braking force of 10,000 N and skids to a stop in 6 seconds.
The speed of the car just before the brakes were applied was
A) 1.2 m/s.
B) 15 m/s.
C) 30 m/s.
D) 45 m/s.
E) none of the above
If an antimatter meteor of mass m were to strike the Earth, the amount of radiant energy
produced would be
A) less than mc2.
B) mc2.
C) 2mc2.
D) none of the above
Adiabatic processes occur in Earth’s
A) atmosphere.
B) oceans.
C) mantle.
D) all of the above
E) none of the above
The cooling effect inside a refrigerator is produced by
A) an electric motor that converts electrical energy to internal energy.
B) compressing the refrigeration gas.
C) vaporizing the refrigeration liquid.
D) proper insulation.
E) exchanging warmer air with colder air.
The stretching out of time due to motion is called time
A) stretching.
B) dilation.
C) contraction.
D) warp.
E) expansion.
When sound travels faster near the ground than above, bending of sound tends to be
A) upward.
B) downward.
C) to the left.
D) to the right.
E) none of the above
Iron is a poor choice of nuclear fuel because it releases
A) energy only when fused.
B) energy only when fissioned.
C) no energy when fused or fissioned.
If the Sun collapsed to a black hole, Earth’s gravitational attraction to it would be
A) more.
B) less.
C) the same.
A 1-kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force
that acts on the stone when it is halfway to the top of its path is about
A) 1/2 N.
B) 1 N.
C) 5 N.
D) 7.5 N.
E) 10 N.
The amount of current in a CFL rated 23W 120V is about
A) 0.2A.
B) 5.2A.
C) more than 5.2A.
A skipper on a boat sees wave crests passing the anchor chain every 5 seconds and
estimates the distance between crests is 15 m. What is the speed of the water waves?
A) 3 m/s
B) 5 m/s
C) 15 m/s
D) need more information
If you throw a ball straight downward (in the absence of air resistance), after leaving
your hand its acceleration is
A) less than 10 m/s2.
B) 10 m/s2.
C) greater than 10 m/s2.
An inventor proposes to equip an office with a polarized source of background music
and polarizing earplugs for non-listeners. His idea is
A) a good one that provides personal choice.
B) too expensive.
C) bothersome.
D) nonsense because sound cannot be polarized.
Materials generally become warmer when light is
A) absorbed by them.
B) reflected by them.
C) transmitted by them.
D) all of the above
E) none of the above
What is the force of gravity on a 500-N woman standing on Earth’s surface?
A) 50 N
B) 250 N
C) 500 N
D) 5000 N
E) none of the above
A fast-moving missile soaring overhead possesses
A) speed.
B) force.
C) both of these
D) neither of these