An object has gravitational potential energy due to its
A) speed.
B) acceleration.
C) momentum.
D) location.
E) none of the above
The rule stating that the sum of two emitted frequencies in an atomic spectrum equals a
third frequency is consistent with
A) momentum conservation.
B) energy conservation.
C) Planck’s constant.
D) none of the above
A temperature difference of 10 Celsius degrees is also equal to a temperature difference
of 10 on the
A) Fahrenheit scale.
B) Kelvin scale.
C) both of these
D) neither of these
Science later greatly advanced when Galileo favored
A) philosophical discussions over experiment.
B) experiment over philosophical discussions.
C) nonmathematical thinking.
D) none of the above
The geometry of our universe is
A) flat.
B) positively curved.
C) negatively curved.
D) all of the above
E) none of the above
A ball rolled along a horizontal surface maintains a constant speed because
A) its velocity remains constant.
B) no horizontal force acts on it.
C) of inertia.
A wiggle in both space and time is a
A) vibration.
B) wave.
C) both of these
D) neither of these
A bullet is dropped into a river from a very high bridge at the same time as another
bullet is fired straight downward from a rifle. Neglecting air resistance, the acceleration
just before striking the water is
A) greater for the dropped bullet.
B) greater for the fired bullet.
C) the same for each bullet.
D) none of the above
Neglecting air resistance, a ball projected straight upward so it remains in the air for 10
seconds needs an initial speed of
A) 50 m/s.
B) 60 m/s.
C) 80 m/s.
D) 100 m/s.
E) 110 m/s.
The total momentum of a flock of identical birds could be zero only if the birds are
A) taking off from the ground.
B) flying in the same direction.
C) flying in different directions.
D) very tired and coming down to rest.
When a rocket ship gaining speed in outer space runs out of fuel, it
A) gains speed for a short time, then slows down to a constant velocity.
B) gains speed for a short time, slows down, and eventually stops.
C) no longer gains speed.
Two vehicles with equal magnitudes of momentum traveling at right angles to each
other undergo an inelastic collision. The magnitude of momentum for the combined
wreck is
A) the same as the magnitude of momentum of either car before collision.
B) less than the magnitude of momentum of either car before collision.
C) greater than the magnitude of momentum of either car before collision.
D) none of the above
A ball is projected 125 meters straight upward and then falls the same distance back to
its starting point. Neglecting air resistance, its total time in the air is about
A) 5 s.
B) 10 s.
C) 15 s.
D) more than 20 s.
A lamp rated 23W 120V means that it will deliver 23 W
A) when the voltage across it is 120 V.
B) whether or not it is connected to 120 V.
C) as long as the current is ac.
D) none of the above
Magnification is greater with a lens having a
A) high index of refraction.
B) low index of refraction.
C) same in each
Compared with sea-level cooking, in cooking eggs by boiling in mountain regions you
should boil the eggs
A) with a hotter flame.
B) for a shorter time.
C) for a longer time.
D) all of the above
E) none of the above
About what percentage of molecules in the air make up the atmosphere below a
6-kilometer altitude?
A) 20%
B) 30%
C) 40%
D) 50%
E) more than 50%
If wavelengths of emitted light become longer, the energy per photon of light
A) increases.
B) remains constant.
C) decreases.
D) none of the above
A substance that cools down faster than others has a
A) low specific heat capacity.
B) high specific heat capacity.
C) either of these
D) neither of these
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.
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
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
Magnetism is due to the motion of electrons as they
A) move around the nucleus.
B) spin on their axes.
C) both of these
D) neither of these
The fact that more radioactive particles are spewed from coal-fired power plants than
nuclear fission reactors is evidence that
A) coal is more radioactive than uranium.
B) coal-fired plants have less shielding.
C) coal-fired plants are more numerous.
D) all of the above
E) none of the above
Which will leak more neutrons?
A) two separate lumps of uranium.
B) the same two lumps stuck together.
C) both the same
The more we know about a particle’s position, the less we know about its
A) speed.
B) momentum.
C) kinetic energy.
D) all of the above
E) none of the above
The time it takes a car to attain a speed of 30 m/s when accelerating from rest at 2 m/s2
is
A) 2 s.
B) 15 s.
C) 30 s.
D) 60 s.
E) none of the above
A tiny gun made of a strong but very light material fires a bullet more massive than the
gun itself. For such a weapon
A) the target would be safer than the shooter.
B) recoil problems would be lessened.
C) conservation of energy would not hold.
D) conservation of momentum would not hold.
E) both conservation of energy and momentum would not hold.
Heat energy travels from an object with a high
A) internal energy to an object with a lower internal energy.
B) temperature to an object with a lower temperature.
C) both of the above
D) none of the above
Quantization of electron energy states in an atom is better understood in terms of the
electron’s
A) wave nature.
B) particle nature.
C) neither of these
Two students engaged in a tug-of-war each pull a rope in opposite directions with a
force of 400 N. The net force on the rope is
A) zero and rope tension is 400 N.
B) zero and rope tension is 800 N.
C) 400 N and rope tension is 800 N.
D) 400 N and rope tension is also 400 N.
One joule per coulomb is a unit of
A) energy.
B) power.
C) voltage.
D) current.
E) resistance.
Gamma rays are emitted by way of
A) ionizing radiation.
B) transitions within an atom’s innermost electrons.
C) transitions within the atomic nucleus.
D) none of the above
Earth and the Moon are attracted to each other by gravitational force. The more-massive
Earth attracts the less-massive Moon with a force
1) less than the force that Moon exerts on Earth.
2) greater than that of the force that Moon exerts on Earth.
3) the same as that of the force that Moon exerts on Earth.
This is in accord with
4) the law of inertia.
5) Kepler’s Laws.
6) the conservation of energy.
7) the fact that both Moon and Earth orbit about a common point, the center of mass.
8) the law of action and reaction.
If the voltage produced by a generator alternates, it does so because
A) unlike a battery, it produces alternating current.
B) the changing magnetic field that produces it alternates.
C) of alterations in the mechanical energy input.
D) all of the above
E) none of the above