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White-hot sparks from a 4th-of-July-type sparkler that strike your skin have relatively
A) high temperatures.
B) few molecules per spark.
C) low transfer of energy.
D) all of the above
E) none of the above
Strictly speaking, to weigh less in the Northern Hemisphere, you should move to a
location farther
A) north (toward the pole).
B) south (toward the equator).
C) east.
D) west.
When a light beam emerges from water into air, light speed
A) increases.
B) decreases.
C) remains the same.
Compared to the recoiling cannon, a fired cannonball has a
A) greater momentum.
B) greater kinetic energy.
C) smaller speed.
D) all of the above
A ball is thrown upwards and caught when it returns. Compared with its initial speed
and in the presence of air resistance, the speed with which it is caught is always
A) less.
B) the same.
C) more.
D) can't be determined.
Underlying the concept of self-induction is
A) Ohm's law.
B) Faraday's law.
C) Maxwell's law.
D) all of these about equally
Strange as it may seem, it is just as difficult to accelerate a car on a level surface on the
Moon as it is here on Earth because
A) the mass of the car is independent of gravity.
B) the weight of the car is independent of gravity.
C) both of these
D) neither of these
Who envisioned the motion of planets as projectiles obeying the laws of physics?
A) Kepler
B) Newton
C) both of these
D) neither of these
If all the uranium in the world were exhausted, breeder reactors would be
A) in greater demand.
B) relics of a brief age.
C) both of these
D) neither of these
Two pulses of light, one red and one blue, have the same energy. The pulse with the
greater number of photons is the
A) red pulse.
B) blue pulse.
C) both the same
A spaceship traveling very fast relative to you fires a stream of photons at speedc away
from you. You measure the photons' speed to be
A) less than c.
B) more than c.
C) equal to c.
Apart from the effects of other planets, the orbit of Mercury precesses because
A) Mercury travels faster than any other planet.
B) Mercury's orbit is nearly circular.
C) of pronounced variations in Mercury's orbit about the Sun.
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
Compared with the wavelengths of visible light, the wavelengths of matter waves in
atoms are relatively
A) long.
B) short.
C) neither, for all are the same.
The heat we enjoy on a sunny day is due mainly to the Sun's
A) high surface temperature.
B) relatively close distance.
C) enormous size.
D) none of the above
Compared to an empty ship, the same ship loaded with Styrofoam will float
A) higher in the water.
B) lower in the water.
C) at the same level in the water.
The energy of a photon is related to
A) the energy given to the atom that emits it.
B) the energy transition in de-excitation.
C) its frequency.
D) all of the above
E) none of the above
Light is emitted when an electron
A) is boosted to a higher energy level.
B) makes a transition to a lower energy level.
C) accelerates to a medium energy level.
D) none of the above
A projectile that is fired vertically from the surface of Earth at 5 km/s will
A) go into circular about Earth.
B) go into an elliptical orbit about Earth.
C) rise and fall back to Earth's surface.
D) none of the above
A pair of 10-N vectors at right angles to each other has a resultant of about
A) 10 N.
B) 14 N.
C) 20 N.
D) none of the above
A bird sitting on the limb of a tree is moving about 30 km/s with respect to the Sun. If
the bird takes 1 second to drop down to a worm below, the worm would be 30 km
downrange from the bird when it reached the ground. This faulty reasoning is best
countered with Newton's
A) law of inertia.
B) law of gravity.
C) laws of motion.
D) none of the above
Radio waves that diffract more around small buildings are
A) AM.
B) FM.
C) both diffract equally
Our eyes are not very good at seeing
A) motion at our peripheries.
B) differences in brightness.
C) color in dim light.
D) all of the above
E) none of the above
The normal force that acts on a block of ice that slides on a ramp
A) is equal to mg at all angles.
B) decreases as the slope of the ramp increases.
C) becomes greatest when the ramp is vertical.
An object heated to twice the absolute temperature emits radiation
A) with twice the peak frequency.
B) in the ultraviolet part of the spectrum.
C) in the radio wave part of the spectrum.
D) with longer wavelengths.
According to Newton, when the distance between two interacting objects doubles, the
gravitational force is
A) half.
B) one-quarter.
C) the same.
D) twice as much.
E) four times as much.
The resulting atomic number of an element that emits 1 alpha particle, 1 positron, and 3
beta particles is
A) decreased by 2.
B) decreased by 1.
C) unchanged.
D) increased by 1.
E) increased by 2.
When coal dust is spread on snow on a sunny day
A) more melting occurs.
B) less melting occurs.
C) no change in melting rate occurs.
Glass is transparent to wave frequencies that
A) match its natural frequencies.
B) are below its natural frequencies.
C) both of these
D) neither of these
The universal gravitational constant G was first measured
A) before Newton's time.
B) by Newton himself.
C) after Newton's time.
