Two identical particles move toward each other, one twice as fast as the other. Just
before they collide, one has a kinetic energy of 25 J and the other 50 J. At this instant
their total kinetic energy is
A) 25 J.
B) 50 J.
C) 75 J.
D) none of the above
E) need more information
Three-dimensional viewing was popular in the past with slide projectors. If the slides
for left and right positions in the stereo projector are duplicates of each other
A) depth can be seen.
B) no depth can be seen.
C) only parallax can be seen.
Compared with special relativity, general relativity is more concerned with
A) acceleration.
B) gravitation.
C) spacetime geometry.
D) all of the above
E) none of the above
Plane waves incident upon a barrier that pass through a small opening
A) continue as plane waves.
B) fan out.
C) converge.
D) become polarized.
E) all of the above
Compared to the buoyant force of the atmosphere on a 1-kilogram iron block, the
buoyant force on a nearby 1-kilogram helium-filled balloon is
A) considerably less.
B) considerably more.
C) the same.
You wish to drill a hole through a horizontal I-beam supporting a bridge. To weaken the
beam the least drill the hole through the
A) upper flange.
B) lower flange.
C) web.
D) all the same
Inside an accelerating spaceship far from gravitational influences, a flashlight beam will
A) not bend.
B) curve as it would in a gravitational field equal to the acceleration of the spaceship.
C) follow a semi-circular path.
Both a transverse wave and a longitudinal wave have
A) amplitude.
B) frequency.
C) wavelength.
D) speed.
E) all of the above
A lump of energy associated with light is called a
A) quantum.
B) photon.
C) both of these
D) neither of these
When a solid melts, energy is
A) absorbed by the solid.
B) released by the solid.
C) both of these
D) neither of these
Toss a baseball bat into the air and it wobbles about its
A) geometrical center.
B) center of mass.
C) heavier end.
A hydraulic press has its input piston depressed 20 centimeters while the output piston
is raised 1 centimeter. A 1-newton input can lift a load of
A) 1 N.
B) 10 N.
C) 15 N.
D) 20 N.
E) none of the above
Iridescent colors in the pearly luster of an abalone shell are due to
A) refraction.
B) diffraction.
C) dispersion.
D) polarization.
E) interference.
Compared to sea level, water in an open pot in the mountains boils at
A) a higher temperature.
B) a lower temperature.
C) the same temperature.
D) none of the above
A hospital patient confined to bed will be less likely to develop bed sores with a
A) firm mattress.
B) soft mattress.
C) water bed.
D) none of these will help.
The operation of a cloud chamber relies on
A) magnetization.
B) evaporation.
C) acceleration.
D) polarization.
E) condensation.
To say there is no such thing as only one force means
A) there must also be a corresponding reaction force.
B) other forces, perhaps not evident, are there.
C) gibberish.
Carbon-14 is produced in the atmosphere principally by
A) plants and animals.
B) cosmic-ray bombardment.
C) nitrogen bombardment.
D) photosynthesis.
E) none of the above
Magnet A has twice the magnetic field strength of Magnet B and at a certain distance
pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on
magnet B is
A) at or about 50 N.
B) exactly 100 N.
C) need more information
A ball is tossed upward. Neglecting air drag, the acceleration along its path is
A) 0 g.
B) g downward.
C) g upward.
D) g upward, then g downward.
E) none of the above
For radio transmission, which has the higher frequency?
A) carrier wave
B) sound wave
C) neither of these
Padded dashboards in cars are safer in an accident than non-padded ones because
passengers hitting the dashboard encounter
A) lengthened time of contact.
B) shorter time of contact.
C) decreased impulse.
D) increased momentum.
A region of expanding air tends to
A) cool.
B) warm.
C) both of the these
D) neither of these
A suitable electric pump in an electric circuit is a
A) chemical battery.
B) generator.
C) both of these
D) neither of these
The kind of waves that travel fastest through a long metal rod have
A) short wavelengths.
B) waves of medium length.
C) long wavelengths.
D) all have the same speed
A heat pump can
A) cool an environment.
B) warm an environment.
C) both of these
D) neither of these
A clerk can lift cylindrical packages 1 meter vertically, or can roll them up a
2-meter-long ramp to the same elevation. With the ramp, the applied force required is
about
A) half as much.
B) the same.
C) twice as much.
D) four times as much.
To catch a fast-moving ball, you extend your hand forward before contact with the ball
and let it ride backward in the direction of the ball’s motion. Doing this reduces the
force of contact on your hand principally because the
A) force of contact is reduced.
B) relative velocity is less.
C) time of contact is increased.
D) time of contact is decreased.
E) none of the above
The speed of light in the void between molecules in glass is
A) more than its speed in a vacuum.
B) the same as its speed in a vacuum.
C) less than its speed in a vacuum.
A fish normally displaces its own
A) volume of water.
B) weight of water.
C) both of these
D) neither of these