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When we apply the Lorentz factor γ to length contraction, we
A) multiply by γ as in the equation for time dilation.
B) multiply by the reciprocal of γ
C) find it does not apply.
Which temperature scale has the smallest sized degrees?
A) Fahrenheit
B) Celsius
C) Kelvin
D) none of the above
Magnification by a lens would be greater if light
A) propagated instantaneously.
B) traveled faster in glass than it does.
C) traveled slower in glass than it does.
D) beams spread less.
E) none of the above
If 10 J of work is used in pushing 1 C of charge into an electric field, its electric
potential relative to its starting position is
A) less than 10 V.
B) 10 V.
C) more then 10 V.
D) none of the above
The amount of heat needed to raise the temperature of 1 gram of water by 1oC is
A) 4.19 calories.
B) 4.19 Calories.
C) 4.19 joules.
D) none of the above
You can get a sunburn while under the "shade" of a beach umbrella due to
A) reflected sunlight from the sand.
B) refracted sunlight from the water.
C) light scattering in the air.
D) none of the above
Jason weighs 150 N and sits on his big brother's shoulders. Big brother weighs 400 N.
The support force supplied by the floor must be
A) 150 N.
B) 400 N.
C) 550 N.
D) more than 550 N.
In one word, how can water in the power plant of a nuclear submarine far exceed
100oC?
A) conductivity
B) evaporation
C) condensation
D) pressure
E) vaporization
You shine a beam of monochromatic light from Earth to an astronaut friend in orbit.
The light your friend receives, relative to light from an equivalent source on the
spaceship, is slightly
A) lower in frequency.
B) higher in frequency.
C) weaker but no different in frequency.
Refraction of sound can occur in
A) air.
B) water.
C) both of these
D) neither of these
Burl and Paul paint signs together on a scaffold. Compared to their weights plus the
weight of the scaffold, the sum of tensions in the supporting ropes is
A) less.
B) the same.
C) greater.
D) zero.
As a huge rotating cloud of particles in space gravitate together forming an increasingly
dense ball, it shrinks in size and
A) rotates slower.
B) rotates at the same speed.
C) rotates faster.
D) cannot rotate.
A solid glass ball weighs 1 N. One with twice the diameter weighs
A) 1 N.
B) 2 N.
C) 3 N.
D) 4 N.
E) more than 4 N.
If Alex wishes to rotate his skateboard, then he must apply a
A) torque.
B) rotational maneuver.
C) pause before bearing down on the board.
To study the energy of photoelectrons we measure
A) the potential difference required to stop them.
B) the distance traveled in a given time.
C) the time taken to travel a given distance.
D) their temperature.
Compared to noise, musical sounds have
A) periodic tones.
B) musical notes.
C) both of these
D) neither of these
What is the frequency of an electromagnetic wave that has a wavelength of 300,000
km?
A) less than 1 Hz
B) 1 Hz
C) more than 1 Hz
As a blinking light source uniformly accelerates away from you, you observe the blinks
A) more and more frequently.
B) less and less frequently.
C) neither of these
When you jump from an elevated position you usually bend your knees upon reaching
the ground, which makes the time of the contact about 10 times that of a stiff-legged
landing. In this way the average force your body experiences is
A) less than 1/10 as great.
B) more than 1/10 as great.
C) about 1/10 as great.
D) about 10 times as great.
When wind encounters a wind turbine that produces energy, wind speed on the
downside of the blades is
A) slowed.
B) speeded up.
C) not affected.
A firecracker bursts while freely falling. The combined momentum of its fragments
A) equals the momentum of the firecracker at the time of burst
B) cancels to the firecracker's momentum at the time of bursting.
C) cancels to zero.
D) none of the above
The spectral lines are more distinct when viewed in a mercury vapor lamp under
A) high pressure.
B) low pressure.
C) same for each
A force of 1 N accelerates 1-kg box at the rate of 1 m/s2. The acceleration of a 2-kg box
by a net force of 2 N is
A) half as much.
B) twice as much.
C) the same.
D) none of the above
A 2-kg rifle that is suspended by strings fires a 0.01-kg bullet at 200 m/s. The recoil
velocity of the rifle is about
A) 0.001 m/s.
B) 0.01 m/s.
C) 0.1 m/s.
D) 1 m/s.
E) none of these
Which is heated in its interior by nuclear processes?
A) Sun
B) Earth
C) both of these
D) neither of these
If you bake cupcakes as directed for a cake, the cupcakes will be
A) over-baked.
B) under-baked.
C) properly baked.
Different colors of light correspond to different light
A) velocities.
B) intensities.
C) polarities.
D) frequencies.
E) none of the above
As a parcel of air at high altitude sinks to a lower elevation with no heat input or output,
its temperature
A) increases.
B) decreases.
C) will remain unchanged.
An object that completes 10 vibrations in 20 seconds has a frequency of
A) 0.5 hertz.
B) 2 hertz.
C) 200 hertz.
A scale from which a rock is suspended reads 5 N when the rock is out of water and 3 N
when the rock is submerged. The density of the rock is
A) the density of water.
B) 1.5 times the density of water.
C) 2.5 times the density of water.
D) 3.5 times the density of water.
E) none of the above
When a constant and sustained upward force acts on a rocket, its acceleration increases
mainly because
A) gravity becomes weaker with increased distance.
B) the mass of the rocket decreases as fuel is burned.
C) No way, for acceleration would be constant.
If a Ping-Pong ball and a golf ball both move in the same direction with the same
amount of kinetic energy, the speed of the Ping-Pong ball must be
A) less than the golf ball.
B) more than the golf ball.
C) both the same
D) need more information
