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Distant bright snowy mountains appear yellowish because
A) they are far away.
B) blue has been scattered away from light reflected from the mountains.
C) the color yellow looks just right.
D) of nature's wonderful preferences.
Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air
resistance, one second later the rock's speed is
A) zero.
B) 5 m/s.
C) 10 m/s.
D) 15 m/s.
E) none of the above
An annular eclipse of the Sun occurs when the Moon doesn't quite cover the Sun in the
zone of totality. This means that the Moon is
A) closer than usual to Earth.
B) farther than usual from Earth.
C) none of these
A hockey puck sliding at constant velocity across the ice is
A) in equilibrium.
B) nearly in equilibrium.
C) is nowhere near being in equilibrium.
D) none of the above
When Niels Bohr was knighted for his contributions to physics, he chose for his coat of
arms
A) a model of the planetary atom.
B) a rendition of an energy-level diagram.
C) the yin-yang symbol of Eastern culture.
D) none of the above
Matter in the plasma state is commonly found in
1) dry ice.
2) molten lava.
3) the flame of a high-temperature welding torch.
Compared to solids, liquids, and gases in the universe, plasma is the most
4) abundant.
5) rare.
6) there is no valid estimate at this time.
The amount of energy converted to light by an incandescent light bulb is about
A) 10% and the amount converted to heat about 90%
B) 90% and the amount converted to heat about 10%.
C) either of these depending on the brand.
The power expended doing 100 J of work in 50 s is
A) 1/2 W.
B) 2 W.
C) 4 W.
D) 50 W.
E) 5,000 W.
Green light emitted by excited mercury vapor corresponds to an energy transition in the
mercury atom. A more energetic transition might emit
A) red light.
B) blue light.
C) white light.
D) any of these
A spinning tossed baseball veers off course in the direction of
A) reduced air pressure on the ball.
B) increased air pressure on the ball.
C) non-crowded streamlines.
Archimedes' principle applies to
A) liquids.
B) gases.
C) fluids.
D) all of the above
The voltage across the input terminals of a transformer is 120 V. The primary has 50
loops and the secondary has 25 loops. The voltage the transformer delivers is
A) 30 V.
B) 60 V.
C) 120 V.
D) 240 V.
E) none of the above
A positively-charged rod is held near an aluminum can that rests on a dry wood table. If
you momentarily touch the opposite side of the can with your finger, the can becomes
A) positively charged.
B) negatively charged.
C) partially discharged.
D) completely discharged.
E) none of the above
Isaac Newton first became famous for his contributions to the understanding of
A) the laws of mechanics.
B) the law of gravity.
C) light.
If you look at yourself in a pocket mirror, then hold the mirror farther away, you see
A) more of yourself.
B) less of yourself.
C) the same amount of yourself.
If you do work on a skateboard loaded with friends in one-third the usual time, you
expend
A) one third as much power.
B) the usual power.
C) three times the usual power.
D) need more information.
Objects moving at relativistic speeds appear to observers at rest to be
A) stretched.
B) shrunken.
C) either depending on direction of motion.
D) none of the above
Sound waves cannot travel in
A) air.
B) water.
C) steel.
D) a vacuum.
If a fish in a pond looks upward at 50o to the normal, it will see
A) the pond's bottom.
B) the sky and possibly some tall surroundings.
C) only the water's surface.
D) none of the above
A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting
air resistance, how far downrange will the bullet be 1 second later?
A) 50 m
B) 98 m
C) 100 m
D) 490 m
E) none of the above
The principle difference between a step-up and step-down transformer is
A) step-up transformers can handle more current.
B) different geometries.
C) different ratios of turns of wire for each.
D) none of the above
When scrap iron in a boat is thrown overboard in a swimming pool, the pool level
A) rises.
B) falls.
C) remains unchanged.
An 80-km/h airplane caught in a 60-km/h crosswind has a resultant speed of
A) 60 km/h.
B) 80 km/h.
C) 100 km/h.
D) 141 km/h.
The power dissipated in a 4-ohm resistor carrying 3 A is
A) 7 W.
B) 18 W.
C) 36 W.
D) 48 W.
E) need more information
If the Moon were four times as massive but twice as far from Earth, high tides on Earth
would be
A) higher.
B) lower.
C) no different.
The newton is a unit of
A) force.
B) mass.
C) density.
D) inertia.
A car by itself is capable of a certain maximum acceleration. When it tows a
twice-as-massive car, its maximum acceleration is
A) one half.
B) one third.
C) one fourth.
D) the same.
E) none of these
When we apply the Lorentz factor γ to momentum, we
A) multiply by γ as with the equation for time dilation.
B) multiply by the reciprocal of γ.
C) find it does not apply.
Most of the matter in the universe is in the
A) solid phase.
B) liquid phase.
C) gaseous phase.
D) plasma phase.
E) none of the above
The Early Bird communication satellite hovers over the same point on Earth's equator
indefinitely, because
A) other forces than Earth's gravity act on it.
B) it pulls as hard on Earth as Earth pulls on it.
C) it is beyond the main pull of Earth gravity.
D) it is kept aloft by ground control.
E) its orbital period is 24 hours.
Repeatedly tap the side of a drinking glass with a spoon as you fill the glass with water
and the pitch of the sound
A) increases.
B) decreases.
C) remains relatively constant.
A transformer transforms voltage while
A) producing energy.
B) producing power.
C) transferring energy from one coil to another.
D) transferring current from one coil to another.
