Neon signs require about 12,000 volts to operate. If the circuit uses a 120-volt power
source, the ratio of primary to secondary turns on the transformer should be
A) 1 primary to 100 secondary.
B) 100 primary to 1 secondary.
C) neither of these
Which contains more atoms?
A) 1 kg of hydrogen
B) 1 kg of iron
C) both contain the same
Electrons flow in a wire when there is
A) an imbalance of charges in the wire.
B) a potential difference across its ends.
C) a difference in potential energy across its ends.
D) none 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.
The most harmful radiations are those that
A) kill living cells.
B) damage living cells.
C) don’t encounter cells.
A good heat conductor is
A) a poor insulator.
B) a good insulator.
C) neither of these
The white-hot sparks from a 4th-of-July-type sparkler that strike your skin transfer
A) little energy to you in spite of their high temperature.
B) little energy to you due to their low temperature.
C) much energy, but at a low temperature.
D) none of the above
Ideally, a ball is thrown up at an angle and lands downrange. Because of air resistance,
the distance reached is
A) less.
B) the same.
C) greater.
D) need more information
Figure G-3
A satellite follows an elliptical orbit about a planet as shown. The speed of the satellite
is greatest when the satellite is in position
1) A.
2) B.
3) C.
4) D.
5) same at all points in its orbit.
At which position is there no component of force in the direction of the satellite’s
instantaneous velocity?
6) A
7) B
8) C
9) D
10)A component of force exists in the direction of instantaneous velocity at every point
along the orbital path.
The air in this room has
A) mass.
B) weight.
C) energy.
D) all of the above
E) none of the above
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.
If more horizontal force is applied to a sliding object than is needed to maintain a
constant velocity, the object
A) accelerates in the direction of the applied force.
B) accelerates opposite the direction of the applied force.
C) experiences greater friction.
D) none of the above
Isolated bells ring clearly, while bells crammed in a box have a muffled ring. This is
analogous to light emitted by
A) a laser.
B) a fluorescent lamp.
C) an incandescent lamp.
D) a phosphorescent source.
E) none of the above
An important condition for operation of the Falkirk Wheel is that
A) water in each gondola have the same depth.
B) ships carried are more or less equal in weight.
C) no water spill when a ship enters a gondola.
D) all of the above
E) none of the above
The energy of a photon depends on its
A) speed.
B) frequency.
C) amplitude.
D) all of the above
E) none of the above
Most of the waves in the electromagnetic spectrum are
A) red light.
B) blue light.
C) green light.
D) invisible.
If the mass of Earth somehow increased with no change in radius, your weight would
A) increase also.
B) decrease.
C) stay the same.
A ball rolls along a horizontal track in a certain time. If the track has a small upward
dent in it, the time to roll the length of the track will be
A) less.
B) the same.
C) more.
Compared with the buoyant force of the atmosphere on a 1-liter helium-filled balloon,
the buoyant force of the atmosphere on a nearby 1-liter solid iron block is
A) considerably less.
B) considerably more.
C) the same.
A ball is thrown upwards and returns to the same location. Compared with its initial
speed its speed when it returns is about
A) half as much.
B) the same.
C) twice as much.
D) four times as much.
Neglecting friction, a ball rolling along a horizontal plane will
1) accelerate indefinitely.
2) roll until the force used to roll it was used up.
3) roll indefinitely at a constant speed.
This illustrates
4) the basic principle that a body requires a push or pull to keep it moving.
5) inertia.
6) the law of net force.
A coconut and a bird’s feather fall from a tree through the air to the ground below. The
force of air resistance is
A) greater on the coconut.
B) greater on the feather.
C) the same on each.
If a block is set sliding on a huge imaginary frictionless plane in contact with Earth’s
surface, it will NOT sustain a constant speed because
A) a component of gravitational force parallel to the plane soon acts on it.
B) gravity gets weaker as distance increases.
C) it is not free from the shackles of Earth’s gravity.
D) of its inertia.
According to de Broglie, constructive interference occurs when an orbiting wave
A) reinforces itself
B) doesn’t reinforce itself.
C) neither of these
During snow fall, the surrounding air is
A) cooled.
B) warmed.
C) both of these
D) neither of these
Light emitted by the Sun is
A) polarized.
B) nonpolarized.
C) sometimes polarized.
Two factors that greatly affect air resistance on falling objects are frontal area and
A) mass.
B) weight.
C) speed.
The emphasis of the orange-and-apple sequence in your textbook is
A) defining systems.
B) actions equal reactions.
C) forces produce accelerations.
D) friction is a force.
E) mass is not a force.
Consider the interference colors in a film of gasoline on a wet street. The water
provides a
A) means of spreading the gasoline into a thin film.
B) means of slowing the rapid evaporation of gasoline.
C) chemical bond with the gasoline.
D) second reflecting surface.
E) all of the above
When a hot object makes thermal contact with a cold object, the direction of
A) temperature is from hot to cold.
B) internal energy flow is from hot to cold
C) both of these
D) neither of these