Physic final

Increased air pressure on the surface of hot water tends to

prevent boiling

The first law of thermodynamics is a restatement of the

principles of conservation

When the distance between two charges is halved, the electrical force between the charges

quadrupled

The planet Earth loses heat mainly by

radiation

We are best at hearing

We cannot hear ultrasonic or infrasonic sound. None of the choices are true

The electric field inside an uncharged metal ball is zero. If the ball is negatively charged, the electric field inside the ball is then

Zero

In the mountains, water in an open pot boils at

a lower temperature than at sea level

Electrons are made to flow in a wire when there is

a potential difference across its ends

The unit of electric charge, the coulomb, is the charge on

a specific large number of electrons.

Superconductors are noted for their

absence of electric resistance

Objects that radiate relatively well,

absorb radiation relatively well

The pupil of your eye is a net

absorber of radiant energy

When a solid is changed to a liquid state, the solid

absorbs energy

Cold water will warm to room temperature faster in a

black tea pot.

A balloon will stick to a wooden wall if the balloon is charged

either

A circuit breaker serves the same purpose as

fuse

A neon atom has a larger atomic number than a helium atom. At the same temperature and pressure, how does the speed of sound in helium gas compare to the speed of sound in neon gas?

greater in helium than in neon

If you double the frequency of a vibrating object, its period

half

Electromagnetic waves consist of

oscillating electric and magnetic fields.

to say that one wave is out of phase with another is to say that the waves are

out of step

The force on an electron moving in a magnetic field will be the largest when its direction is

perpendicular to the magnetic field direction.

When heat is added to boiling water, its temperature

stays the same

An aircraft that flies faster than the speed of sound is said to be

supersonic

Which involves the larger number of calories?

the condensation of 1 gram of steam at 100 degrees Celsius to 100 degrees Celsius water

Evaporation is a cooling process because

the more energetic molecules are able to escape the liquid

An iron rod becomes magnetic when

the net spins of its electrons are in the same direction

When the speed of sound near the ground is greater than higher in the air, sound tends to be bent

upward

Which would burn the most: 100g of water at 100 degrees C, 100g of steam at 100 degrees C, or both?

100 degrees of steam

The amount of energy ultimately converted to heat by a light bulb is about

100%

A tuning fork of frequency 200 hertz will resonate if a sound wave incident on it has a frequency

100Hz

A floating leaf oscillates up and down two complete cycles in one second as a water wave passes by. The wave's wavelength is 10 meters. What is the wave's speed?

10m/s

A power line with a resistance of 2 ohms has a current of 80 A in it. The power dissipated in the line is

12,800

Two identical blocks of iron, one at 10 degrees C and the other at 20 degrees C, are put in contact. Suppose the cooler block cools to 5 degrees C and the warmer block warms to 25 degrees C. This would violate the

2nd law

Two tuning forks produce sounds of wavelengths 3.4 meters and 3.3 meters. Approximately what beat frequency is produced?

3 Hz

A skipper on a boat notices wave crests passing the anchor chain every 5 seconds. The skipper estimates the distance between crests is 15 m. What is the speed of the water waves?

3 m/s

A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is

30 hertz and it travels at 60 m/s.

An electric heater is rated at 300 W when used in a 110-V circuit. The safety fuse in the circuit can handle 15 A of current. How many heaters can be safely operated in the circuit?

5

A 10-ohm resistor has a 5-A current in it. What is the voltage across the resistor?

50 V

A coulomb of charge that passes through a 6-volt battery is given

6 j

The ideal efficiency for a heat engine operating between temperatures of 2700 K and 300 K is

89%

The technology for orbiting solar power plants

Already exists

To say that electric charge is conserved is to say that electric charge

Can neither be created nor destroyed

Two protons attract each other gravitationally and repel each other electrically. By far the greater is

Electrical repulsion

A proton and an electron are placed in an electric field. Which undergoes the greater acceleration?

Electron

Food in a pressure cooker is cooked faster because of the

Higher temp

To say that electric charge is quantized is to say that the charge on an object

Is a whole-Number multiple of the charge of one electron

Which pole of a compass needle points to a south pole of a magnet?

North

The direction of an electric field is the direction of the force that it would exert on

Proton

Caruso is said to have made a crystal chandelier shatter with his voice. This is a demonstration of

Resonance

When you tune a radio to a certain station, you match the frequency of the internal electrical circuit to the frequency of the wanted radio station. In so doing you are employing the principle of

Resonance

An important factor in the process of regelation is

all

Adiabatic processes occur in the

all of above

A heat engine would have 100 percent efficiency if its input reservoir were

any finite temperature if the exhaust sink were at absolute zero.

A wave barrier is produced when a wave source moves

as fast as the waves it produces.

If a steady magnetic field exerts a force on a moving charge, that force is directed

at right angles to the direction of the field.

Like kinds of magnetic poles repel while unlike kinds of magnetic poles

attract

An uncharged pith ball is suspended by a nylon fiber. When a negatively charged rubber rod is brought nearby, without touching it, the pith ball

becomes polarized.

Both black and white road surfaces absorb sunlight. At the end of a sunny day the warmer road surface will be

black

You can briefly touch a hot clothes iron with your bare finger if it is wet because the wetness

both of these

We feel uncomfortably warm on a muggy day because water molecules are

condensing on our bodies.

Heating the Earth's atmosphere is caused by energy

consumption, production

Ice is put in a cooler in order to cool the contents. In order to speed up the cooling process, the

crushed

As more lamps are put into a series circuit, the overall current in the power source

decrease

Sue's refrigerator is built into the wall of her kitchen, so that it exhausts heat to the outdoors rather than into the room. If Sue tries to cool her kitchen by leaving the refrigerator door open, the room temperature will

decrease a little

As we become older, the frequency range of human hearing

decreases.

To turn ice at zero degrees Celsius to water at zero degrees Celsius, we must add

energy

It is possible to wholly convert a given amount of heat energy into mechanical energy.

false

Inhaling helium increases the pitch of your voice. The reason for this is that sound travels

faster in helium than in air.

Firefighters find that the temperature of burning material is best lowered when water is

fine mist

The sonic boom at ground level produced by an aircraft will be reduced if the aircraft

flies higher

An object will normally be a net radiator of energy when its temperature is

higher than its surroundings

A positive charge and a negative charge held near each other are released. As they move, the force on each particle

increase

When a volume of air is compressed and no heat enters or leaves, the air temperature will

increase

If at a concert, a wind blows directly from the orchestra toward you, the speed of the sound you hear will be

increased

The energy of sound in air eventually becomes

increased internal energy of the air

If at a concert you run toward the orchestra, the frequency of the sound you hear will be

increased.

As more lamps are put into a parallel circuit, the overall current in the power source

increases

Morning dew on the grass is a result of

slow-moving water molecules sticking to one another.

Compared to a single lamp connected to a battery, two identical lamps connected in series to the same battery will carry

less current

When a light switch is turned on in a dc circuit, the average speed of electrons in the lamp is

less than 1 cm/s.

When bringing water to a boil in the mountains, the time needed to reach the boiling point is

less than at sea level.

Double the absolute temperature of helium gas and the average speed of its molecules

less than doubles

Charge carriers in a metal are electrons rather than protons, because electrons are ______.

loosely bound

A wire that carries an electric current

may be electrically charged

Connect a pair of lamps in series and you draw current from the connected battery. Connect the same lamps in parallel and you draw

more

To turn 50 grams of boiling water to steam requires

more calories than are required to bring 50 grams of ice at absolute zero to the boiling point.

An explosion occurs 34 km away. Since sound travels at 340 m/s, the time it takes for the sound to reach you is

more than 20s

Double the frequency of sound and you also double its

none of these

A possible cause for the existence of the Earth's magnetic field is

none of these.

Suppose you want to save energy and you're going to leave your cool house for a half hour on a hot day. You should turn the temperature setting on the air conditioner

off all together

Compared to the amount of electric current in the filament of a lamp, the amount of current in the connecting wire is

the same

Two charged particles held near each other are released. As they move, the acceleration of each decreases. Therefore, the particles have

the same sign.

On a humid day, water condenses on the outside of a glass of ice water. This phenomenon occurs mainly because of

the saturation of cooled air

Boiling water does not increase in temperature when additional heat is applied because

the temperature doesn't change in a change of state.

A circuit is powered with a battery. Charge flows

through both the battery and the rest of the circuit.

Sound travels faster in air if the air is

warm

Chinook winds tend to

warm an environment

When water vapor condenses on the inside of a window, the room becomes slightly

warmer

To say that evaporation is a cooling process is to say that the

water left behind cools.

Double the frequency of a sound and you halve its

wavelength