Unit 2 test

Absolute zero corresponds to a temperature of

0 K and -273C (both)

If the frequency of a certain wave is 10 Hz, its period is

0.1 s

What is the approximate mass of a 1-square centimeter column of air that extends from sea level to the top of the atmosphere?

1 kg

A weight on the end of a spring bobs up and down one complete cycle every 2 s. its period is

1 s

The frequency of the second hand on a clock is

1/60 Hz

If you use 10 J of work to push a coulomb of charge into an electric field, its voltage with respect to its starting position is

10 V

What is buoyant face acting on a 10-ton ship floating in the ocean?

10 tons

About how high can water be theoretically lifted by a vacuum pump at sea level?

10.3 m

A wave having a frequency of 1000 Hz vibrates at

1000 cycles per second

The current through a 10 ohm resistor connected to a 120-V power supply is

12 A

A floating leaf oscillates up and down two complete cycles each second as a water wave passes by. What is the wave's frequency?

2 Hz

The electric power of a lamp that carries 2 A at 120 V is

240 W

A volume of helium gas has a temperature of 10C. The same gas twice as hot has a temperature of

293C

What would be the temperature of a mixture of 50 g of 20 C water and 50 g of 40 C water?

30 C

The temperature at the bottom of Lake Tahoe, high in the Sierra Mountains in California, at this moment is

4 C

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

6 joules

The temperature of water rises when 2 calories are added. It will rise the same when

8.38 J are added

The fundamental frequency of a violin string is 440 Hz. The frequency of its second harmonic is 880 Hz

880 Hz

Which statement is correct?

Current flows through a circuit

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

A standing wave occurs when

a wave reflects upon itself

An umbrella tends to move upwards on a windy day principally because

air pressure is reduced over the top

The loudness of a musical sound is a measure of the sound wave's

amplitude

The least amount of energy is required to produce forced vibration in an object

at its natural frequency

The vibrations of a transverse wave move in a direction

at right angles to the direction of wave travel

For light, a red shift indicates the light source moves

away from you

Which has the greater density, a lake full of water or a cup full of lake water>

both

Two lamps, one with a thick filament and one with a thin filament, are connected in parallel to a battery. The voltage is greatest across the lamp with the

both voltages are the same

Water pressure is greatest against the

bottom of a submerged object

When an object is partly or wholly immersed in a liquid it is buoyed up

by a force equal to the weight of liquid displaced

Electrons move in an electrical circuit

by interacting with an established electric field

A nutritionist in the United States measures the food energy in units of

calories

In an ac circuit, the electric field

changes magnitude and direction with time

The electrical force between charges is strongest when the charges are

close together

An ampere is a unit of electrical

current

As we become older, the frequency range of human hearing

decreases

If glass expanded more than mercury, then the column of mercury in a thermometer would rise when the temperature

decreases

For each degree a volume of air at 0°C is cooled, its pressure

decreases by 1/273

The pressure in a liquid depends on liquid

density and depth (both)

If a loaf of bread is compressed its,

density increase

When gas in a container is squeezed to half its volume and the temperature remains the same, the gas pressure

doubles

The natural frequency of an object depends on its

elasticity, size and shape (both)

Which force binds atoms together to form molecules?

electrical

In an electrically neutral atom the number of protons in the nucleus is equal to the number of

electrons that surround the nucleus

You can touch a 100,000-V Van de Graaff generator with little harm because although the voltage is high, the relatively small amount of charge means there is a relatively small amount of

energy

Consider a sample of water at 20 C. If the temperature is slightly, the water

expands

If the temperature of a sample of 0 C water slightly increases, the sample of water

expands

When you touch a piece of ice with your finger, energy flows

from your finger to the ice

Gas pressure inside an inflated stretched balloon is actually

greater than air pressure outside the balloon

If the same quantity of heat is added to both a 2-liter and a 4-liter container of water, the temperature change for water in the 4 liter will be

half that of the 2-liter container

The quality of a musical note has to do with its

harmonics

Heat is thermal energy that flows from

high energy to low energy

Which of the following contracts most when the temperature is slightly increased? Equal volumes of

ice water

Suppose you rapidly stir some raw eggs with an egg beater. The temperature of the eggs will

increase

Stretch a copper wire so that it is thinner and the resistance between its ends

increases

To say that an object is electrically polarized is to say

its charges have been rearranged

Hot sand cools off faster at night than plants and vegetation, which indicates that the pacific heat capacity for sand is

less than that for plants

Pumice is a volcanic rock that floats. Its density is

less than the density of water

When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is

less than the resistance of either lamp

Water at 4 C will sink to the bottom of a pond because

like a rock, it is denser than surrounding water

The air in this room has

mass, weight, and energy

Whether one object is warmer than another object has lost to do with

molecular kinetic energy

More disorder means

more entropy

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

more than 20 V

A metal ring with a gap in it is shaped like the letter C. When the hot metal cools, the gap becomes

narrower

To say that electric charge is conserved means that no case has ever been found where

net charge has been created or destroyed

The electric field around an isolated electron has a certain strength 1 cm from the electron. The electric field strength 2 cm from the electron is

none

The thermal energy in a substance is related mostly to the

none of the above

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

out of step

The buoyant force on an object is least when the object is

partly submerged

A sound source of high frequency emits a high

pitch

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

quadruples

Which doesn't belong to the same family?

radio shaves

Reverberation is actually a case of

re-echoed sound

A main difference between gravitational and electric forces is that electrical forces

repel or attract

Which law of thermodynamics addresses the direction of heat flow?

second law

In an electric circuit, the safety fuse is connected to the circuit in

series

Which will cool faster when taken from a furnace?

silver

Wave interference occurs for

sound waves, light waves, and water waves (all of the above)

The explanation for refraction must involve a change in

speed

Sound travels faster in

steel

To be safe in the unlikely case of a lightning strike, it is best to be inside a building framed with

steel

The reason a life jacket helps you float is that

the density of both you and the jacket is less than your density alone

In a longitudinal wave, the compressions and rarefaction travel in

the same direction

Two lamps, one with a thick filament and one with a thin filament, are connected in series. The current is greater in the lamp with the

the same in each lamp.

Two lamps, one with a thick filament and one with a thin filament, are connected in parallel to a battery. The current is greatest across the lamp with the

thick filament

Two lamps, one with a thick filament and one with a thin filament are connected in series to a battery. The voltage is greater across the lamp with the

thin filament

A doppler effect occurs when a source of sound moves

toward and away from you (both)

When a chocolate bar is cut in half its density is

unchanged

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

upward

The reason that buoyant force acts upward on a submerged object is that

upward pressure is greater than downward pressure

The source of all sounds is something that is

vibrating

The source of all wave motion is a

vibrating object

A completely submerged object always displaces its own

volume of fluid

The filling of a hot apple is hotter than the crust due to

water in the filling that better retains thermal energy

The doppler effect is characteristic of

water waves, sound waves, light waves (all of the above)

A rising balloon is buoyed up with a force equal to the

weight of air it displaces

Atmospheric pressure is caused by the

weight of the atmosphere

A woman experiences an electrical shock. The electrons making the shock come from the

woman's body