Ch 16 Heat Transfer

The solar constant for Earth is a. 1.0 kW/m^2 b. more than 1.4 kW/m^2 c. 1.4 kW/m^2 d. 0.7 kW/m^2

1.4 kW/m^2

The amount of solar energy per square meter atop the atmosphere at right angles to the Sun's rays is about a. 1400 joules b. much more than 1400 joules c. 1000 joules d. 700 joules

1400 joules

Long ago a runaway greenhouse effect transformed the planet a. Mars b. Mercury c. Venus d. all of the above

Venus

If there were no greenhouse effect, Earth's average temperature would likely be a. near absolute zero b. a frigid -18 degrees C c. warmer than now d. comfortably cooler

a frigid -18 degrees C

The temperature of outer space is a. zero b. meaningless c. about 2.7 Kelvin d. none of the above

about 2.7 Kelvin

Objects that radiate relatively well a. reflect radiation relatively well b. absorb radiation relatively well c. both of these d. neither of these

absorb radiation relatively well

The pupil of your eye is a net a. reflector of radiator energy b. emitter of radiant energy c. absorber of radiant energy d. none of above

absorber of radiant energy

A bare roof on a warmly heated home on a snowy day indicates a. fairly good conductivity b. poor insulation c. an unwanted flow of heat d. all of the above

all of the above

Substances absorb heat energy by the process of a. radiation b. conduction c. convection d. all of the above

all of the above

Which of these are good insulators? a. wood b. snow c. feathers d. all the above e. none of the above

all the above

Glass in a florist's greenhouse acts as a one-way valve in that it a. cuts off unwanted radiation b. is transparent only to lower-frequency waves c. lets light energy flow only in one direction d. allows high-frequency waves in and blocks low-frequency waves exiting

allows high-frequency waves in and blocks low-frequency waves exiting

If no molecular collisions occurred in a sample of gas, temperature of the gas would a. increase b. be unaffected c. decrease

be unaffected

A liter of cold water will warm faster in sunlight in a a. red pot b. black pot c. silver pot d. none of the above

black pot

A liter of cold water will warm faster in sunlight in a a. red pot b. black pot c. silver pot d. none of the above

black pot

Blow on your hand with your mouth open. Then do the same with your lips puckered and you'll find a. the breath from puckered lips a. the breath from puckered lips is cooler b. a difference in temperature c. both of these d. neither of these

both of these

Newton's law of cooling applies to objects undergoing a. warming b. cooling c. both of these d. neither of these

both of these

Solar power is used in many parts of the world for a. heating water b. generating electricity c. both of these d. neither of these

both of these

Steam that issues from a pressure cooker a. cools as it expands b. is invisible c. both of these d. neither of these

both of these

A parcel of warmed air rises due to a. increased energy of its molecules b. buoyancy c. random molecular motion d. radiation

buoyancy

In terms of transferring heat, red-hot wooden coals a. conduct poorly b. convect poorly c. radiate poorly d. conduct quite well

conduct poorly

If air were a better conductor, at nighttime Earth would be a. considerably colder b. not appreciably different in temperature c. considerably warmer

considerably colder

Soaring birds and glider pilots can remain aloft for hours without expending power, due to a. convection b. conduction c. radiation d. all of the above

convection

If a volume of air is warmed, it expands and tends to a. cool b. warm c. neither of these

cool

If a volume of air is warmed, it expands and tends to a. cool b. warm c. neither of these

cool

If the composition of the upper atmosphere were altered to permit a greater amount of terrestrial radiation to escape, Earth would be a. warmer b. quite unaffected c. cooler d. none of the above

cooler

If a pizza radiates more energy than it absorbs, its temperature a. decreases b. increases c. is unaffected d. none of the above

decreases

To save energy while you leave your warm house for a half hour on a cold day, turn the thermostat a. to room temperature b. down c. up

down

The heat we enjoy on a sunny day is due mainly to the Sun's a. enormous size b. high surface temperature c. relatively close distance d. none of the above

enormous size

Energy transfer by convection is primarily restricted to a. gases b. liquids c. fluids d. solids e. none of the above

fluids

A good absorber of radiation is a a. poor emitter of radiation b. good reflector c. good emitter of radiation d. none of the above

good emitter of radiation

An apple pie will be a net emitter of energy when its temperature is a. higher than its surroundings b. lower than its surroundings c. none of these

higher than its surroundings

In a mixture of hydrogen gas, oxygen gas, and nitrogen gas, the molecules with the greatest average speed are those of a. hydrogen b. nitrogen c. oxygen d. all the same

hydrogen

If you were caught in freezing weather with only a candle for heat, you would be warmer in a. tent b. car c. wooden house d. igloo

igloo

If a pizza absorbs more energy than it emits, its temperature a. is unaffected b. decreases c. increases d. none of the above

increases

When a volume of air is compressed, air temperature a. increases b. decreases c. neither of these

increases

When a hot object makes thermal contact with a cold object, the direction of a. internal energy flow is from hot to cold b. temperature is from hot to cold c. both of these d. neither of these

internal energy flow is from hot to cold

On a cold day your feet feel warmer on a rug than on a tile floor because a rug a. for the same mass has more internal energy than tile b. is a poorer conductor c. is usually warmer than tile d. all of the above e. none of the above

is a poorer conductor

On a cold day your feet feel warmer on a rug than on a tile floor because a rug a. for the same mass has more internal energy than tile b. is a poorer conductor c. is usually warmer than tile d. all of the above e. none of the above

is a poorer conductor

When an object absorbs as much as it radiates a. it remains at about the same temperature b. it is a net radiator c. it is a net absorber d. none of the above

it remains at about the same temperature

Hydrogen and oxygen molecules in a sample of gas have the same temperature. This means the hydrogen molecules, on average, have the same a. speed, but more kinetic energy b. speed and the same kinetic energy c. kinetic energy, but more speed d. kinetic energy, but more speed e. speed, but less kinetic energy

kinetic energy, but MORE speed

If a poor absorber of radiation were a good emitter, its temperature would be a. same as it surroundings b. less than its surroundings c. more than its surroundings

less than its surroundings

A blueberry pie will be a net absorber of energy when its temperature is a. higher than its surroundings b. lower than its surroundings c. none of these

lower than its surrounding

When coal dust is spread on snow on a sunny day a. no change in melting rate occurs b. less melting occurs c. more melting occurs

more melting occurs

Which of these are good conductors? a. wood b. feathers c. snow d. all the above e. none of the above

none of the above

To save energy while you leave your cool house for a half hour on a hot day, turn the temperature setting on the air conditioner a. to room temperature b. down c. up d. off altogether

off altogether

A good reflector of radiation is a a. good emitter of radiation b. poor absorber of radiation c. good absorber of radiation d. none of the above

poor absorber of radiation

A good heat conductor is a. a poor insulator. b. a good insulator. c. neither a poor nor a good insulator.

poor insulator

The form of heat transfer that doesn't depend on a medium is a. conduction b. radiation c. convection d. all of the above

radiation

Molecules in a region of expanding air more often collide with neighboring molecules that are a. approaching b. nearly out of range c. receding

receding

When you're ready for eh hottest sips of coffee, add cream a. when you are ready to drink the coffee b. right away c. at any time

right away

The higher the temperature of an object, the a. shorter the wavelengths it radiates b. makes no difference in the wavelengths it radiates c. longer the wavelengths it radiates

shorter the wavelengths

Solar power is the rate at which a. the atmosphere absorbs energy b. the Sun emits energy c. solar energy is received from the Sun d. all of the above e. none of the above

solar energy is received from the Sun

Sun's radiant energy is composed of shorter wavelengths than Earth's due to Sun's greater a. surface temperature b. size c. both of these d. neither of these

surface temperature

Heat normally flows from objects of high a. internal energy to objects of low internal energy b. temperature to objects of low temperature c. both of these d. neither of these

temperature to objects of low temperature

A water-filled paper cup held in a flame will not catch fire. This is because a. paper is a poor conductor of heat b. water is an excellent conductor c. the inside of the paper is wet d. the paper cup cannot become appreciably hotter than the water it contains

the paper cup cannot become appreciably hotter than the water it contains

Waves emitted by the Sun and terrestrial wave emissions are a. entirely different kinds of waves b. identical c. the same except for their frequencies and wavelengths

the same except for their frequencies and wavelengths

At the same temperature, which has greater average speed in the air? a. very light molecules b. heavier molecules c. both have equal average speeds

very light molecules

Which is the most abundant greenhouse gas in Earth's atmosphere? a. water vapor b. nitrogen c. carbon dioxide d. none of the above

water vapor

Both black and white road surfaces radiate energy. If both roads start the night at the same temperature, at the end of a starry night the cooler road surface will be A) the black surface. B) the white surface. C) Neither - there is no difference.

white

A block of wood and a block of copper will feel neither hot nor cold to the touch when they each have a. your temperature b. equal temperatures c. equal conductivities d. none of the above

your temperature