Chapter 16 physics test
When you're ready for the hottest sips of coffee, add cream
right away
Long ago a runaway greenhouse effect transformed the planet
Venus
Blow on your hand with your mouth open. Then do the same with your lips puckered and you'll find
both of these
Newton's law of cooling applies to objects undergoing
both of these
Solar power is used in many parts of the world for
both of these
Steam that issues from a pressure cooker
both of these
The lower the temperature of an object, the
both of these
A parcel of warmed air rises due to
buoyancy
A red-hot piece of coal will cool quicker in a
cold room
If air were a better conductor, at nighttime Earth would be
considerably colder.
Soaring birds and glider pilots can remain aloft for hours without expending power, due to
convection
You can safely hold your fingers on both sides of a candle flame due mainly to
convection
If a volume of air is warmed, it expands and tends to
cool
If the composition of the upper atmosphere were altered to permit a greater amount of terrestrial radiation to escape, Earth would be
cooler
If a pizza radiates more energy than it absorbs, its temperature
decreases
To save energy while you leave your warm house for a half hour on a cold day, turn the thermostat
down
Terrestrial radiation is
emitted by Earth
The solar constant is the
input of solar energy per square meter atop Earth's atmosphere.
Metals are good conductors of both heat and electricity due to
looseness of outer electrons in metal atoms.
A blueberry pie will be a net absorber of energy when its temperature is
lower than its surroundings
The solar constant for Earth is
1.4 kW/m2
The amount of solar energy per square meter atop the atmosphere at right angles to the Sun's rays is about
1400 joules
If there were no greenhouse effect, Earth's average temperature would likely be
a frigid -18°C
A good heat conductor is
a poor insulator
The temperature of outer space is
about 2.7 kelvin
Objects that radiate relatively well
absorb radiation relatively well
The pupil of your eye is a net
absorber of radiant energy
A bare roof on a warmly heated home on a snowy day indicates
all of the above
Every equation in physics reminds us of a lesson: we can never change only one thing. When we change the composition of the atmosphere we likely also change
all of the above
Substances absorb heat energy by the process of
all of the above
Which body glows with electromagnetic waves
all of the above
Wood is a poor conductor
all of the above
Which of these are good insulators?
all the above
Glass in a florist's greenhouse acts as a one-way valve in that it
allows high-frequency waves in and blocks low-frequency waves exiting
If you were caught in freezing weather with only a candle for heat, you would be warmer in
an igloo.
If no molecular collisions occurred in a sample of gas, temperature of the gas would
be unaffected
A liter of cold water will warm faster in sunlight in a
black pot
A liter of hot water will cool to room temperature faster in a
black pot
Both black and white road surfaces absorb sunlight. The warmer road surface at the end of a sunny day is the
black surface
Because of trapped air inside, snow is a
both a good insulator and a poor conductor.
In terms of transferring heat, red-hot wooden coals
conduct poorly.
A region of expanding air tends to
cool.
The heat we enjoy on a sunny day is due mainly to the Sun's
enormous size
If you release a single molecule in an evacuated region it will initially
fall just as a baseball would
Energy transfer by convection is primarily restricted to
fluids
A good absorber of radiation is a
good emitter of radiation
A bridge is more likely to be ice covered than the roadway on a cold day because
heat upwelling from the ground below is absent on a bridge
An apple pie will be a net emitter of energy when its temperature is
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
hydrogen
If a pizza absorbs more energy than it emits, its temperature
increases
When a volume of air is compressed, air temperature
increases
When a hot object makes thermal contact with a cold object, the direction of
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
is a poorer conductor.
When an object absorbs as much as it radiates
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
kinetic energy, but more speed
If a poor absorber of radiation were a good emitter, its temperature would be
less than its surroundings
The reason you can walk barefoot on red-hot coals of wood without burning your feet mainly involves
low conductivity of the coals.
When coal dust is spread on snow on a sunny day
more melting occurs
Which of these are good conductors?
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
off altogether
A good reflector of radiation is a
poor absorber of radiation
A Thermos bottle has double glass walls with silver coating on the glass surfaces that face each other. The silver coating reduces energy transfer by
radiation
A photovoltaic cell receives energy input by
radiation
The form of heat transfer that doesn't depend on a medium is
radiation
The planet Earth loses heat primarily by
radiation
Molecules in a region of expanding air more often collide with neighboring molecules that are
receding
Looking forward, common consensus will likely agree that the wisest use of fossil fuels is to
save them for tomorrow's materials
The higher the temperature of an object, the
shorter the wavelengths it radiates
In practice, a good insulator
slows heat flow.
Solar power is the rate at which
solar energy is received from the Sun
It is commonly thought that a can of beverage will cool faster in the coldest part of a refrigerator. Knowledge of Newton's law of cooling
supports this common knowledge
Sun's radiant energy is composed of shorter wavelengths than Earth's due to Sun's greater
surface temperature.
Heat normally flows from objects of high
temperature to objects of low temperature.
A water-filled paper cup held in a flame will not catch fire. This is because
the paper cup cannot become appreciably hotter than the water it contains.
Waves emitted by the Sun and terrestrial wave emissions are
the same except for their frequencies and wavelengths
At the same temperature, which has greater average speed in the air?
very light molecules
Which is the most abundant greenhouse gas in Earth's atmosphere
water vapor
Both black and white road surfaces radiate energy. At midnight on a starry night the warmer road surface is the
white surface
When you touch a nail stuck in ice, energy flows from
your hand to the ice.
A block of wood and a block of copper will feel neither hot nor cold to the touch when they each have
your temperature.