ch 7
coffee is served at a restaurant before you are ready to drink it. to be hottest when you are ready to drink it, you should add cream
right away
to save the most energy when you leave your cool house for an hour or so on a hot day, you should turn the temperature setting on the air conditioner
up
because of trapped air inside, snow is a
both of these
if an object radiates more energy than it absorbs, its
both of these
warm air rises because faster moving molecules tend to move to regions of less
both of these
conduction has most to do with electrons and atoms
bumping into one another
a red-hot piece of iron will cool slower in a
cold room
in terms of transferring heat, red-hot wooden coals
conduct poorly
If air were a better conductor than it is, at nighttime the Earth would be
considerably colder
coastal winds that shift from night to day illustrate
convection
blow in your hand and feel the warmth of your breathe. pucker you're lips so your breath expands as you blow and your breath is
cool
newton's law of cooling applies to things that are
cooling
hot steam that issues from a pressure cooker expands and
cools
if a volume of air is warmed, it expands. if a volume of air expands, it
cools
a star that is twice as hot as another has twice the
fahrenheit temperature
Compared to a glass of ice water with ice in it, a glass of plain ice-cold water without ice on a warm day will warm up
faster
the process of convection occurs in
fluids
a good absorber of radiation is a
good emitter of radiation
a poor conductor of heat is a
good insulator
radiant energy from the sun is composed of shorter wavelengths than radiation from the earth because the sun
has a higher temperature than the earth
a piece of pizza is normally a net radiator of energy when its temperature is
higher than its surroundings
an apple pie will be a net of emitter of energy when it's temperature is
higher than its surroundings
the higher the temperature of an object, the
higher the frequency of emitted radiation
if a pizza absorbs more energy than it emits, its temperature
increases
when air is compressed, its temperature
increases
your bare feet feel warmer on a rug than on a tile floor because the rug
is a better insulator than tile
the average frequency of radiant energy is directly proportional to the
kelvin temperature of the emitter.
metals are both good heat and electrical conductors due to
looseness of outer electrons in metal atoms
the main reason you can walk barefoot on red-hot coals of wood without burning your feet involves
low conductivity of the coals
a blueberry pie will be a net absorber of energy when its temperature is
lower than its surroundings
if an object absorbs more energy than it emits, it's
none of the above
which of these are good conductors
none of the above
an infrared thermometer operates by way of
none of these
when you leave your warm house for an hour or so on a cold day, to save energy you should turn the thermostat
off
a good reflector of radiation is a
poor absorber of radiation
spun glass is a relatively
poor conductor
a photovoltaic cell receives energy input primarily by
radiation
a substance most commonly emits heat energy by the process of
radiation
the silver lining on the glass surfaces of a Thermos bottle reduces energy that is transferred by
radiation
which emits radiation of the highest frequency
a blue-hot star
a good heat conductor is
a poor insulator
the gush of steam that issues from the escape valve of a pressure cooker is relatively cool
above the opening where vapor is visible
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
heat radiation relates mainly to
all of the above
radiant energy emitted by our planet is
all of the above
which body continually emits electromagnetic waves?
all of the above
which of these are good insulators
all of the above
wood is a poor conductor
all of the above
if you were caught in freezing weather with only a candle for heat, you would be warmer in
an igloo
cold water will warm to room temperature faster in a
black pot
hot water will cool to room temperature faster in a
black pot
the higher the temperature of an object, the
shorter the wavelengths it radiates
the higher the frequency of a wave, the
shorter wavelength
to minimize heat loss it is best that a teapot be
silver
in practice, a good insulator
slows heat flow
it's commonly thought that a can of beverage will cool faster in the coldest parts of a refrigerator. knowledge of newton's always of cooling
supports this
peak frequency as noted on a radiation curve is directly proportional to the
temperature of the emitter
a watermelon will cool faster when placed in what part of a refrigerator
the freezer compartment
a water-filled paper cup held in a flame will not catch fire because
the paper cup cannot become appreciably hotter than the water it contains
convection currents in the air near a seashore are produced by
unequal heating of land and water
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