physics chapter 21 test
When 4 grams of substance loses 4 calories in cooling 1 degree Celsius, its specific heat capacity using water as the unit of measure is
1
a change in temperature of 10 degrees C is equal to a change of
10 K
Mix 3 liters of 20°C water with 4 liters of 30°C water and you'll have 7 liters of water at ...
26 degrees Celsius
a container of water has its smallest volume at
4 degrees Celsius
one thousand calories of heat are added to 150 grams of water when its temperature is 33 degrees C. the resulting temperature of the water is
40 degrees C
Mix a liter of 70°C water with 2 liters of 40°C water and you'll have 3 liters of water at _____.
50 degrees celsius
a calorie is a common unit of force
F
a substance at a high temperature is said to contain heat
F
a temperature scale that has 100 degrees between the boiling point and the freezing point of water is the Fahrenheit scale
F
gases don't expand very much when heated
F
the total of all energies in a substance is its temperature
F
heat is the energy that moves from one object to another because of a temperature difference
T
if you measure the temperature of room air, them the heat absorbed by the thermometer does not lower the air temperature noticeably.
T
liquids usually expand when heated
T
the amount of heat required to change the temperature of a unit mass of a substance by 1 degree is its specific heat capacity
T
the average kinetic energy of molecules in a substance is related to temperature
T
Mix some 70 degree celsius water with some 40 degree celsius, and you'll get water at
a temperature depending on the masses (or volumes) of water
temperature is related mostly to the
average molecular kinetic energy in a substance
which temperature scale labels the freezing point of water at 0 degrees
celcius
a bimetallic strip will bend when heated because
each metal expands at different rates
the energy content of a piece of food is normally determined by
eating the piece of food
heat is the
energy transferred between objects because of a temperature difference
when water at 4 degrees Celsius is heated, it expands. when water at 4 degrees C is cooled, it
expands
your grandmother places a pitcher of iced tea next to a plate of warm, freshly baked cookies so that the pitcher and the plate are touching. you tell your grandmother that the plates in the thermal contact, which means that
heat flows from the warm plate to the cold pitcher
some molecules are able to absorb large amounts of energy in the form of internal vibrations and rotations. materials composed of such molecules would have
high specific heat capacities
the largest extremes in temperature are usually experienced
in the middle of a continent
you are feeling sick, so you place a thermometer under your tongue to check your temperature. the directions on the box tell you to leave the thermometer there for three minutes before you read your temperature. why should you wait?
it takes some time for the thermometer and your body to reach thermal equilibrium
heat is measured in
joules
when an iron is heated, the hole becomes
larger
if the specific heat capacity of water were higher than it is, lake would be
less likely to freeze
the fact that desert sand is very hot in the day and very cold at night is evidence hat sand has a
low specific heat capacity
specific heat capacity is related to the amount of internal energy
needed to change the temperature of one gram of a substance one degree
in the deserts of Africa, a certain species of ant thrives in searing temperatures. the ants touch the hot sand as little as possible, and they sprint with four legs in the ground and two legs in the air at any given time. by minimizing their contact with the hot desert sand, the ants are
reaching thermal equilibrium with the sand less quickly.
a piece of iron and a cup of water both have the same temperature. if they are heated so the internal energy of each doubles.
the iron will have the higher temperature
which is denser, ice at 0 degrees C or water at 4 degrees C
the water
internal energy is the
total amount of energy contained in an object
which has the higher specific heat capacity, water or sane
water
which releases the most energy, 100 grams of 100 degree C water cooling to 50 degrees C, or 100 grams of iron at 100 degrees C cooling to 50 degrees C?
water
which of the following expands most when the temperature is lowered
water at 4 degrees Celsius
the reason fish live from year to year in ponds that freeze over in the winter is that
water below the live is 4 degrees above freezing
during a very cold winter, water pipes sometimes burst. the reason for this is
water expands when freezing
the reason an oceans temperature doesn't vary much from one season to the next is that
water has a high specific heat capacity
which, at the same temperature, will cool more slowly on a hot day
watermelon
Consider a gap cut into a metal ring. If the ring is heated, the gap becomes
wider
