chapter 21 Concept Physics 1/11/16
which is denser, water at 4 degrees celsius or ice at 0 degrees celsius?
water
t/f: a temp scale that has 100 degrees between the boiling and the freezing point of water is the celsius scale
true
t/f: average kinetic energy of molecules in a substance is related to temp
true
t/f: heat and work both involve transfers of energy
true
t/f: liquids usually expand when heated
true
t/f: the amount of heat required to change the temp of a unit mass of a substance by one degree celsius is its specific heat capacity.
true
bimettalic strip
two strips of different metals, such as one of brass and one of iron , welded or riveted together into one strip. because the 2 substances expand at different rates, when heated or cooled the strip bends. used in thermostats
thermostat
type of valve or switch that responds changes in temp and that is used to control the temp of something.
kilocalorie
unit of heat. equals 1000 calories, or the amount of heat required to raise the temperature of one kilogram of water by one degree celsius
calorie
unit of heat. heat required to raise the temperature of one gram of water one celsius degree.
the reason that fish can live in a pond that freezes over is because blank
water below the ice is 4 degrees above freezing
heat is the blank
energy transferred between objects because of a temp difference
to heat 1kg of water by 1 degree celsius requires
1 calorie
a change in temp of 15 degrees celsius is a change of blank kelvins.
15
a temperature of 20 degrees celsius is equal to blank kelvins
293
how would the average temperature of a healthy human, which is 37 celsius be represented in kelvins?
310 kelvins
a container of water has its smallest volume at blank celsius
4
mix a liter of 30 degrees celsius water with one liter of 70 degree celsius water and you will have 2 liters of water at blank degrees celsius
50
mix 2 liters of 40 degree celsius with 3 liters of 80 degree celsius water and you'll have 5 liters of water at blank degrees celsius
64
the formula used to calculate ^T is
^T=Tr-Ti
the temperature at which all molecular motion stops is called blank
absolute zero
the energy content of a piece of food is determined by blank the food.
burning
specific heat can be measured in both blank
calories j/kg celsius
in the equation Q= m x c x ^Tthe symbol means blank
change
water blank when heated from 0 degrees celsius to 4 degrees celsius
contracts
bimetallic strips will bend when heated because metals expand at blank rates
different
heat
energy transfer via random molecular motions, resulting in gain or loss of internal energy
during a very cold winter water pipes sometimes burst because water blank while freezing
expands
t/f: a bimetallic strip consists of two strips of the same material welded together
false
t/f: a calorie is a common unit of power
false
t/f: an instrument used to measure temperature is a barometer
false
t/f: energy that is stored is kinetic energy
false
t/f: energy transferred when force acts over distance is heat energy
false
t/f: fast moving molecules have less kinetic energy than slow moving molecules
false
energy that flows from something with a higher temperature to something with a lower temperature is blank
heat
putting a dented table tennis ball in a pot of boiling water will help remove the dent because as air inside the ball is blank the air blank and pushes blank on the dented ball
heated expands outward
the total energy of the particles that make up a material is blank
internal energy
as the temperature of a material decreases, the average blank of its particles also decrease
kinetic energy
temperature is a measure of the average
kinetic energy
when an iron ring is heated, the hole becomes blank
larger
the fact that desert sand is very hot in the day and very cold at night is because it has a blank specific heat
low
temperature
property of a material that tells how hot or cold something is relative to some standard. in an ideal gas, the molecular kinetic energy per molecule.
specific heat capacity
quantity of heat required to raise the temperature of a unit mass of a substance by one degree celsius.
the amount of energy it takes to raise the temp of 1kg of material by blank
specific heat
thermal contact
state of two or more objects or substances in contact such that its possible for heat to flow from one object or substance to another
thermal equilibrium
state of two or more objects or substances in thermal contact when they have reached a common temperature.
fahrenheit scale
temp scale commonly used in the United States. 32 is the freezing point, and 212 is boiling (at standard atmospheric pressure)
kelvin scale
temp scale whose zero (called absolute zero) is the temp at which its impossible to extract anymore internal energy from a material.
a measure of the average kinetic energy of the molecules in a sample of matter in an object's blank
temperature
absolute zero
temperature at which a substance has no kinetic energy per particle to give up. 0K or -273 celsius
celsius scale
temperature scale with 0as the melt-freeze temp for water and 100 as the boil-condense temp of water at standard pressure (one atmosphere at sea level)
the rise of fluid in a thermometer is a result of blank
thermal expansion
internal energy is the blank
total amount of energy contained in an object
internal energy
total energy stored in the atoms and molecules within a substance
