Transcript Jeopardy Heat

Jeopardy
PHY101
Chapter 5 Review
Study of Heat
Study of Heat
Basics
Constants
Heat
Transfer
Laws
Potpourri
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Basics
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What is meant by thermal
contact?
ANSWER
Basics
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What is meant by thermal
equilibrium?
ANSWER
Basics
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Name the three temperature scales
that are in common use. Give the
boiling point and the freezing point
of water, and absolute temperature in
each scale.
ANSWER
Basics
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What does Temperature
measure?
ANSWER
Constants
$100
What is Avogadro’s number?
ANSWER
Constants
$200
What is the Boltzmann’s
Constant?
ANSWER
Constants
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What is the Universal Gas
Constant?
ANSWER
Constants
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What is the Specific Heat of
water?
ANSWER
Heat
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What is Heat?
ANSWER
Heat
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What is Internal energy?
ANSWER
Heat
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What is meant by thermal
expansion?
ANSWER
Heat
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Temperature at which water
has the greatest density.
ANSWER
Transfer
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What are the 3 methods of
Heat Transfer?
ANSWER
Transfer
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“Firewalkers" step on the hot
ashes and coals from a wood fire
without getting their feet burned.
How might this be possible?
ANSWER
Transfer
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A wood stove in the corner of
a cabin causes the entire cabin
to become heated. This is an
example of __________.
ANSWER
Transfer
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Which mechanism of heat
transfer will work in a
vacuum?
ANSWER
Laws
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State the zeroth law of
thermodynamics.
ANSWER
Laws
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State the first law of
thermodynamics.
ANSWER
Laws
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State the second law of
thermodynamics.
ANSWER
Laws
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What is the Ideal Gas Law?
ANSWER
Potpourri $100
When water boils, its
temperature _______.
ANSWER
Potpourri $200
When droplets of condensation form
on the outside of a glass of ice water,
it must be that in the air right next to
the glass is at _______.
ANSWER
Potpourri $300
Natural processes tend to
increase the _____ of
thermodynamic systems.
ANSWER
Potpourri $400
The air temperature where the
humidity reaches the
saturation density is called the
___________.
ANSWER
Basics
$100
Answer
What is meant by thermal contact?
Heat energies can be exchanged.
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Basics
$200
Answer
What is meant by thermal equilibrium?
Both objects are at the same
temperature.
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Basics
$300
Answer
Name the three temperature scales that are in common use. Give the
boiling point and the freezing point of water, and absolute temperature in
each scale.
Temperature
at 1 atm.
Fahrenheit
Celsius
Kelvin
Boiling water
212OF
100OC
373.15 K
Freezing Water
32OF
0OC
273.15 K
Absolute Zero
-459.67OF
-273.15OC
0K
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Basics
$400
Answer
What does Temperature measure?
The average kinetic energy of atoms and molecules in a
substance.
K.E. ATOM = ½mvAVE² = ½kBT
where T in Kelvin
Boltzmann’s Constant kB =1.38*10-23 J/K
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Constants
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Answer
What is Avogadro’s number?
NA = 6.02 *1023 units
1 mole contains Avogadro’s number.
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Constants
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Answer
What is the Boltzmann’s Constant?
kB =1.38*10-23 J/K
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Constants
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Answer
What is the Universal Gas Constant?
R = NAkB = 8.31 J/(mole*K)
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Constants
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Answer
What is the Specific Heat of water?
cW = 1.00 cal/(g*OC) = 4186 J/(kg*K)
Q = mcWT
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Heat
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Answer
What is Heat?
The form of energy that is transferred between two substances
because they have different temperatures.
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Heat
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Answer
What is Internal energy?
The sum of the kinetic and potential energies of all the atoms
and molecules in a substance.
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Heat
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Answer
What is meant by thermal
expansion?
The size of an object will change due a temperature
Usually, increasing temperature but cause an increase in size.
L = LOT where  = thermal coefficient in 1/OC
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Heat
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Answer
Temperature at which water has
the greatest density.
4 OC
The density of water decreases as water cools from 4OC to 0OC.
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Transfer
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Answer
What are the 3 methods of Heat Transfer?
Conduction Direct (Needs physical Contact)
Convection Occurs in fluids
Radiation Carried by photon
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Transfer
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Answer
Firewalkers" step on the hot ashes and
coals from a wood fire without getting
their feet burned. How might this be
possible?
The ashes are poor conductors of heat.
H = kAT/L where k = thermal conductivity coefficient in
Watts/(m*K)
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Transfer
$300
Answer
A wood stove in the corner of
a cabin causes the entire cabin
to become heated. This is an
example of convection.
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Transfer
$400
Answer
Which mechanism of heat
transfer will work in a vacuum?
Radiation
Power = AT4
 = 5.67*10-8 Watts/(m²*K4)
 = emissitivity constant is between 0 (reflector) & 1 (absorber)
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Laws
$100
Answer
State the zeroth law of thermodynamics.
If Body A in in thermal equilibrium with Body B &
If Body B in in thermal equilibrium with Body T then
Body A in in thermal equilibrium with Body T.
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Laws
$200
Answer
State the first law of thermodynamics.
Conservation of energy
Internal Energy of a system = Q – Work done by a system OR
Internal Energy of a system = Q + Work done on a system
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Laws
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Answer
State the second law of thermodynamics.
There are no perfect heat engines.
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Laws
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Answer
What is the Ideal Gas Law?
PV = NkBT = nRT
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Potpourri $100
Answer
When water boils, its
temperature stays constant.
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Potpourri $200
Answer
When droplets of condensation form on
the outside of a glass of ice water, it must
be that in the air right next to the glass.
The relative humidity is near 100%.
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Potpourri $300
Answer
Natural processes tend to
increase the entropy of
thermodynamic systems
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Potpourri $400
Answer
The air temperature where the
humidity reaches the saturation
density is called the dew point.
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