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
$400
What does Temperature measure?
ANSWER

Constants
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What is Avogadro’s number?
ANSWER

Constants
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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.
Boiling water
Fahrenheit
212 O F
Freezing Water 32 O F
Absolute Zero -459.67
O F
Celsius
100 O C
0 O C
-273.15
O C
Kelvin
373.15 K
273.15 K
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
= ½mv
AVE
² = ½k
B
T where T in Kelvin
Boltzmann’s Constant k
B
=1.38*10 -23 J/K
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Constants
$100
Answer
What is Avogadro’s number?
N
A
= 6.02 *10 23 units
1 mole contains Avogadro’s number.
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Constants
$200
Answer
What is the Boltzmann’s Constant?
k
B
=1.38*10 -23 J/K
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Constants
$300
Answer
What is the Universal Gas Constant ?
R = N
A k
B
= 8.31 J/(mole*K)
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Constants
$400
Answer
What is the Specific Heat of water?
c
W
= 1.00 cal/(g* O C) = 4186 J/(kg*K)
 Q = mc
W
 T
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Heat
$100
Answer
What is Heat?
The form of energy that is transferred between two substances because they have different temperatures.
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Heat
$200
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 = L
O
 T where  = thermal coefficient in 1/ O C
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Heat
$400
Answer
Temperature at which water has the greatest density.
4 O C
The density of water decreases as water cools from 4 O C to 0 O C.
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Transfer
$100
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
$200
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*K 4 )
 = 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
$300
Answer
State the second law of thermodynamics.
There are no perfect heat engines.
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Laws
$400
Answer
What is the Ideal Gas Law?
PV = Nk
B
T = 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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