Question 1

A certain gas is compressed adiabatically.The amount of work done on the gas is 800 J.What is the change in the internal (thermal) energy of the gas?

Accepted Answer

A)  800 J
B)  -800 J
C)  400 J
D)  0 J
E)  More information is needed to answer this question.F) A) and E)
G) A) and B)

Question 2

A gas is taken through the cycle shown in the pV diagram in the figure.During one cycle,how much work is done by the gas? 0V0 B) 2 p0V0 C) 3 p0V0 D) 4 p0V0" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  p0V0
B)  2 p0V0
C)  3 p0V0
D)  4 p0V0E) A) and B)
F) A) and C)

Question 3

A Carnot engine operates between two reservoirs with unknown temperatures.If the Carnot engine operates at c/Th? A) 0.33 B) 0.0012 C) 0.0025 D) 0.67" class="answers-bank-image d-inline" rel="preload" >
Efficiency,what is the ratio of the absolute temperatures of the reservoirs,Tc/Th?

Accepted Answer

A)  0.33
B)  0.0012
C)  0.0025
D)  0.67E) None of the above
F) A) and B)

Question 4

The process shown on the pV diagram in the figure is

Accepted Answer

A)  adiabatic.
B)  isothermal.
C)  isochoric.
D)  isobaric.E) A) and C)
F) B) and D)

Question 5

The process shown on the pV diagram in the figure is an

Accepted Answer

A)  adiabatic expansion.
B)  isothermal expansion.
C)  isometric expansion.
D)  isobaric expansion.E) All of the above
F) C) and D)

Question 6

During each cycle,the compressor in a certain ideal Carnot refrigerator performs 480 J of work to remove 150 J of heat from the interior of the refrigerator.How much heat do the coils behind the refrigerator discharge into the kitchen each cycle?

Accepted Answer

A)  110 J
B)  150 J
C)  330 J
D)  480 J
E)  630 JF) A) and E)
G) B) and D)

Question 7

The figure shows a pV diagram for 0.0061 mol of ideal gas that undergoes the process 1 → 2 → 3.What is the pressure p2? (R = 8.31 J/mol ∙ K)  2? (R = 8.31 J/mol ∙ K)    A) 4.9 atm B) 4.9 × 105 atm C) 15 atm D) 1.5 × 106 atm" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  4.9 atm
B)  4.9 × 105 atm
C)  15 atm
D)  1.5 × 106 atmE) B) and C)
F) None of the above

Question 8

An ideal gas is compressed isobarically to one-third of its initial volume.The resulting pressure will be

Accepted Answer

A)  three times as large as the initial value.
B)  equal to the initial value.
C)  more than three times as large as the initial value.
D)  impossible to predict on the basis of this data.E) A) and D)
F) B) and C)

Question 9

An important feature of the Carnot cycle is that

Accepted Answer

A)  its efficiency can be 100%.
B)  its efficiency depends only on the absolute temperature of the hot reservoir used.
C)  its efficiency is determined by the temperatures of the hot and cold reservoirs between which it works and by the properties of the working substance used,and on nothing else.
D)  it is an example of an irreversible process that can be analyzed exactly without approximations.
E)  no engine can be more efficient than a Carnot engine operating between the same two temperatures.F) A) and E)
G) C) and E)

Question 10

An ideal reversible heat pump is taking heat from the outside air at -10.0°C and discharging it into the house at 18.0°C.What is the coefficient of performance of this heat pump?

Accepted Answer

A)  10.4
B)  9.44
C)  0.644
D)  0.533
E)  0.0962F) C) and E)
G) C) and D)

Exam 18: The Laws of Thermodynamics

A Carnot engine operates between two reservoirs with unknown temperatures.If the Carnot engine operates at Efficiency,what is the ratio of the absolute temperatures of the reservoirs,T_c/T_h?

Correct Answer
verified

The figure shows a pV diagram for 0.0061 mol of ideal gas that undergoes the process 1 → 2 → 3.What is the pressure p₂? (R = 8.31 J/mol ∙ K)

Correct Answer
verified

The process shown on the pV diagram in the figure is

Correct Answer
verified

An important feature of the Carnot cycle is that

Correct Answer
verified

A certain gas is compressed adiabatically.The amount of work done on the gas is 800 J.What is the change in the internal (thermal) energy of the gas?

Correct Answer
verified

During each cycle,the compressor in a certain ideal Carnot refrigerator performs 480 J of work to remove 150 J of heat from the interior of the refrigerator.How much heat do the coils behind the refrigerator discharge into the kitchen each cycle?

Correct Answer
verified

An ideal reversible heat pump is taking heat from the outside air at -10.0°C and discharging it into the house at 18.0°C.What is the coefficient of performance of this heat pump?

Correct Answer
verified

A gas is taken through the cycle shown in the pV diagram in the figure.During one cycle,how much work is done by the gas?

Correct Answer
verified

The process shown on the pV diagram in the figure is an

Correct Answer
verified

An ideal gas is compressed isobarically to one-third of its initial volume.The resulting pressure will be

Correct Answer
verified

Exam 18: The Laws of Thermodynamics

A Carnot engine operates between two reservoirs with unknown temperatures.If the Carnot engine operates at Efficiency,what is the ratio of the absolute temperatures of the reservoirs,Tc/Th?

Correct AnswerverifiedShow Answer

The figure shows a pV diagram for 0.0061 mol of ideal gas that undergoes the process 1 → 2 → 3.What is the pressure p2? (R = 8.31 J/mol ∙ K)

Correct AnswerverifiedShow Answer

The process shown on the pV diagram in the figure is

Correct AnswerverifiedShow Answer

An important feature of the Carnot cycle is that

Correct AnswerverifiedShow Answer

A certain gas is compressed adiabatically.The amount of work done on the gas is 800 J.What is the change in the internal (thermal) energy of the gas?

Correct AnswerverifiedShow Answer

During each cycle,the compressor in a certain ideal Carnot refrigerator performs 480 J of work to remove 150 J of heat from the interior of the refrigerator.How much heat do the coils behind the refrigerator discharge into the kitchen each cycle?

Correct AnswerverifiedShow Answer

An ideal reversible heat pump is taking heat from the outside air at -10.0°C and discharging it into the house at 18.0°C.What is the coefficient of performance of this heat pump?

Correct AnswerverifiedShow Answer

A gas is taken through the cycle shown in the pV diagram in the figure.During one cycle,how much work is done by the gas?

Correct AnswerverifiedShow Answer

The process shown on the pV diagram in the figure is an

Correct AnswerverifiedShow Answer

An ideal gas is compressed isobarically to one-third of its initial volume.The resulting pressure will be

Correct AnswerverifiedShow Answer

A Carnot engine operates between two reservoirs with unknown temperatures.If the Carnot engine operates at Efficiency,what is the ratio of the absolute temperatures of the reservoirs,T_c/T_h?

Correct Answer
verified

The figure shows a pV diagram for 0.0061 mol of ideal gas that undergoes the process 1 → 2 → 3.What is the pressure p₂? (R = 8.31 J/mol ∙ K)

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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