Question 1

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)

Accepted Answer

A) 4.9 atm 
B) 4.9 × 105 atm 
C) 15 atm 
D) 1.5 × 106 atm 
A) 4.9 atm 
B) 4.9 × 105 atm 
C) 15 atm 
D) 1.5 × 106 atm

Question 2

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

Question 3

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. 
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.

Question 4

The process shown on the pV diagram in the figure is

Accepted Answer

A) adiabatic. 
B) isothermal. 
C) isochoric. 
D) isobaric. 
A) adiabatic. 
B) isothermal. 
C) isochoric. 
D) isobaric.

Question 5

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. 
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.

Question 6

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. 
A) adiabatic expansion. 
B) isothermal expansion. 
C) isometric expansion. 
D) isobaric expansion.

Question 7

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) 0.0962 
A) 10.4 
B) 9.44 
C) 0.644 
D) 0.533 
E) 0.0962

Question 8

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

Question 9

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?

Accepted Answer

A) 0.33 
B) 0.0012 
C) 0.0025 
D) 0.67 
A) 0.33 
B) 0.0012 
C) 0.0025 
D) 0.67

Question 10

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?

Accepted Answer

A) p0V0 
B) 2 p0V0 
C) 3 p0V0 
D) 4 p0V0 
A) p0V0 
B) 2 p0V0 
C) 3 p0V0 
D) 4 p0V0

Exam 18: The Laws of Thermodynamics

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)

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?

An important feature of the Carnot cycle is that

The process shown on the pV diagram in the figure is

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

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

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?

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?

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?

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?

Introduction to Physics

One-Dimensional Kinematics

Vectors in Physics

Two-Dimensional Kinematics

Newtons Laws of Motion

Applications of Newtons Laws

Work and Kinetic Energy

Potential Energy and Conservation of Energy

Linear Momentum and Collisions

Rotational Kinematics and Energy

Rotational Dynamics and Static Equilibrium

Gravity

Oscillations About Equilibrium

Waves and Sound

Fluids

Temperature and Heat

Phases and Phase Changes

Electric Charges, Forces, and Fields

Electric Potential and Electric

Electric Current and Direct-Current Circuits

Magnetism

Magnetic Flux and Faradays Law of Induction

Alternating-Current Circuits

Electromagnetic Waves

Geometrical Optics

Optical Instruments

Physical Optics: Interference and Diffraction

Relativity

Quantum Physics

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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)

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?