On a PV diagram,2 curves are plotted,both starting at the same point (P1,V1)and both ending at the same increased volume (V2).One curve is for an isothermal process;the other is for an adiabatic process.Except for the common starting point,which curve is the upper one?

A) The isothermal process curve will always be the upper one. B) The adiabatic process curve will always be the upper one. C) Since they start at the same point and end at the same volume,they will coincide. D) The isothermal one will start out higher,but the adiabatic one will eventually cross it. A) The isothermal process curve will always be the upper one. B) The adiabatic process curve will always be the upper one. C) Since they start at the same point and end at the same volume,they will coincide. D) The isothermal one will start out higher,but the adiabatic one will eventually cross it.

A refrigerator has a coefficient of performance of 4.When removing 2.3 × 104 J from inside the refrigerator,how much energy is sent into the environment?

A) 0.6 × 104 J B) 2.9 × 104 J C) 9.2 × 104 J D) 11.5 × 104 J E) 3.6 × 104 J A) 0.6 × 104 J B) 2.9 × 104 J C) 9.2 × 104 J D) 11.5 × 104 J E) 3.6 × 104 J

Exam 12: The Laws of Thermodynamics Work in Thermodynamic Processes

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The maximum theoretical thermodynamic efficiency of a heat engine operating between hot and cold reservoirs is a function of which of the following?

(Multiple Choice)

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Question 21

A 2-mol ideal gas system undergoes an adiabatic process where it expands and does 16 J of work on its environment.What is its change in internal energy?

(Multiple Choice)

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Question 22

A heat engine receives 7,100 J of heat from its combustion process and loses 3,100 J through the exhaust and friction.What is its efficiency?

(Multiple Choice)

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Question 23

An 870-MW electric power plant has an efficiency of 30%.It loses its waste heat in large cooling towers.Approximately how much waste heat (in MJ)is discharged to the atmosphere per second?

(Multiple Choice)

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Question 24

A Carnot engine runs between a hot reservoir at T_h and a cold reservoir at T_c.If one of the temperatures is either increased or decreased by 3.5 K,which of the following changes would increase the efficiency by the greatest amount?

(Multiple Choice)

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Question 25

During an isobaric process which one of the following does not change?

(Multiple Choice)

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Question 26

An electrical generating plant operates at a boiler temperature of 229°C and exhausts the unused heat into a nearby river at 18°C.If the generating plant has a power output of 870 megawatts (MW)and if the actual efficiency is 3/4 the theoretical efficiency,how much heat per second must be delivered to the boiler? (0°C = 273 K)

(Multiple Choice)

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Question 27

On a PV diagram,2 curves are plotted,both starting at the same point (P₁,V₁)and both ending at the same increased volume (V₂).One curve is for an isothermal process;the other is for an adiabatic process.Except for the common starting point,which curve is the upper one?

(Multiple Choice)

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Question 28

Area on a P-V diagram has units associated with:

(Multiple Choice)

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Question 29

A 5-mol ideal gas system undergoes an adiabatic free expansion (a rapid expansion into a vacuum),going from an initial volume of 30 L to a final volume of 50 L.How much work is done on the system during this adiabatic free expansion?

(Multiple Choice)

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Question 30

What is the change in entropy (ΔS)when one mole of silver (102 g)is completely melted at 962°C? (The heat of fusion of silver is 8.82 × 10⁴ J/kg. )

(Multiple Choice)

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Question 31

In an isobaric process 5 × 10⁴ J of work is done on a quantity of gas while its volume changes from 2.8 m³ to 1.8 m³.What is the pressure during this process?

(Multiple Choice)

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Question 32

A refrigerator has a coefficient of performance of 4.When removing 2.3 × 10⁴ J from inside the refrigerator,how much energy is sent into the environment?

(Multiple Choice)

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Question 33

An electrical power plant manages to send 87% of the heat produced in the burning of fossil fuel into the water-to-steam conversion.Of the heat carried by the steam,40% is converted to the mechanical energy of the spinning turbine.Which of the following choices best describes the overall efficiency of the heat-to-work conversion in the plant (as a percentage)?

(Multiple Choice)

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Question 34

The surface of the Sun is at approximately 5 700 K and the temperature of the Earth's surface is about 290 K.What total entropy change occurs when 980 J of heat energy is transferred from the Sun to the Earth?

(Multiple Choice)

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Question 35

The volume of an ideal gas changes from 0.3 to 0.52 m³ although its pressure remains constant at 58,000 Pa.What work is done on the system by its environment?

(Multiple Choice)

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Question 36

A 2.05-kg block of ice is at STP (0°C,1 atm)while it melts completely to water.What is its change in entropy? (For ice,L_f = 3.34 × 10⁵ J/kg)

(Multiple Choice)

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Question 37

Which of the following choices is an appropriate unit for measuring entropy changes?

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Question 38

1.2 kilogram of water at 1.00 atm at the boiling point of 100°C is heated until all the water vaporizes.What is its change in entropy? (For water,L_v = 2.26 × 10⁶ J/kg)

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Question 39

Entropy is a measure of the ____ of a system.

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Question 40

Showing 21 - 40 of 70

Exam 12: The Laws of Thermodynamics Work in Thermodynamic Processes

The maximum theoretical thermodynamic efficiency of a heat engine operating between hot and cold reservoirs is a function of which of the following?

A 2-mol ideal gas system undergoes an adiabatic process where it expands and does 16 J of work on its environment.What is its change in internal energy? ​

A heat engine receives 7,100 J of heat from its combustion process and loses 3,100 J through the exhaust and friction.What is its efficiency? ​

An 870-MW electric power plant has an efficiency of 30%.It loses its waste heat in large cooling towers.Approximately how much waste heat (in MJ)is discharged to the atmosphere per second? ​

A Carnot engine runs between a hot reservoir at Th and a cold reservoir at Tc.If one of the temperatures is either increased or decreased by 3.5 K,which of the following changes would increase the efficiency by the greatest amount?

During an isobaric process which one of the following does not change?

On a PV diagram,2 curves are plotted,both starting at the same point (P1,V1)and both ending at the same increased volume (V2).One curve is for an isothermal process;the other is for an adiabatic process.Except for the common starting point,which curve is the upper one?

Area on a P-V diagram has units associated with:

A 5-mol ideal gas system undergoes an adiabatic free expansion (a rapid expansion into a vacuum),going from an initial volume of 30 L to a final volume of 50 L.How much work is done on the system during this adiabatic free expansion? ​

What is the change in entropy (ΔS)when one mole of silver (102 g)is completely melted at 962°C? (The heat of fusion of silver is 8.82 × 104 J/kg. ) ​

In an isobaric process 5 × 104 J of work is done on a quantity of gas while its volume changes from 2.8 m3 to 1.8 m3.What is the pressure during this process? ​

A refrigerator has a coefficient of performance of 4.When removing 2.3 × 104 J from inside the refrigerator,how much energy is sent into the environment? ​

The surface of the Sun is at approximately 5 700 K and the temperature of the Earth's surface is about 290 K.What total entropy change occurs when 980 J of heat energy is transferred from the Sun to the Earth? ​

The volume of an ideal gas changes from 0.3 to 0.52 m3 although its pressure remains constant at 58,000 Pa.What work is done on the system by its environment? ​

A 2.05-kg block of ice is at STP (0°C,1 atm)while it melts completely to water.What is its change in entropy? (For ice,Lf = 3.34 × 105 J/kg) ​

Which of the following choices is an appropriate unit for measuring entropy changes?

1.2 kilogram of water at 1.00 atm at the boiling point of 100°C is heated until all the water vaporizes.What is its change in entropy? (For water,Lv = 2.26 × 106 J/kg) ​

Entropy is a measure of the ____ of a system.

Introduction

Introduction: Part A

Motion in One Dimension

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

Vectors and Two-Dimensional Motion: Part A

The Laws of Motion

The Laws of Motion: Part A

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Thermal Physics: Part A

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Sound: Part A

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Reflection and Refraction of Light: Part A

Mirrors and Lenses

Mirrors and Lenses: Part A

Wave Optics

Wave Optics: Part A

Optical Instruments

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles

Nuclear Energy and Elementary Particles: Part A

Particle Collisions, Mediating Photons, and Quark Structures: Exploring the Fundamentals of Physics

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A 2-mol ideal gas system undergoes an adiabatic process where it expands and does 16 J of work on its environment.What is its change in internal energy?

A heat engine receives 7,100 J of heat from its combustion process and loses 3,100 J through the exhaust and friction.What is its efficiency?

An 870-MW electric power plant has an efficiency of 30%.It loses its waste heat in large cooling towers.Approximately how much waste heat (in MJ)is discharged to the atmosphere per second?

A Carnot engine runs between a hot reservoir at T_h and a cold reservoir at T_c.If one of the temperatures is either increased or decreased by 3.5 K,which of the following changes would increase the efficiency by the greatest amount?

On a PV diagram,2 curves are plotted,both starting at the same point (P₁,V₁)and both ending at the same increased volume (V₂).One curve is for an isothermal process;the other is for an adiabatic process.Except for the common starting point,which curve is the upper one?

A 5-mol ideal gas system undergoes an adiabatic free expansion (a rapid expansion into a vacuum),going from an initial volume of 30 L to a final volume of 50 L.How much work is done on the system during this adiabatic free expansion?

What is the change in entropy (ΔS)when one mole of silver (102 g)is completely melted at 962°C? (The heat of fusion of silver is 8.82 × 10⁴ J/kg. )

In an isobaric process 5 × 10⁴ J of work is done on a quantity of gas while its volume changes from 2.8 m³ to 1.8 m³.What is the pressure during this process?

A refrigerator has a coefficient of performance of 4.When removing 2.3 × 10⁴ J from inside the refrigerator,how much energy is sent into the environment?

The surface of the Sun is at approximately 5 700 K and the temperature of the Earth's surface is about 290 K.What total entropy change occurs when 980 J of heat energy is transferred from the Sun to the Earth?

The volume of an ideal gas changes from 0.3 to 0.52 m³ although its pressure remains constant at 58,000 Pa.What work is done on the system by its environment?

A 2.05-kg block of ice is at STP (0°C,1 atm)while it melts completely to water.What is its change in entropy? (For ice,L_f = 3.34 × 10⁵ J/kg)

1.2 kilogram of water at 1.00 atm at the boiling point of 100°C is heated until all the water vaporizes.What is its change in entropy? (For water,L_v = 2.26 × 10⁶ J/kg)