A heat engine operates between a hot reservoir at 1500 K and a cold reservoir at 500 K. During each cycle, 1.0 × 10S1U1P15S1S1P0 J of heat is removed from the hot reservoir and 5.0 × 10S1U1P14S1S1P0 J of work is performed. -Determine the change in entropy of the cold reservoir.

A) -1.0 × 102 J/K B) +1.0 × 102 J/K C) -1.8 × 102 J/K D) +1.8 × 102 J/K E) -2.0 × 102 J/K A) -1.0 × 102 J/K B) +1.0 × 102 J/K C) -1.8 × 102 J/K D) +1.8 × 102 J/K E) -2.0 × 102 J/K

Exam 15: Thermodynamics

A paddle wheel frictionally adds thermal energy to an ideal monatomic gas in a sealed, insulated container. The paddle wheel is driven by a cord connected to a falling object as shown in the drawing. In this experiment, a 5.0-kg object falls through a total distance of 3.0 m and the temperature of the gas is found to increase by 6 C°. Assume that all of the mechanical energy lost by the falling object goes into the gas. How many moles of gas must be present in this container?

(Multiple Choice)

4.8/5

(86)

Question 41

A system containing an ideal gas at a constant pressure of 1.42 × 10⁵ Pa gains 2320 J of heat. During the process, the internal energy of the system increases by 2540 J. What is the change in volume of the gas?

(Multiple Choice)

4.7/5

(84)

Question 42

Which one of the following pressure-volume graphs represents an isochoric process?

(Multiple Choice)

4.8/5

(67)

Question 43

Complete the following statement: Walls that separate a system from its surroundings and permit heat to flow through them are called

(Multiple Choice)

4.8/5

(86)

Question 44

Determine the quantity of heat added to 2.8 moles of the ideal gas argon if the temperature increases from 75 °C to 225 °C during an isobaric process. Note: The molar specific heats of argon are C_V = 3.0 cal/K·mol and C_P = 5.0 cal/K·mol.

(Multiple Choice)

4.7/5

(85)

Question 45

A container holding 1.2 kg of water at 20.0 °C is placed in a freezer that is kept at -20.0 °C. The water freezes and comes into thermal equilibrium with the interior of the freezer. -How much heat is extracted from the water in this process?

(Multiple Choice)

4.9/5

(82)

Question 46

If the coefficient of performance for a refrigerator is 5.0 and 72 J of work are done on the system, how much heat is rejected to the room?

(Multiple Choice)

4.8/5

(74)

Question 47

A 1.00-kg sample of steam at 100.0 °C condenses to water at 100.0 °C. What is the entropy change of the sample if the heat of vaporization of water is 2.26 × 10⁶J/kg?

(Multiple Choice)

4.9/5

(73)

Question 48

Which one of the following processes represents a decrease in entropy?

(Multiple Choice)

4.8/5

(75)

Question 49

Which one of the following statements is true concerning the ratio of the molar heat capacities C_p/C_vfor an ideal gas?

(Multiple Choice)

4.7/5

(84)

Question 50

One mole of a monatomic gas at 433 K is reversibly taken to half of its original volume by an isobaric process. How much work is done by the gas?

(Multiple Choice)

4.8/5

(96)

Question 51

Neon is a monatomic gas with a molar heat capacity at constant volume of 12.66 J/(mol · K). Two moles of neon gas enclosed in a constant volume system receive 4250 J of heat. If the gas was initially at 293 K, what is the final temperature of the neon?

(Multiple Choice)

4.9/5

(80)

Question 52

A heat pump extracts 7.0 × 10⁶ J of heat per hour from a well at 280 K and delivers its output heat into a house at 320 K. If the heat pump uses an ideal Carnot cycle in its operation, what minimum work must be supplied to the heat pump per hour?

(Multiple Choice)

4.9/5

(86)

Question 53

A paddle wheel frictionally adds thermal energy to 4.0 moles of an ideal monatomic gas in a sealed insulated container. The paddle wheel is driven by a cord connected to a falling object as shown in the drawing. How far has the 5.0-kg object fallen when the temperature of the gas increases by 7.50 K?

(Multiple Choice)

4.9/5

(88)

Question 54

Two moles of an ideal gas have an initial Kelvin temperature Ti and absolute pressure Pi. The gas undergoes a reversible isothermal compression from an initial volume Vi to a final volume 0.5Vi. -How much heat is exchanged with the environment? If heat is exchanged, is it absorbed or released?

(Multiple Choice)

4.8/5

(87)

Question 55

A heat engine operates between a hot reservoir at 1500 K and a cold reservoir at 500 K. During each cycle, 1.0 × 10⁵ J of heat is removed from the hot reservoir and 5.0 × 10⁴ J of work is performed. -Determine the change in entropy of the cold reservoir.

(Multiple Choice)

4.9/5

(75)

Question 56

Which of the following samples exhibits the highest degree of entropy?

(Multiple Choice)

4.8/5

(76)

Question 57

An ideal monatomic gas originally in state A is taken reversibly to state B along the straight-line path shown in the pressure-volume graph. -What is the change in the internal energy, in calories, of the gas for this process?

(Multiple Choice)

4.7/5

(69)

Question 58

A heat engine operates in a Carnot cycle between reservoirs of temperatures 1000 K and 400 K. It is found to discharge 20 J of heat per cycle to the cold reservoir. What is the work output per cycle?

(Multiple Choice)

4.8/5

(79)

Question 59

A fixed amount of ideal gas is compressed isothermally. Which entry in the table below correctly depicts the sign of the work done, the change in the internal energy, and the heat exchanged with the environment? work done change in internal energy heat exchanged

(Multiple Choice)

4.7/5

(69)

Question 60

Showing 41 - 60 of 79

Exam 15: Thermodynamics

A system containing an ideal gas at a constant pressure of 1.42 × 105 Pa gains 2320 J of heat. During the process, the internal energy of the system increases by 2540 J. What is the change in volume of the gas?

Which one of the following pressure-volume graphs represents an isochoric process?

Complete the following statement: Walls that separate a system from its surroundings and permit heat to flow through them are called

Determine the quantity of heat added to 2.8 moles of the ideal gas argon if the temperature increases from 75 °C to 225 °C during an isobaric process. Note: The molar specific heats of argon are CV = 3.0 cal/K·mol and CP = 5.0 cal/K·mol.

A container holding 1.2 kg of water at 20.0 °C is placed in a freezer that is kept at -20.0 °C. The water freezes and comes into thermal equilibrium with the interior of the freezer. -How much heat is extracted from the water in this process?

If the coefficient of performance for a refrigerator is 5.0 and 72 J of work are done on the system, how much heat is rejected to the room?

A 1.00-kg sample of steam at 100.0 °C condenses to water at 100.0 °C. What is the entropy change of the sample if the heat of vaporization of water is 2.26 × 106 J/kg?

Which one of the following processes represents a decrease in entropy?

Which one of the following statements is true concerning the ratio of the molar heat capacities Cp/Cv for an ideal gas?

One mole of a monatomic gas at 433 K is reversibly taken to half of its original volume by an isobaric process. How much work is done by the gas?

Neon is a monatomic gas with a molar heat capacity at constant volume of 12.66 J/(mol · K). Two moles of neon gas enclosed in a constant volume system receive 4250 J of heat. If the gas was initially at 293 K, what is the final temperature of the neon?

A heat pump extracts 7.0 × 106 J of heat per hour from a well at 280 K and delivers its output heat into a house at 320 K. If the heat pump uses an ideal Carnot cycle in its operation, what minimum work must be supplied to the heat pump per hour?

Two moles of an ideal gas have an initial Kelvin temperature Ti and absolute pressure Pi. The gas undergoes a reversible isothermal compression from an initial volume Vi to a final volume 0.5Vi. -How much heat is exchanged with the environment? If heat is exchanged, is it absorbed or released?

A heat engine operates between a hot reservoir at 1500 K and a cold reservoir at 500 K. During each cycle, 1.0 × 105 J of heat is removed from the hot reservoir and 5.0 × 104 J of work is performed. -Determine the change in entropy of the cold reservoir.

Which of the following samples exhibits the highest degree of entropy?

An ideal monatomic gas originally in state A is taken reversibly to state B along the straight-line path shown in the pressure-volume graph. -What is the change in the internal energy, in calories, of the gas for this process?

A heat engine operates in a Carnot cycle between reservoirs of temperatures 1000 K and 400 K. It is found to discharge 20 J of heat per cycle to the cold reservoir. What is the work output per cycle?

A fixed amount of ideal gas is compressed isothermally. Which entry in the table below correctly depicts the sign of the work done, the change in the internal energy, and the heat exchanged with the environment? work done change in internal energy heat exchanged

Introduction and Mathematical Concepts

Kinematics in One Dimension

Kinematics in Two Dimensions

Forces and Newtons Laws of Motion

Dynamics of Uniform Circular Motion

Work and Energy

Impulse and Momentum

Rotational Kinematics

Rotational Dynamics

Simple Harmonic Motion and Elasticity

Fluids

Temperature and Heat

The Transfer of Heat

The Ideal Gas Law and Kinetic Theory

Waves and Sound

The Principle of Linear Superposition and Interference Phenomena

Electric Forces and Electric Fields

Electric Potential Energy and the Electric Potential

Electric Circuits

Magnetic Forces and Magnetic Fields

Electromagnetic Induction

Alternating Current Circuits

Electromagnetic Waves

The Refl Ection of Light: Mirrors

The Refraction of Light: Lenses and Optical Instruments

Interference and the Wave Nature of Light

Special Relativity

Particles and Waves

The Nature of the Atom

Nuclear Physics and Radioactivity

Ionizing Radiation, Nuclear Energy, and Elementary Particles

Filters

A system containing an ideal gas at a constant pressure of 1.42 × 10⁵ Pa gains 2320 J of heat. During the process, the internal energy of the system increases by 2540 J. What is the change in volume of the gas?

Determine the quantity of heat added to 2.8 moles of the ideal gas argon if the temperature increases from 75 °C to 225 °C during an isobaric process. Note: The molar specific heats of argon are C_V = 3.0 cal/K·mol and C_P = 5.0 cal/K·mol.

A 1.00-kg sample of steam at 100.0 °C condenses to water at 100.0 °C. What is the entropy change of the sample if the heat of vaporization of water is 2.26 × 10⁶J/kg?

Which one of the following statements is true concerning the ratio of the molar heat capacities C_p/C_vfor an ideal gas?

A heat pump extracts 7.0 × 10⁶ J of heat per hour from a well at 280 K and delivers its output heat into a house at 320 K. If the heat pump uses an ideal Carnot cycle in its operation, what minimum work must be supplied to the heat pump per hour?

A heat engine operates between a hot reservoir at 1500 K and a cold reservoir at 500 K. During each cycle, 1.0 × 10⁵ J of heat is removed from the hot reservoir and 5.0 × 10⁴ J of work is performed. -Determine the change in entropy of the cold reservoir.