Exam 15: Thermodynamics

If 1.00 mol of oxygen is heated at constant pressure of 1.00 atm from 10.0 $^{\circ}$ C to 25.0 $^{\circ}$ C.From the first law,calculate the change of internal energy of the gas in this process.

(Multiple Choice)

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Question 61

A heat pump uses 200 J of work to output 300 J of heat into a heat reservoir at 200 K.What is the coefficient of performance for the heat pump?

(Multiple Choice)

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Question 62

If 1.00 mol of oxygen is heated at constant pressure of 1.00 atm from 10.0 $^{\circ}$ C to 25.0 $^{\circ}$ C.How much heat is absorbed by the gas?

(Multiple Choice)

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Question 63

During an isothermal process,5.0 J of heat is removed from an ideal gas.What is the change in internal energy?

(Multiple Choice)

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Question 64

An refrigerator keeps food in the freezer portion at -15 $^{\circ}$ C and dumps excess heat into the kitchen,whose temperature is 22 $^{\circ}$ C.If the refrigerator has half the coefficient of performance of an ideal reversible refrigerator,and if its motor can supply 250W of power,what is the rate of heat flow into the kitchen?

(Multiple Choice)

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Question 65

A heat pump takes in 60.0 J of energy from a 250 K thermal reservoir outside a house and discharges heat energy into a 350 K thermal reservoir inside a house.What is the minimum amount of work needed to make the pump work?

(Multiple Choice)

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Question 66

A refrigerator extracts 65.0 J of heat from a heat reservoir at 0.00 $^{\circ}$ C.If the coefficient of performance of the refrigerator is 2.50,then how much heat is discharged out of the refrigerator?

(Multiple Choice)

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Question 67

In the first law of thermodynamics ( $\Delta$ U = Q + W),the variables Q and W stand for

(Multiple Choice)

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Question 68

10 joules of heat energy are transferred to a sample of ideal gas at constant volume.As a result,the internal energy of the gas

(Multiple Choice)

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Question 69

For a system undergoing an isothermal process,

(Multiple Choice)

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Question 70

2.00 moles of an ideal gas freely expands from 1.50 liters to 4.00 liters.The change in entropy in the expansion is

(Multiple Choice)

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Question 71

According to the second law of thermodynamics,for any process that may occur within an isolated system,which answer applies?

(Multiple Choice)

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Question 72

A kilogram of water (c = 4.186 kJ/kg $^{\circ}$ C)is stirred using a 400 watt device for 5 minutes.At the end of this time the temperature of the water has increased by 15 $^{\circ}$ C.How much heat was lost to the surroundings?

(Multiple Choice)

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Question 73

What physical quantity is represented by the area under a curve on a PV diagram where pressure is in Pa and V is in m³?

(Multiple Choice)

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Question 74

If 50 kJ of heat flows into a system and 35 kJ of work is done by the system,then what is the change in internal energy?

(Multiple Choice)

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Question 75

The internal energy of a system increases by 500 J while 610 J of work are performed on it.What was the heat flow into or out of the system?

(Multiple Choice)

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Question 76

One mole of an ideal gas freely expands from 1.00 liter to 2.00 liters.The change in entropy in the expansion is

(Multiple Choice)

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Question 77

A heat engine has an efficiency of 35.0% and its power output is 600 W.What is the rate of heat input?

(Multiple Choice)

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Question 78

A system in a certain macro state has 2 $\times$ 10²³ microstates.Through some process,the system changes the number of microstates to 3 $\times$ 10²³.What is the change in entropy for the process?

(Multiple Choice)

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Question 79

A friend tells you that he knows of a situation in which bowl of ice sitting by itself on a table in a room whose air temperature is 20 $^{\circ}$ C gives up heat the surrounding air.What's wrong with this concept?

(Multiple Choice)

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Question 80

Showing 61 - 80 of 81

Exam 15: Thermodynamics

If 1.00 mol of oxygen is heated at constant pressure of 1.00 atm from 10.0 ∘^{\circ}∘ C to 25.0 ∘^{\circ}∘ C.From the first law,calculate the change of internal energy of the gas in this process.

A heat pump uses 200 J of work to output 300 J of heat into a heat reservoir at 200 K.What is the coefficient of performance for the heat pump?

If 1.00 mol of oxygen is heated at constant pressure of 1.00 atm from 10.0 ∘^{\circ}∘ C to 25.0 ∘^{\circ}∘ C.How much heat is absorbed by the gas?

During an isothermal process,5.0 J of heat is removed from an ideal gas.What is the change in internal energy?

A heat pump takes in 60.0 J of energy from a 250 K thermal reservoir outside a house and discharges heat energy into a 350 K thermal reservoir inside a house.What is the minimum amount of work needed to make the pump work?

A refrigerator extracts 65.0 J of heat from a heat reservoir at 0.00 ∘^{\circ}∘ C.If the coefficient of performance of the refrigerator is 2.50,then how much heat is discharged out of the refrigerator?

In the first law of thermodynamics ( Δ\DeltaΔ U = Q + W),the variables Q and W stand for

10 joules of heat energy are transferred to a sample of ideal gas at constant volume.As a result,the internal energy of the gas

For a system undergoing an isothermal process,

2.00 moles of an ideal gas freely expands from 1.50 liters to 4.00 liters.The change in entropy in the expansion is

According to the second law of thermodynamics,for any process that may occur within an isolated system,which answer applies?

A kilogram of water (c = 4.186 kJ/kg ∘^{\circ}∘ C)is stirred using a 400 watt device for 5 minutes.At the end of this time the temperature of the water has increased by 15 ∘^{\circ}∘ C.How much heat was lost to the surroundings?

What physical quantity is represented by the area under a curve on a PV diagram where pressure is in Pa and V is in m3?

If 50 kJ of heat flows into a system and 35 kJ of work is done by the system,then what is the change in internal energy?

The internal energy of a system increases by 500 J while 610 J of work are performed on it.What was the heat flow into or out of the system?

One mole of an ideal gas freely expands from 1.00 liter to 2.00 liters.The change in entropy in the expansion is

A heat engine has an efficiency of 35.0% and its power output is 600 W.What is the rate of heat input?

A system in a certain macro state has 2 ×\times× 1023 microstates.Through some process,the system changes the number of microstates to 3 ×\times× 1023.What is the change in entropy for the process?

A friend tells you that he knows of a situation in which bowl of ice sitting by itself on a table in a room whose air temperature is 20 ∘^{\circ}∘ C gives up heat the surrounding air.What's wrong with this concept?

Introduction

Force

Acceleration and Newtons Second Law of Motion

Motion With Constant Acceleration

Circular Motion

Conservation of Energy

Linear Momentum

Torque and Angular Momentum

Fluids

Elasticity and Oscillations

Waves

Sound

Temperature and the Ideal Gas

Heat

Electric Forces and Fields

Electric Potential

Electric Current and Circuits

Magnetic Forces and Fields

Electromagnetic Induction

Alternating Current

Electromagnetic Waves

Reflection and Refraction of Light

Optical Instruments

Interference and Diffraction

Relativity

Early Quantum Physics and the Photon

Quantum Physics

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If 1.00 mol of oxygen is heated at constant pressure of 1.00 atm from 10.0 $^{\circ}$ C to 25.0 $^{\circ}$ C.From the first law,calculate the change of internal energy of the gas in this process.

If 1.00 mol of oxygen is heated at constant pressure of 1.00 atm from 10.0 $^{\circ}$ C to 25.0 $^{\circ}$ C.How much heat is absorbed by the gas?

A refrigerator extracts 65.0 J of heat from a heat reservoir at 0.00 $^{\circ}$ C.If the coefficient of performance of the refrigerator is 2.50,then how much heat is discharged out of the refrigerator?

In the first law of thermodynamics ( $\Delta$ U = Q + W),the variables Q and W stand for

A kilogram of water (c = 4.186 kJ/kg $^{\circ}$ C)is stirred using a 400 watt device for 5 minutes.At the end of this time the temperature of the water has increased by 15 $^{\circ}$ C.How much heat was lost to the surroundings?

What physical quantity is represented by the area under a curve on a PV diagram where pressure is in Pa and V is in m³?

A system in a certain macro state has 2 $\times$ 10²³ microstates.Through some process,the system changes the number of microstates to 3 $\times$ 10²³.What is the change in entropy for the process?

A friend tells you that he knows of a situation in which bowl of ice sitting by itself on a table in a room whose air temperature is 20 $^{\circ}$ C gives up heat the surrounding air.What's wrong with this concept?