Exam 15: Thermodynamics

A friend tells you that he knows of a situation in heat passed from one body in thermal contact with another body whose temperature was higher than that of the first.He explains that he thinks the 2^nd law of thermodynamics must have been violated.Is he correct?

(Multiple Choice)

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(85)

Question 21

A system performs 800 J of work while taking in 500 J of heat.What is the change in internal energy of the system?

(Multiple Choice)

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(67)

Question 22

A refrigerator extracts 65 J of heat from a heat reservoir at 0.00 $^{\circ}$ C.If the coefficient of performance of the refrigerator is 2.5,then how much work is needed to run the refrigerator?

(Multiple Choice)

4.7/5

(69)

Question 23

Four coins,each with a Head and a Tail,are tossed randomly on to a table.The microstate is defined as the "number of Heads showing".The number of Heads can be,0,1,2,3,4.What value for the "number of Heads showing" has the greatest number of microstates?

(Multiple Choice)

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(79)

Question 24

A heat pump uses 100 J of work to output 150 J of heat at some temperature.What is the heat that is withdrawn from some lower temperature?

(Multiple Choice)

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Question 25

When water freezes,the entropy of the water

(Multiple Choice)

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Question 26

A heat pump is used to heat a house in Minnesota in the winter and has half the ideal coefficient of performance for a reversible heat pump.If the outside air temperature is -15 $^{\circ}$ C and the indoor temperature desired is 20 $^{\circ}$ C,and if it can do work at a rate of 1250 W,what is the rate of heat flow into the house?

(Multiple Choice)

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Question 27

A refrigerator uses 40.0 J of work to extract heat from a heat reservoir at 0.00 $^{\circ}$ C.If the coefficient of performance of the refrigerator is 2.10,then how much heat is discharged out of the refrigerator at a higher temperature?

(Multiple Choice)

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Question 28

A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into the room per cycle.How much work is required in each cycle?

(Multiple Choice)

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(67)

Question 29

Two coins,each with a Head and a Tail,are tossed randomly onto a table.The microstate is defined as the "number of Heads showing".The number of Heads can be,0,1,2.What value for the "number of Heads showing" has the greatest number of microstates?

(Multiple Choice)

4.7/5

(75)

Question 30

A heat pump uses 100 J of work output heat at some temperature.If the heat pump withdraws 60 J of heat from some lower temperature,then what is the coefficient of performance for the heat pump?

(Multiple Choice)

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(75)

Question 31

When an ideal gas is compressed isothermally:

(Multiple Choice)

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Question 32

An engine takes in 150 J energy from a 400 K thermal source.If the engine discharges energy into a thermal reservoir at 150K,then what is the maximum amount of work one can get out of the engine?

(Multiple Choice)

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(89)

Question 33

During an isothermal process,5.0 J of heat is removed from an ideal gas.What is the work done in the process?

(Multiple Choice)

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Question 34

A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into the room per cycle.What is the coefficient of performance?

(Multiple Choice)

5.0/5

(75)

Question 35

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.What is the change of volume of the gas in this process?

(Multiple Choice)

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(73)

Question 36

A engine goes through a cyclic process.During the cyclic process the engine takes in 3200 J of heat and has a heat output of 2400 J.What is the efficiency of the engine?

(Multiple Choice)

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(93)

Question 37

A refrigerator uses 40 J of work to extract heat from a heat reservoir at 0.00 $^{\circ}$ C.If the coefficient of performance of the refrigerator is 2.1,then how much heat is extracted from the heat reservoir at 0.00 $^{\circ}$ C?

(Multiple Choice)

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(87)

Question 38

For a system undergoing an adiabatic process,

(Multiple Choice)

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Question 39

100 coins,each with a Head and a Tail,are tossed randomly onto a table.A microstate is defined as the number of Heads that appear after the toss.What is the value for the number of Heads that has the most number of microstates?

(Multiple Choice)

4.7/5

(74)

Question 40

Showing 21 - 40 of 81

Exam 15: Thermodynamics

A friend tells you that he knows of a situation in heat passed from one body in thermal contact with another body whose temperature was higher than that of the first.He explains that he thinks the 2nd law of thermodynamics must have been violated.Is he correct?

A system performs 800 J of work while taking in 500 J of heat.What is the change in internal energy of the system?

A refrigerator extracts 65 J of heat from a heat reservoir at 0.00 ∘^{\circ}∘ C.If the coefficient of performance of the refrigerator is 2.5,then how much work is needed to run the refrigerator?

Four coins,each with a Head and a Tail,are tossed randomly on to a table.The microstate is defined as the "number of Heads showing".The number of Heads can be,0,1,2,3,4.What value for the "number of Heads showing" has the greatest number of microstates?

A heat pump uses 100 J of work to output 150 J of heat at some temperature.What is the heat that is withdrawn from some lower temperature?

When water freezes,the entropy of the water

A refrigerator uses 40.0 J of work to extract heat from a heat reservoir at 0.00 ∘^{\circ}∘ C.If the coefficient of performance of the refrigerator is 2.10,then how much heat is discharged out of the refrigerator at a higher temperature?

A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into the room per cycle.How much work is required in each cycle?

Two coins,each with a Head and a Tail,are tossed randomly onto a table.The microstate is defined as the "number of Heads showing".The number of Heads can be,0,1,2.What value for the "number of Heads showing" has the greatest number of microstates?

A heat pump uses 100 J of work output heat at some temperature.If the heat pump withdraws 60 J of heat from some lower temperature,then what is the coefficient of performance for the heat pump?

When an ideal gas is compressed isothermally:

An engine takes in 150 J energy from a 400 K thermal source.If the engine discharges energy into a thermal reservoir at 150K,then what is the maximum amount of work one can get out of the engine?

During an isothermal process,5.0 J of heat is removed from an ideal gas.What is the work done in the process?

A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into the room per cycle.What is the coefficient of performance?

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.What is the change of volume of the gas in this process?

A engine goes through a cyclic process.During the cyclic process the engine takes in 3200 J of heat and has a heat output of 2400 J.What is the efficiency of the engine?

A refrigerator uses 40 J of work to extract heat from a heat reservoir at 0.00 ∘^{\circ}∘ C.If the coefficient of performance of the refrigerator is 2.1,then how much heat is extracted from the heat reservoir at 0.00 ∘^{\circ}∘ C?

For a system undergoing an adiabatic process,

100 coins,each with a Head and a Tail,are tossed randomly onto a table.A microstate is defined as the number of Heads that appear after the toss.What is the value for the number of Heads that has the most number of microstates?

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Acceleration and Newtons Second Law of Motion

Motion With Constant Acceleration

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Temperature and the Ideal Gas

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A friend tells you that he knows of a situation in heat passed from one body in thermal contact with another body whose temperature was higher than that of the first.He explains that he thinks the 2^nd law of thermodynamics must have been violated.Is he correct?

A refrigerator extracts 65 J of heat from a heat reservoir at 0.00 $^{\circ}$ C.If the coefficient of performance of the refrigerator is 2.5,then how much work is needed to run the refrigerator?

A refrigerator uses 40.0 J of work to extract heat from a heat reservoir at 0.00 $^{\circ}$ C.If the coefficient of performance of the refrigerator is 2.10,then how much heat is discharged out of the refrigerator at a higher temperature?

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.What is the change of volume of the gas in this process?

A refrigerator uses 40 J of work to extract heat from a heat reservoir at 0.00 $^{\circ}$ C.If the coefficient of performance of the refrigerator is 2.1,then how much heat is extracted from the heat reservoir at 0.00 $^{\circ}$ C?