What is the entropy change when 4 kg of water at 0S1U1P1$\circ$S1S1P0C is frozen into 4 kg of ice at 0S1U1P1$\circ$S1S1P0C?

A) 4.9 kJ/K B) an infinite change C) -4.9 kJ/K D) 1340 kJ/K E) -33 kJ/K A) 4.9 kJ/K B) an infinite change C) -4.9 kJ/K D) 1340 kJ/K E) -33 kJ/K

We wish to increase the efficiency of an ideal heat engine from 25% to 35%.If the initial temperature of the hot reservoir is 650S1U1P1$\circ$S1S1P0C,to what temperature would this need to be increased assuming the exhaust temperature remains the same?

A) 1065S1U1P1$\circ$S1S1P0C B) 910S1U1P1$\circ$S1S1P0C C) 1019S1U1P1$\circ$S1S1P0C D) 973S1U1P1$\circ$S1S1P0C E) 792S1U1P1$\circ$S1S1P0C A) 1065S1U1P1$\circ$S1S1P0C B) 910S1U1P1$\circ$S1S1P0C C) 1019S1U1P1$\circ$S1S1P0C D) 973S1U1P1$\circ$S1S1P0C E) 792S1U1P1$\circ$S1S1P0C

A heat pump needs to supply 20 kW of power to maintain the inside temperature of a house at 25S1U1P1$\circ$S1S1P0C while the outside temperature is 0S1U1P1$\circ$S1S1P0C.What is the power needed for the heat pump?

A) 3.36 kW B) 2.42 kW C) 2.78 kW D) 4.12 kW E) 1.68 kW A) 3.36 kW B) 2.42 kW C) 2.78 kW D) 4.12 kW E) 1.68 kW

Exam 19: The Second Law of Thermodynamics

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A quantity of heat is removed from a hot reservoir at absolute temperature T and then is added to a cold reservoir at absolute temperature T/2.The cold reservoir experiences an entropy increase S.What is the change in the entropy of the universe?

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Question 21

One mole of an ideal gas undergoes a reversible isothermal expansion from a volume of 1 L to a volume of 2 L.The change in entropy of the gas in terms of the universal gas constant R is

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Question 22

A heat engine absorbs heat Q from a hot reservoir.The amount of work done by the engine

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Question 23

A steam engine with a boiler temperature of 227ºC and an exhaust temperature of 27ºC has a maximum efficiency of approximately

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Question 24

An ideal heat pump is used to pump head from the outside air at -5ºC to the hot-air supply for the heating fan in a house,which is at 35ºC.How much work is required to pump 1.5 kJ of heat into the house?

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Question 25

The Carnot efficiency for a heat engine operating between the temperatures of 227º C and 27ºC is

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Question 26

A thermodynamic system is taken in equilibrium steps from State I to State II.The quantities by which the process can be characterized are Of these quantities,those that are independent of path are

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Question 27

A block of mass m = 0.2 kg slides across a rough horizontal surface with coefficient of kinetic friction $\mu$ _k = 0.5.What is the change in entropy after the block has moved a distance of 1 m? The temperature of the block and surrounding is 22^$\circ$C.

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Question 28

A car of mass 2000 kg is traveling at 22.0 m/s on a day when the temperature is 20.0ºC.The driver steps on the brakes and stops the car.By how much does the entropy of the universe increase?

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Question 29

A refrigerator has a coefficient of performance 5.0.How much heat is exhausted to the hot reservoir when 200 kJ of heat are removed from the cold reservoir?

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Question 30

What is the maximum possible coefficient of performance of a heat pump that is capable of maintaining the interior of a house at 23ºC when the temperature outside is -30ºC?

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Question 31

A heat pump with COP = 5 uses electrical energy W to heat a house.How much heat is pumped into the house?

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Question 32

A box contains 10 red and 10 white marbles.The box is then given a good shake.What is the probability that all the 10 red marbles will be at the bottom of the box?

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Question 33

What is the entropy change when 4 kg of water at 0^$\circ$C is frozen into 4 kg of ice at 0^$\circ$C?

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Question 34

What is the maximum possible efficiency of a steam engine operating between a high and low temperature of 550^$\circ$C and 180^$\circ$C?

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Question 35

When you make ice cubes,the entropy of the water

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Question 36

In a nuclear power plant,heat is taken from the reactor core at 300ºC,work is done to drive an electric generator,and heat is rejected to the environment at 40ºC.What is the maximum possible thermal efficiency of this system?

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Question 37

The diagram below is a schematic of a heat engine.The three quantities,Q_H,Q_L_, and W are represented,respectively,by

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Question 38

We wish to increase the efficiency of an ideal heat engine from 25% to 35%.If the initial temperature of the hot reservoir is 650^$\circ$C,to what temperature would this need to be increased assuming the exhaust temperature remains the same?

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Question 39

A heat pump needs to supply 20 kW of power to maintain the inside temperature of a house at 25^$\circ$C while the outside temperature is 0^$\circ$C.What is the power needed for the heat pump?

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Question 40

Showing 21 - 40 of 59

Exam 19: The Second Law of Thermodynamics

A quantity of heat is removed from a hot reservoir at absolute temperature T and then is added to a cold reservoir at absolute temperature T/2.The cold reservoir experiences an entropy increase S.What is the change in the entropy of the universe?

One mole of an ideal gas undergoes a reversible isothermal expansion from a volume of 1 L to a volume of 2 L.The change in entropy of the gas in terms of the universal gas constant R is

A heat engine absorbs heat Q from a hot reservoir.The amount of work done by the engine

A steam engine with a boiler temperature of 227ºC and an exhaust temperature of 27ºC has a maximum efficiency of approximately

An ideal heat pump is used to pump head from the outside air at -5ºC to the hot-air supply for the heating fan in a house,which is at 35ºC.How much work is required to pump 1.5 kJ of heat into the house?

The Carnot efficiency for a heat engine operating between the temperatures of 227º C and 27ºC is

A thermodynamic system is taken in equilibrium steps from State I to State II.The quantities by which the process can be characterized are Of these quantities,those that are independent of path are

A block of mass m = 0.2 kg slides across a rough horizontal surface with coefficient of kinetic friction μ\muμ k = 0.5.What is the change in entropy after the block has moved a distance of 1 m? The temperature of the block and surrounding is 22 ∘\circ∘ C.

A car of mass 2000 kg is traveling at 22.0 m/s on a day when the temperature is 20.0ºC.The driver steps on the brakes and stops the car.By how much does the entropy of the universe increase?

A refrigerator has a coefficient of performance 5.0.How much heat is exhausted to the hot reservoir when 200 kJ of heat are removed from the cold reservoir?

What is the maximum possible coefficient of performance of a heat pump that is capable of maintaining the interior of a house at 23ºC when the temperature outside is -30ºC?

A heat pump with COP = 5 uses electrical energy W to heat a house.How much heat is pumped into the house?

A box contains 10 red and 10 white marbles.The box is then given a good shake.What is the probability that all the 10 red marbles will be at the bottom of the box?

What is the entropy change when 4 kg of water at 0 ∘\circ∘ C is frozen into 4 kg of ice at 0 ∘\circ∘ C?

What is the maximum possible efficiency of a steam engine operating between a high and low temperature of 550 ∘\circ∘ C and 180 ∘\circ∘ C?

When you make ice cubes,the entropy of the water

In a nuclear power plant,heat is taken from the reactor core at 300ºC,work is done to drive an electric generator,and heat is rejected to the environment at 40ºC.What is the maximum possible thermal efficiency of this system?

The diagram below is a schematic of a heat engine.The three quantities,QH,QL, and W are represented,respectively,by

We wish to increase the efficiency of an ideal heat engine from 25% to 35%.If the initial temperature of the hot reservoir is 650 ∘\circ∘ C,to what temperature would this need to be increased assuming the exhaust temperature remains the same?

A heat pump needs to supply 20 kW of power to maintain the inside temperature of a house at 25 ∘\circ∘ C while the outside temperature is 0 ∘\circ∘ C.What is the power needed for the heat pump?

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A block of mass m = 0.2 kg slides across a rough horizontal surface with coefficient of kinetic friction $\mu$ _k = 0.5.What is the change in entropy after the block has moved a distance of 1 m? The temperature of the block and surrounding is 22^$\circ$C.

What is the entropy change when 4 kg of water at 0^$\circ$C is frozen into 4 kg of ice at 0^$\circ$C?

What is the maximum possible efficiency of a steam engine operating between a high and low temperature of 550^$\circ$C and 180^$\circ$C?

The diagram below is a schematic of a heat engine.The three quantities,Q_H,Q_L_, and W are represented,respectively,by

We wish to increase the efficiency of an ideal heat engine from 25% to 35%.If the initial temperature of the hot reservoir is 650^$\circ$C,to what temperature would this need to be increased assuming the exhaust temperature remains the same?

A heat pump needs to supply 20 kW of power to maintain the inside temperature of a house at 25^$\circ$C while the outside temperature is 0^$\circ$C.What is the power needed for the heat pump?