Question 1

Oxygen condenses into a liquid at approximately 90 K. What temperature, in degrees Fahrenheit, does this correspond to?

Accepted Answer

A) -193°F 
B) -217°F 
C) -265°F 
D) -297°F 
A) -193°F 
B) -217°F 
C) -265°F 
D) -297°F

Question 2

At room temperature, a typical person loses energy to the surroundings at the rate of 62 W. If this energy loss has to be made up by an equivalent food intake, how many kilocalories (food calories)does this person need to consume every day just to make up this heat loss? (1 cal = 4.186 J)

Accepted Answer

A) 1000 kcal 
B) 1100 kcal 
C) 1300 kcal 
D) 1500 kcal 
E) 1600 kcal 
A) 1000 kcal 
B) 1100 kcal 
C) 1300 kcal 
D) 1500 kcal 
E) 1600 kcal

Question 3

Suppose that the Department of Energy develops a new reversible engine that has a coefficient of performance (COP)of 4.0 when operated as a refrigerator and a COP of 5.0 when operated as a heat pump. What is its thermal efficiency when operated as a heat engine doing work?

Accepted Answer

A) 10% 
B) 20% 
C) 25% 
D) 45% 
E) 80% 
A) 10% 
B) 20% 
C) 25% 
D) 45% 
E) 80%

Question 4

A cylinder contains 1.50 moles of an ideal monatomic gas that is initially at a temperature of 317 K. If the gas gains 2730 J of heat and performs 780 J of work, what is its final temperature? (R = 8.31 J/mol ∙ K)

Accepted Answer

A) 359 K 
B) 421 K 
C) 526 K 
D) 687 K 
E) 756 K 
A) 359 K 
B) 421 K 
C) 526 K 
D) 687 K 
E) 756 K

Question 5

During an isochoric process, the internal (thermal)energy of a gas decreases by 50 J. How much heat is added to the gas during this process?

Accepted Answer

A) 0 J 
B) 50 J 
C) -50 J 
D) 25 J 
E) -25 J 
A) 0 J 
B) 50 J 
C) -50 J 
D) 25 J 
E) -25 J

Question 6

A certain gas is compressed adiabatically. The amount of work done on the gas is 800 J. What is the change in the internal (thermal)energy of the gas?

Accepted Answer

A) 800 J 
B) -800 J 
C) 400 J 
D) 0 J 
E) More information is needed to answer this question. 
A) 800 J 
B) -800 J 
C) 400 J 
D) 0 J 
E) More information is needed to answer this question.

Oxygen condenses into a liquid at approximately 90 K. What temperature, in degrees Fahrenheit, does this correspond to?

At room temperature, a typical person loses energy to the surroundings at the rate of 62 W. If this energy loss has to be made up by an equivalent food intake, how many kilocalories (food calories)does this person need to consume every day just to make up this heat loss? (1 cal = 4.186 J)

Suppose that the Department of Energy develops a new reversible engine that has a coefficient of performance (COP)of 4.0 when operated as a refrigerator and a COP of 5.0 when operated as a heat pump. What is its thermal efficiency when operated as a heat engine doing work?

A cylinder contains 1.50 moles of an ideal monatomic gas that is initially at a temperature of 317 K. If the gas gains 2730 J of heat and performs 780 J of work, what is its final temperature? (R = 8.31 J/mol ∙ K)

During an isochoric process, the internal (thermal)energy of a gas decreases by 50 J. How much heat is added to the gas during this process?

A certain gas is compressed adiabatically. The amount of work done on the gas is 800 J. What is the change in the internal (thermal)energy of the gas?

Representing Motion

Motion in One Dimension

Vectors and Motion in Two Dimensions

Forces and Newtons Laws of Motion

Applying Newtons Laws

Gravity

Rotational Motion

Equilibrium Ad Elasticity

Momentum

Energy and Work

Thermal Properties of Matter

Fluids

Oscillations

Traveling Waves and Sound

Superposition and Standing Waves

Wave Optics

Ray Optics

Optical Instruments

Electric Fields and Forces

Electric Potential

Current and Resistance

Circuits

Magnetic Fields and Forces

Em Induction and Em Waves

Ac Electricity

Relativity

Quantum Physics

Atoms and Molecules

Nuclear Physics

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Exam 11: Using Energy

Oxygen condenses into a liquid at approximately 90 K. What temperature, in degrees Fahrenheit, does this correspond to?

At room temperature, a typical person loses energy to the surroundings at the rate of 62 W. If this energy loss has to be made up by an equivalent food intake, how many kilocalories (food calories)does this person need to consume every day just to make up this heat loss? (1 cal = 4.186 J)

Suppose that the Department of Energy develops a new reversible engine that has a coefficient of performance (COP)of 4.0 when operated as a refrigerator and a COP of 5.0 when operated as a heat pump. What is its thermal efficiency when operated as a heat engine doing work?

A cylinder contains 1.50 moles of an ideal monatomic gas that is initially at a temperature of 317 K. If the gas gains 2730 J of heat and performs 780 J of work, what is its final temperature? (R = 8.31 J/mol ∙ K)

During an isochoric process, the internal (thermal)energy of a gas decreases by 50 J. How much heat is added to the gas during this process?

A certain gas is compressed adiabatically. The amount of work done on the gas is 800 J. What is the change in the internal (thermal)energy of the gas?

Representing Motion

Motion in One Dimension

Vectors and Motion in Two Dimensions

Forces and Newtons Laws of Motion

Applying Newtons Laws

Gravity

Rotational Motion

Equilibrium Ad Elasticity

Momentum

Energy and Work

Thermal Properties of Matter

Fluids

Oscillations

Traveling Waves and Sound

Superposition and Standing Waves

Wave Optics

Ray Optics

Optical Instruments

Electric Fields and Forces

Electric Potential

Current and Resistance

Circuits

Magnetic Fields and Forces

Em Induction and Em Waves

Ac Electricity

Relativity

Quantum Physics

Atoms and Molecules

Nuclear Physics

Filters