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A heat engine uses heat to do 50 J of work, and then exhausts 100 J of energy into a cold reservoir. The heat added to t

A heat engine uses heat to do 50 J of work, and then exhausts 100 J of energy into a cold reservoir. The heat added to the engine is 0 J 2 J 50 J 100 J 150 J.

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A heat engine uses heat to do 50 J of work, and then exhausts 100 J of energy into a cold reservoir. The heat added to t

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  1. A heat engine uses heat to do 50 J of work, and then exhausts 100 J of energy into a cold reservoir. The heat added to the engine is • 0 J • 2 J • 50 J • 100 J • 150 J

  2. A heat engine uses heat to do 50 J of work, and then exhausts 100 J of energy into a cold reservoir. The efficiency of the heat engine is • 25% • 33% • 50% • 75% • 100%

  3. Energy transferred as heat always moves from an object • At low kinetic energy to an object at high kinetic energy. • With high heat to an object with low heat. • At high temperature to an object at low temperature. • At low temperature to an object at high temperature.

  4. A heat pump warms a house by absorbing 90 joules of heat and doing 60 joules of work on the pump. The heat delivered to the house is • 10 J • 20 J • 30 J • 150 J • 5400 J

  5. A system has 60 J of heat added to it, resulting in 15 J of work being done by the system, and exhausting the remaining 45 J of heat. What is the efficiency of this process? • 15% • 25 % • 45% • 60% • 100 %

  6. A machine performs 90 J of work in lifting an object. The machine takes in 120 J of work to lift it. How much heat is created by the machine? (Enter a # with CPS)

  7. A machine performs 90 J of work in lifting an object. The machine takes in 120 J of work to lift it. What is the efficiency of the machine? (Enter a % with CPS)

  8. A student turns a crank which rotates a paddle wheel inside an insulated container of water. The student measures the change in temperature of the water and the work she has done in turning the crank. This experiment best illustrates the • Relationship between the average kinetic energy of the molecules of the water and the absolute temperature • Latent heat of fusion of water • Mechanical equivalent of heat • Thermal conductivity of water • Latent heat of vaporization of the water

  9. Which of the following best illustrates the second law of thermodynamics? • An air conditioning unit cools a house in the summer • A piston in a cylinder is pushed by expanding gas in the cylinder • Your bedroom gets cleaner as the week progresses • A tadpole grows into a frog • Cards thrown from the top of a stairway land in a stack in numerical order

  10. The law of entropy states that • Heat always flows spontaneously from a colder body to a hotter one • Every natural system will tend toward lower entropy • Heat lost by one object must be gained by another • The specific heat of a substance cannot exceed a certain value • Every natural system will tend toward disorder

  11. An ideal gas in enclosed in a container which has a fixed volume. If the temperature of the gas is increased, which of the following will also increase? • The pressure against the walls of the container • The average kinetic energy of the gas molecules • The number of moles of gas in the container • I only • I and II only • II and III only • II only • III only

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