Physics q 15

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  1. Order in one part of the universe can only be produced at the expense of
    disorder in another part.
  2. Which has the larger entropy: #1-a gas that occupies only half of a container, with the other half a vacuum; or #2-the same gas occupying the entire container.
  3. The internal energy of a given amount of ideal gas depends only on
    its temperature.
  4. What is the maximum efficiency of an engine operating between 500K and 300 K?
    40 percent
  5. The rate at which an object radiates energy is proportional to the square of the absolute temperature.
  6. When a system goes from state 1 to state 2, the work done on the system is the same for all processes.
  7. The Second Law of Thermodynamics states that
    • we cannot get as much out
    • of a process as we put in.
  8. What happens to the temperature of an insulated room when a refrigerator in the middle of the room is plugged in and left running with its door open?
  9. When compared to a Carnot engine operating between the same two temperatures, real engines are
    less efficient
  10. Three engines operate between reservoirs separated in temperature by 200 K. The reservoir temperatures are:
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Physics q 15
physics q 15
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