Thermodynamics and Energy Flow Quiz
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Questions and Answers

What is entropy a measure of?

  • Temperature difference
  • Disorder (correct)
  • Amount of heat flowing into the cold body
  • Energy involved in the flow
  • Which of the following has low entropy?

  • Hot body
  • Ice (correct)
  • Steam
  • Liquid water
  • According to the Laws of Thermodynamics, what can never decrease in a total system?

  • Total system entropy (correct)
  • Temperature difference
  • Energy involved in the flow
  • Amount of heat flowing out of the hot body
  • In terms of entropy, what does steam have compared to ice?

    <p>More entropy</p> Signup and view all the answers

    What does the change in entropy of the cold body signify?

    <p>Change in disorder</p> Signup and view all the answers

    What must happen to the entropy in one part of a system if it decreases locally?

    <p>It must increase elsewhere by at least as much</p> Signup and view all the answers

    What happens to entropy as the temperature approaches zero?

    <p>Entropy decreases</p> Signup and view all the answers

    Which equation relates heat energy change and entropy change?

    <p>$\Delta Q = T \Delta S$</p> Signup and view all the answers

    How does adding heat affect entropy?

    <p>Increases entropy</p> Signup and view all the answers

    What is the concept of the 'total system' in relation to entropy change?

    <p>Entropy must increase elsewhere by at least as much</p> Signup and view all the answers

    What does the second law of thermodynamics impose a constraint on?

    <p>Total entropy</p> Signup and view all the answers

    In the context of heat transfer, what does ΔStot represent?

    <p>Total entropy change</p> Signup and view all the answers

    What must happen to the entropy of the sink when heat is added?

    <p>It must increase</p> Signup and view all the answers

    What does the inequality ΔQc ≥ (Tc/Th)ΔQh set a minimum on?

    <p>The heat delivered to the sink ΔQc</p> Signup and view all the answers

    What is the consequence of violating the second law of thermodynamics?

    <p>Entropy increase in the source</p> Signup and view all the answers

    Why can't the efficiency be 100% by sending no heat to the sink, according to the text?

    <p>Because it violates the second law of thermodynamics</p> Signup and view all the answers

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