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Homework Help: A few easy conceptual questions

  1. Apr 15, 2009 #1
    1. The problem statement, all variables and given/known data
    Here are a couple of conceptual questions from my cumulative review.

    1. Is energy released or absorbed when a gas changes to a liquid?

    2. If a yo-yo is being whirled around by its string in a vertical circle, does the string apply an outward force or an inward force?

    2. Relevant equations

    3. The attempt at a solution
    I think that energy is released when a gas changes to a liquid, and I believe that the string is applying an inward force.
  2. jcsd
  3. Apr 15, 2009 #2


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    Science Advisor
    Homework Helper
    Gold Member

    Looks good to me. To indicate that you didn't just flip a coin to get these, it would be good to say something about the internal energy of a gas vs. a liquid (in the first case) and about force and acceleration (in the second case).
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