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Mechanical properties of solids questions

  1. Oct 23, 2009 #1
    1. The problem statement, all variables and given/known data
    Intermolecular forces are
    1- Attractive only
    2-Repulsive only

    2. Relevant equations
    The 1st and 2nd options are not valid as the nature depends on the distance between the molecules.

    3. The attempt at a solution
    The answer given is short-range.How is that?Even,at infinity,the force does not become zero as even then,attractive forces should act.Or is it so,because intermolecular distances are measured on a very small scale and therefore,they are not valid for long distances?
  2. jcsd
  3. Oct 23, 2009 #2
    This is another question from the same topic.
    "In a solid,the kinetic energy of molecules is less than the magnitude of their potential energy."
    How did we come to this conclusion?I know it is true for an atom,but why do we say this for molecules of a solid too?
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