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Homework Help: Problem with Mordern Physic

  1. Aug 21, 2013 #1
    1. The problem statement, all variables and given/known data

    Consider a bar of length as measured in frame S. Show that the bar has the same length in
    frame Sā€™, that is, show that lengths are invariant under Galilean transformations.

    2. Relevant equations

    3. The attempt at a solution

    I know that t'=t


    The problem is that i dont understant how to make it valit with the equation, i undestant that the space from th point of view of S' dilates and is not invariant .
  2. jcsd
  3. Aug 21, 2013 #2
    skip to 12:40 on this video
    Last edited by a moderator: Sep 25, 2014
  4. Aug 21, 2013 #3
    Yep but how i show that the leght in that equation is invariant in galilean tranformation
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