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Pendulum solution not working

  1. Feb 6, 2012 #1
    Can someone explain how they got the term with the red box
    I understand the kl/2 but not the sin and cos part

    **Question** Consider the inverted pedulum connected to two equal springs both with constant k. Springs are undelfected when the mass is in the verticle position. If the rod is of length l and the spring are connected at l/2 find the equation of motion.

    http://img442.imageshack.us/img442/4896/24111q.jpg [Broken]
     
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Feb 6, 2012 #2

    PeterO

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    If that picture represents the total problem as presented, then there is no solution, as no question is asked?
     
    Last edited by a moderator: May 5, 2017
  4. Feb 7, 2012 #3
    Sorry I was on my phone and forgot the question I edited my orginal post
     
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