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Bar hanging on 2 cords

  1. Apr 8, 2012 #1
    1. The problem statement, all variables and given/known data
    A bar of lenght L is hanged by two cords(on the two edges of the bar) of lenght l in 1 pivot. What´s the frequency of small oscillations arond the stable position


    2. Relevant equations
    T=2[itex]\pi[/itex][itex]\sqrt{\Theta/mgd}[/itex]


    3. The attempt at a solution
    I would try to solve it as a physics pendulum, but im not sure that is it a physics pendulum, because its hanging on two cords, and before this there was always only 1 cord.
     
  2. jcsd
  3. Apr 9, 2012 #2

    rude man

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    Displace the bar by a small amount and compute the restoring force f, making the usual small-angle assumption(s) for the angle θ between the vertical and a line drawn from the c.m. to the pivot. Then solve f(θ) = ma(θ) as usual.

    BTW the problem should also have given the lengths of the two supporting cords, or the distance from the bar's center to the pivot point.
     
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