Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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

    User Avatar
    Homework Helper
    Gold Member

    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.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook