What is the frequency of small oscillations for a bar hanging on two cords?

[regisz90]

Homework Statement

A bar of length L is hanged by two cords(on the two edges of the bar) of length l in 1 pivot. What´s the frequency of small oscillations arond the stable position

Homework Equations

T=2\pi\sqrt{\Theta/mgd}

The Attempt at a Solution

I would try to solve it as a physics pendulum, but I am not sure that is it a physics pendulum, because its hanging on two cords, and before this there was always only 1 cord.

 

[rude man]

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.