Simple pendulum Help. Dunno Why Im wrong.

[e=mcahhhh]

Homework Statement

A very light rigid rod with a length of 0.742 m extends straight out from one end of a meter stick. The combination is suspended from a pivot at the upper end of the rod as shown in the following figure. The combination is then pulled out by a small angle and released.

Homework Equations

Period T=2pi sqrt(L/g)

The Attempt at a Solution

T=2pi* sqrt (.743/9.8)=1.72s

http://www.webassign.net/serpse8/15-p-034-alt.gif

 

[ehild]

It is not a simple pendulum, I am afraid. A picture would be useful. You did not take the meter stick into account.

ehild

 

[e=mcahhhh]

Oh i see its a physical pendulum

 

[ehild]

Yes. Find the moment of inertia.

ehild