Find frequency and period of oscillation

[gpat]

Homework Statement

Consider the pulley to be ideal. If the system disturbed from its equilibrium position by pulling the right hand mass down a slight amount and then released, determine the frequency and period of the oscillation. Radius of pulley is r=2m and I bar of the pulley is 10kg/m2.

here is the picture:
http://i26.tinypic.com/2hzu2yg.jpg


I got f=0.982hz and T=1.01s

Is that correct?

 

[jix]

Could you show how you got that?