Homework Help: Physical pendulum

1. Apr 20, 2012

Mdhiggenz

1. The problem statement, all variables and given/known data
Two pendulums have the same dimensions (length ) L and total mass (m). Pendulum A is a very small ball swinging at the end of a uniform massless bar. In pendulum B , half the mass is in the ball and half is in the uniform bar.

A. Find the period of pendulum A for small oscillations.

B. Find the period of pendulum B for small oscillation

2. Relevant equations

3. The attempt at a solution

For A. I got 2∏√L/g which is correct however i am struggling for B

What I did was

Pendulum B I= Ibar + Ibar= 1/3 (m/2)L^2+m/2L^2= 2/3mL^2

2. Apr 21, 2012

tiny-tim

Hi Mdhiggenz!

(try using the X2 button just above the Reply box )
Looks ok!