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## Homework Statement

## Homework Equations

## The Attempt at a Solution

I understand the solution of the problem, but I want to know why don't my approach work.

I didn't change the frame of reference.

I use the regular method of solving a torque problem.

(mgsinθ - mAcosθ)(L/2) = mL

^{2}/3 θ''

which is approximately equal to

gθ-A = 2/3 L θ''

by solving differential equations, I got a frequency of Root (3/2 * g/L) , why am I wrong? Thank you (Also, isn't the moment of inertia of a rod 1/3 * mL^2 with respect to the rod?)