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Homework Statement
A uniform circular disk whose radius R is 40.0 cm is suspended as a physical pendulum from a point on its rim.
(a) What is its period of oscillation?
(b) At what radial distance r < R is there a point of suspension that gives the same period?
R = .40 m
g = 9.81 m/s^2
h = .40m
Homework Equations
T = 2pi(I/(mgh))^.5
I = .25mR^2
The Attempt at a Solution
I don't understand why R is .40 m but h isn't. I arrived at a solution of .63 s, but the actual solution is 1.55 s.