1. The problem statement, all variables and given/known data A gibbon, hanging onto a horizontal tree branch with one arm, swings with a small amplitude. The gibbon's center of mass is 0.410 m from the branch and its rotational inertia divided by its mass is I/m = 0.289 m2. Estimate the frequency of oscillation. 2. Relevant equations d = 1/2L T = 2π * SQRT(I/mgd) f = 1/T 3. The attempt at a solution Okay, they have given me I/m, and I need to find f using the last equation. In order to find T, I need to use the first and second equation. d = 1/2(.410) d = .205 I/m = .289 m2 T = 2π * SQRT([.289][9.8][.205]) T = 2π * .762 T = 4.78 f = 1/4.78 f = .209 Hz Which is, of course, wrong. I'm thinking I'm getting confused by the I/m = 0.289 m2 value which is throwing off how I plug and chug. I may even have the wrong equation. Thanks for all your help.