1. The problem statement, all variables and given/known data A holiday ornament in the shape of a hollow sphere with mass 2.0×10−2 kg and radius 5.5×10−2 m is hung from a tree limb by a small loop of wire attached to the surface of the sphere. If the ornament is displaced a small distance and released, it swings back and forth as a physical pendulum. Calculate its period. (You can ignore friction at the pivot. The moment of inertia of the sphere about the pivot at the tree limb is 5MR^2/3.) Take the free fall acceleration to be 9.80 2. Relevant equations T = 2pi(square root of (I/mgd)) I = (5MR^2)/(3) 3. The attempt at a solution[/b First of all, I used the moment of inertia they gave me in the problem in the equation. I don't know if that is ok or am i supposed to use the moment of inertia for a hollow sphere equation. Also, the distance, I do not have, so what would I do with that. I was using L/2 and assuming L was the radius but I don't know if that is ok. Could I use the parallel axis theorem? If someone could tell me or guide me in the right path I would appreciate it. Thanks.