A Christmas tree ball hangs from a hook in the ceiling.

[ScienceGeek24]

Homework Statement

A Christmas tree ball hangs from a hook in the ceiling. If the radius of the ball is 8 cm, find the period of the ball's oscillation as it swings on the hook.

Homework Equations

T=2pi*√L/g

The Attempt at a Solution

I tried pluggin the number and I'm way off the answer. Am i using the right equation?

 

[gneill]

A Christmas ball is not a point mass on the end of a string. The system comprises a Physical Pendulum (look it up).

 

[ScienceGeek24]

true true i got it! thanks! it was complicated.