1. The problem statement, all variables and given/known data Does it matter whether you measure the length of the pendulum to the center of mass of the ball or to the bottom of the ball 2. Relevant equations T=2pi*root(L/g) 3. The attempt at a solution I can see that L (length) is a factor, but I'm not sure why it matters if it's taken from the COM or not?? Any help is appreciated!!