Pendulum-why is this wrong?? 1. The problem statement, all variables and given/known data A 14 cm long 230 g rod is pivoted at one end. A 17 g ball of clay is stuck on the other end. What is the period if the rod and ball swing as a pendulum? 2. Relevant equations T= 2pi*sqrt(L/g) 3. The attempt at a solution I used the above equation T=2pi*sqrt(.14m/9.80) T=.75 s which is wrong I thought that the period of a pendulum didn't depend on mass, so why is this different?