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**Pendulum-why is this wrong??**

**1. Homework Statement**

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. Homework 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?