Apendulum is constructed from a thin, rigid, and uniform rod with a small sphere attached to the end opposite the pivot. this arrangement is a good approximation to a simple pendulum (period = 0.94 s), because the mass of the sphere (lead) is much greater than the mass of the rod (aluminum). when the sphere is removed, the pendulum is no longer a simple pendulum, but is then a physical pendulum. what is the period of the physical pendulum?