A physical pendulum is composed a rod of length 28 cm and radius 2.9 cm suspended downward from one of its ends. At the bottom, free end, there is a large, circular bubble of the same radius as the rod so that it is wholly within the rod, but as far towards the bottom as possible. (a) If the rod has a density of 8.1 g/cm , what is its mass? (b) Find its center of mass if the rod is suspended at the origin 0. I'CM = x+ ly + 72 (c) Find its moment of inertia around the origin