A sphere consists of a solid wooden ball of uniform density 800 kg/m3 and radius 0.30 m and is covered with a thin coating of lead foil with area density 20 kg/m2. Calculate the moment of inertia of this sphere about an axis passing through its center.

Solution 74P Step 1: 3 Density of wooden ball w 800 kg/m Density of the lead l= 20 kg/m 2 Radius r = 0.30 m