4-4. A
thin plate with a hole at its center is hanging at point O. The density of the material is 
and
the thickness is 
. Find the moment of inertia about the axis that passes through O, perpendicular to the page.
Solution: 
4-4. A
thin plate with a hole at its center is hanging at point O. The density of the material is and
the thickness is . Find the moment of inertia about the axis that passes through O, perpendicular to the page.
Solution: