Question

9. The flywheel shown in Figure 14.8 may be considered to be a steel

cylinder (density 7800 kg m−3) of outer radius 40 cm and depth 12 cm,
but with the central section (of outer radius 18 cm) missing.

a. Use this simplification to estimate its moment of inertia. Ignore the
supporting structure.

Answer 1

I have no idea. It sounds like you need to model it as two cyclinders, a full cylinder, minus a central cyclinder. If that is so, Itotal= I cylinder=I center