Question

The figure below shows an arrangement of 15 identical disks that have been glued together in a rod-like shape of length L = 1.2500 m and (total) mass M = 120.000 g. The arrangement can rotate about a perpendicular axis through its central disk at point O.

Answer 1

I'll attach the picture. one sec.

Answer 2

Heres the questions. What is the rotational inertia of the arrangement about that axis?

Answer 3

I = sum m(i) r(i)^2

m(I) disk mass, r(i) distance from center.

brute force!