Three identical rings of masses m each and radius r are kept in contact as shown in Fig. Find the moment of inertia of the system about a common tangent.

Three identical rings of masses m each and radius r are kept in contac

1.	Three identical rings of masses m each and radius r are kept in contact as shown in Fig. Find the moment of inertia of the system about a common tangent.
Answer» Solution :M.I. of RING about a diameter `=MR^(2)//2`, About tangent `=3 XX [(mr^(2)//2) + mr^(2)] = 9mr^(2)//2`