Question

three identical rings each of mass m and radius r are kept in touch with each other such that their centres form an equilateral triangle.M.I. of the system about a median of triangle is

Answer 1

Answer:

The MI of first ring about this axis MR2/2+MR2=3MR2/2

The MI of second ring about this axis MR2/2+MR2=3MR2/2

The MI of third ring about this axis MR2/2

So, Total MI of system is 3MR2/2+3MR2/2+MR2/2=7MR2/2