Question: what is the physical significance of mi?
Answer: prasanna August 19, 2016, 10:58am #1. (a) The inability of a body to change its state of uniform rotation about an axis is called rotational inertia or M.I. of the body. Vi. It plays the same role in rotatory motion as is being played by the mass in translational motion, i.e., it is rotational analogue of mass.