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I need a real life application for finding moment of a inertia of a spinning rod.?

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1. The Moment of Inertia of Juggling Clubs Moment of Inertia The Moment of Inertia of some solid body is a measure of its tendancy to keep spinning around some axis, just as the Mass is a measure of its tendancy to keep moving in a straight line. Things can have high Mass but very low Moment of Inertia, if all the mass is concentrated really close to the axis of rotation; or, they can have low Mass and high Moment of Inertia, if most of the mass is situated a long way from the axis of rotation. However, for things of a given size and shape, the Moment of Inertia is proportional to the Mass. Jugglers are concerned with Moment of Inertia because they want to know how "fast-spinning" or "slow-spinning" a particular type of club is. I think it's fair to say that most people's "Ideal Juggling Club" would have a Moment of Inertia around .0045 Kilogram.Meter.Meters, but clubs between about .003 to .007 still remain juggleable. It seems strange to me, with all the discussion about fast-spinning and slow-spinning clubs, that no manufacturer bothers to quote the Moment of Inertia, even though they do specify the Mass. But juggling-club Moments of Inertia cover quite a wide range, and makers really should specify them, so that people know what kind of club they're ordering.