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[QUOTE="SteamKing, post: 4966705, member: 301881"] It often helps to know some definitions when trying to teach yourself a subject: [url]http://en.wikipedia.org/wiki/Radius_of_gyration[/url] Insofar as a connection between the gyradius and the parallel axis theorem, there is only an indirect one. The PAT is used to calculate the MOI about a different set of axes, given an inertia value about an axis which is parallel. For example, when calculating the MOI of a composite area or mass, we usually want the MOI about the centroid of the combined area or mass. The PAT allows us to make this calculation, using the area or mass, the location of the centroid of each part, and the MOIs of the individual parts. The gyradius, on the other hand, gives a rough measure of the distribution of mass or area about an axis. A larger gyradius implies that the area or mass is distribued further away from the axis. The gyradius would typically be calculated for a composite area or mass after its MOI about the centroid had been determined. [/QUOTE]
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