Routh's Rule -- from Eric Weisstein's World of Physics

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Routh's Rule

The principal moments of inertia for the "simple" bodies in the following table can be given by

where is the sum of squares of the semimajor axes Eric Weisstein's World of Math of the other principal moments and n is a small positive integer.

n body

3 rectangular parallelepiped

Principal Moments of Inertia

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