perpendicular axis theorem
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(physics) A theorem that states the moment of inertia of a planar lamina (i.e. 2-D body) about an axis perpendicular to the plane of the lamina is equal to the sum of the moments of inertia of the lamina about the two axes at right angles to each other, in its own plane intersecting each other at the point where the perpendicular axis passes through it.
perpendicular axis theorem
When calculating the moment of inertia of a thin metal disk, applying the perpendicular axis theorem simplifies the work by relating the out-of-plane moment to the sum of the in-plane moments.
When calculating the moment of inertia of a thin metal disk, applying the perpendicular axis theorem simplifies the work by relating the out-of-plane moment to the sum of the in-plane moments.
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