The moment of inertia is a tensor and the matrix contains nine elements. The off-diagonal elements are like Ixy, Ixz, Iyx and so on. Ixy = mxy. But M.I. = mass × (perpendicular distance of the particle from the axis)^2. So what does this x×y signify in the relation for Ixy?
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1Your definition of M.I. in terms of the square of the distance from an axis is a simplified definition that applies only to certain tensor components. It is not the full tensor definition. – G. Smith Jun 26 '19 at 05:12
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3Possible duplicate of What is the physical significance of the off-diagonal moment of inertia matrix elements? – John Rennie Jun 26 '19 at 05:14
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Also What's the physical significance of the off-diagonal element in the matrix of moment of inertia – John Rennie Jun 26 '19 at 05:14