Are the parallel and perpendicular axes theorem for determination of moment of inertia valid only for bodies of uniform mass density?
1 Answer
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No. These theorems apply for any mass distribution - continuous, discrete, uniform density, non-uniform density. See derivations in wikipedia for parallel and perpendicular theorems. Note that density does not enter into the derivation, and no assumption of uniform mass distribution is made.
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$\begingroup$ I read Parallel axis theorem non-uniform density and intially answered that question by mistake! $\endgroup$ Oct 8, 2016 at 17:25