Saturday, 14 July 2018

torque - Parallel axis theorem non-uniform density



The parallel axis theorem says that if the moment of inertia of a body rotating about the body's centre of mass is $I_{cm}$, then the moment of inertia of the body rotating about an axis parallel to the original axis and displaced from it a distance $d$ is $I_{S}=I_{cm}+Md^2$, where $M$ is the body's mass.


I know for a fact that this applies in cases of uniform density. Does this same theorem apply if the body's density is not uniform?




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