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Is there any physical reason for this other than mathematical derivation ?
Thank you
Hollow Shaafts are stiffer than solid shafts of same materail because the polar moment of inertia of a hollow section can be much larger than the solid section of same area.Polar Moment:-The polar moment of inertia is used to calculate the angular displacement of an object subjected to a torque. It can be defined as a quantity that predicts an object''s ability to resist torsion, in objects with an invariant circular cross section and no significant warping or out-of-plane deformation.
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