# 67 - Rotational mechanics Questions Answers

Dear Sir kindly help provide the correct approach and solution to solve this 2016 iit jee advanced rotational question.

For angular velocity about z axis there are two approaches in solutions available in books , internet , first one considering spin angular velocity and revolution angular velocity about z axis itself ; second one considering spin angular velocity and revolution angular velocity perpendicular to rod through O and then calculating angular velocity about z axis  taking cosine component of revolution angular velocity.

May refer 2nd picture attached.

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Find the moment of inertia of an ellipsoid about its mazor axis.

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