# 65 - Rotational mechanics Questions Answers

Sir you have discussed a problem earlier krotov 1.23 problem sir you solved that problem by taking a point o on the circle sir but. My question is that can we observe it from centre frame

**Asked By: UJJWAL DWIVEDI**

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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.

**Asked By: RK GUPTA**

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