# 66 - 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

Joshi sir comment
Joshi sir comment
Joshi sir comment

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.