IIT JEE Advanced 2016 | Rotational Motion Toughest Question Solution | #jeeadvanced2016 #iitjee

Two thin circular discs of mass m and 4m, having radii of a and 2a, respectively, are rigidly fixed by a massless, rigid rod of length l=√24 a through their centers. This assembly is laid on a firm and flat surface, and set rolling without slipping on the surface so that the angular speed about the axis of the rod is ω. The angular momentum of the entire assembly about the point 'O' is L ⃗ (see the figure). Which of the following statement(s) is(are) true?
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In this video, we have applied the angular momentum concept to solve the problem. Here we need to find the net angular momentum of the assembly about point 0. It is the sum of orbital and spin angular momentums.
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Timecodes:
00:08 - Problem Overview
02:02 - Conceptual Basics
04:00 - Angular Momentum about Center of Mass
06:03 - Angular Momentum of COM about O
11:21 - Net Angular Momentum about O
15:20 - Angular Velocity of COM
18:30 - Summary of the Complete Problem