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Most Important Selected Qs for JEE AdvancedPhysicsRotational Motion

Two identical ring of equal mass ' m ' and radius ' R ' rigidly attached wears a bead of mass ' m '. Bead can freely slide without friction. It is hinged at point ' P ' in such a way that it can freely rotates about horizontal axis passing through point ' P '. The ring and bead are released from rest from give position. Then, just after release

Options

  1. AThe magnitude of angular acceleration of ring is 5 g 17 R
  2. BThe magnitude of angular acceleration of rod is 2 g 9 R
  3. CThe magnitude of acceleration of bead is 2 g 7
  4. DThe magnitude of acceleration of bead is 85 g 9

Correct answer

D. The magnitude of acceleration of bead is 85 g 9

Step-by-step solution

For Bead, aligned & 2 m g R-R_x R=8 m R^2 ~(1) & R _x=m a_x ~(2) & a _x= R ~(3) aligned From (1),(2) & (3) aligned & = 2 g 9 R & m g=m a_y a_y=g aligned acceleration of bead = 85 g 9

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