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BITSAT2016PhysicsLaws of MotionActual

A frictionless wire AB is fixed on a sphere of radius R . A very small spherical ball slips on this wire. The time taken by this ball to slip from A to B is

Options

  1. A2 g R g
  2. B2 g R g
  3. C2 R g
  4. Dg R g

Correct answer

C. 2 R g

Step-by-step solution

Acceleration of body along AB is g Distance travelled in time t sec =A B= 1 2 (g ) t² From ABC , AB =2 R Thus, 2 R = 1 2 g t² t²= 4 R g t=2 R g

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