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Most Important Selected Qs for JEE AdvancedPhysicsRotational Motion

Paragraph: A solid cylinder of mass m and radius R is kept at rest on a plank of mass 2 m lying on a smooth horizontal surface. Massless and inextensible string connecting cylinder to the plank is passing over a massless pulley. The friction between the cylinder and the plank is sufficient to prevent slipping. Pulley A is pulled with a constant horizontal force F . Question: Magnitude of friction force acting on the

Options

  1. AF 7
  2. BF 14
  3. CF 21
  4. D2 F 7

Correct answer

B. F 14

Step-by-step solution

aligned & F = mg - f & =0= Fh - fR f = Fh R & ~F = mg - Fh R & ~F = mg 1+ h R & ~F _ when 'h' is = R aligned

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