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NTA Abhyas JEE Main2020PhysicsRotational MotionPractice

A right triangular plate ABC of mass m is free to rotate in the vertical plane about a fixed horizontal axis through A . It is supported by a string such that the side AB is horizontal. The reaction at the support A is

Options

  1. Am g 3
  2. B2 m g 3
  3. Cm g 2
  4. Dm g

Correct answer

B. 2 m g 3

Step-by-step solution

For equilibrium of torque about A, m g l 3 = T l or T = m g 3 For verticle equilibrium of plate, R A + T = m g ∴ R A = 2 m g 3

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