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KVPY2014PhysicsOscillations

The maximum value attained by the tension in the string of a swinging pendulum is four times the minimum value it attains. There is no slack in the string. The angular amplitude of the pendulum is

Options

  1. A90^
  2. B60^
  3. C45^
  4. D30^

Correct answer

B. 60^

Step-by-step solution

T_ -m g= m v² R .(i) from energy cons. ki + ui = kf +u f O + mg ( R - R )= 1 2 mv ²+0 ~V ²=2 gR (1- ) Put in eq. (i) array l T_ =3 mg -2 mg T _ T _ =4 =60^ (B) array

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