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the bob of simple pendulum is relas...

the bob of simple pendulum is relasesd when string makes an angle ` theta ` with the vertical . If m be the mass of the bob then find the tension when the bob is at the bottiommost position .

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A nail is located at a certain distance vertically below the point of suspension of a simple pendulum . The pendulum bob is released from a position where the string makes an angle of 60^@ with the vertical. When the thread of the pendulum gets obstructed by the nail, if the bob can perform a complete rotation with the nail as centre ,find out the distance of the nail from the point of suspension.

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Knowledge Check

  • If metal bob of a simple pendulum is replaced by a wooden bob, then its time period will

    A
    increase
    B
    decrease
    C
    remain the same
    D
    first (A) then (B)

  • A simple pendulum of length L swings in a vertical plane. The tension of the string when it makes an angle theta with the vertical and the bob of mass m moves with a speed v is (g is the gravitational acceleration)

    A
    `mv^(2)//L`
    B
    `mgcostheta+mv^(2)//L`
    C
    `mgcostheta-mv^(2)//L`
    D
    `mgcostheta`

  • A simple pendulum of length l swings in a vertical plane. The tension of the string when it makes an angle theta with the vertical and the bob of mass m moves with a speed v is (g is the gravitational acceleration)

    A
    `(mv^2)/L`
    B
    `mgcostheta+(mv^2)/L`
    C
    `mgcostheta-(mv^2)/L`
    D
    `mg cos theta`

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