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A bob hangs from a rigid support by an i...

A bob hangs from a rigid support by an inextensible string of length l. It is released from rest when string makes an agngle `60^(@)` with vertical . The speed of the bob at the lowest position is

A

`sqrt( gl)`

B

`sqrt( 3gl)`

C

`sqrt( 2gl)`

D

`sqrt( 5gl)`

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • A bob of mass 1 kg is suspended from an inextensible string of length 1 m. When the string makes an angle 60^(@) with vertical, speed of the bob is 4 m/s Net acceleration of the bob at this instant is

    A
    `16 m//s^(2)`
    B
    `20.4 m//s^(2)`
    C
    `18.2 m//s^(2)`
    D
    `10.4 m//s^(2)`

  • A bob of mass 1 kg is suspended from an inextensible string of length 1 m. When the string makes an angle 60^(@) with vertical, speed of the bob is 4 m/s Upto what maximum height will the bob rise with respect to the bottommost point ?

    A
    1.6 m
    B
    1.8 m
    C
    1.3 m
    D
    2 m

  • A bob hangs from a rigid support by an inextensible string of length l . If it is displaced through a distance l (from the lowest position) keeping the string straight and then released. The speed of the bob at the lowest position is

    A
    `sqrt(gl)`
    B
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    C
    `sqrt(2gl)`
    D
    `sqrt(1.5 gl)`

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