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An athlete throws a discus from rest to ...

An athlete throws a discus from rest to a final angular velocity of `15 rad s^-1` in `0.270 s` before releasing it. During acceleration, discuss moves a circular arc of radius `0.810 m`. Acceleration of discus before it is released is.

A

`45 m s^(-2)`

B

`182 m s^(-2)`

C

`187 m s^(-2)`

D

`192 m s^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
a
`omega=omega_(0) + alphat` or `omega==+ alphat`
or `alpha=omega/t= 15/0.270 = 45 ms^(-2)`
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Knowledge Check

  • An athlete throws a discus from rest to a final angular velocity of 15 rad s^(-1) in 0.270 s before releasing it. During acceleration, discus moves in a circular arc of radius 0.810 m. Acceleration of discus before it is released is

    A
    `45 m s^(-2)`
    B
    `182 m s^(-2)`
    C
    `187 m s^(-2)`
    D
    `192 m s ^(-2)`

  • A wheel starts from rest and acquires an angular velocity of 60 rad//s in half a minute . Then its angular acceleration is

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    `1 rad//s^(2)`
    D
    `0.5 rad//s^(2)`

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