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A constant torque acting on a uniform ci...

A constant torque acting on a uniform circular wheel changes its angluar momentum from `A_0` to `4 A_0` in `4 s`. The magnitude of this torque is equal to.

A

`3 A_0//4`

B

`4 A_0`

C

`A_0`

D

`12 A_0`

Text Solution

Verified by Experts

The correct Answer is:
A
(a) `tau = (Delta L)/(Delta t) = (4 A_0 - A_0)/(4) = (3 A_0)/(4)`
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Knowledge Check

  • A constant torque acting on a uniform circular wheel changes its angular momentum from A to 4A in 4sec . The torque acted on it is

    A
    `(3A)/4`
    B
    `A/4`
    C
    `(2A)/4`
    D
    `(3A)/4`

  • A constant torque acting on a uniform circular disc changes its angular mkomentum from L to 4L/3 in 2 seconds. Then the magnitude of the torque applied is

    A
    L/3
    B
    2L/3
    C
    3L/2
    D
    L/6

  • If there is change of angular momentum from 1 J to 4 J in 4 second, then the torque is

    A
    `(3//4)J`
    B
    1 J
    C
    (5//4)J
    D
    (4//3)J
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