1.

The angular momentum of a wheel changes from 2L to 5L in 3 seconds. What will be the magnitude of torque acting on it?

Answer»

`(L)/(5)`
`(L)/(2)`
`(L)/(3)`
L

Solution :`tau=(DL)/(DT)=(L_(2)-L_(1))/(3)=(5L-2L)/(3)=(3L)/(3)=L`


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