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A disc is rotating with angular velocity...

A disc is rotating with angular velocity `vecomega`. A force `vecF` acts at a point whose position vector with respect to the axis of rotation is `vecr`. The power associated with the torque due to the force is given by :

A

`(vecrxxvecF)xxvecomega`

B

`(vecrxxvecF).vecomega`

C

`vecr.(vecFxxvecomega)`

D

`vecrxx(vecF.vecomega)`

Text Solution

Verified by Experts

The correct Answer is:
B
`vectau=vecrxxvecFandP=vectauxxvecomega`
`therefore P=(vecrxxvecF).vecomega`
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