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The angular velocity of a body is vec(om...

The angular velocity of a body is `vec(omega)=2hati+3hatj+4hatk` and a torque `vec(tau)=hati+2hatj+3hatk` acts on it. The rotational power will be

A

20 watt

B

15 watt

C

`sqrt(17)` watt

D

`sqrt(14)` watt

Text Solution

Verified by Experts

The correct Answer is:
A
`vecP=vectau*vecomega`
`=(hati+2hatj+3hatk)*(2hati+3hatj+4hatk)`
`=(2+6+12)=20` watt
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