The angular velocity of a body is vecome...

The angular velocity of a body is `vecomega =2hati+3hatj-4hatk` and torque `vectau=hati+2hatj+3hatk` acts on it. The rotational power is

A

5 W

B

10 W

C

15 W

D

20 W

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The correct Answer is:

D

Power `P=tau.vecomega=(hati+2hatj+3hatk).(2hati+3hatj+4hatk)=2+6+12=20W`

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