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Angular velocity of a body at an instant of time is ω→=2i^+j^+4k^ rad/s. A constant torque of 2i^+2j^+2k^ is applied on it . Then power input to the body is

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a

8 Watt

b

12 Watt

c

14 Watt

d

10 Watt

answer is C.

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Detailed Solution

Power input =τ→.ω→=2i^+2j^+2k^.2i^+j^+4k^W=4+2+8W=14 Watt

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