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AP EAMCET202318 May 2023Evening ShiftPhysicsMotion in Two DimensionsActual

A motor boat is moving in a river with velocity v =7 i +2 j -5 k ms ⁻¹ . If the flow of water offers resistive force F =9 i +3 j -3 k N , then the power of the boat is

Options

  1. A13 ~W
  2. B69 ~W
  3. C12 ~W
  4. D84 ~W

Correct answer

D. 84 ~W

Step-by-step solution

Velocity of boat V=7 i +2 j -5 k ~m / s aligned & Force, F=9 i +3 j -3 k N & Power, P=? & P=F V & =(9 i +3 j -3 k ) (7 i +2 j -5 k ) & =63+6+15 & P=84 ~W aligned

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