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Sticky Note
The moment about a point p(0, 0, 0) of the force F= 21-j-k applied at Q(1, 1,
  1. 3i-3j
  2. 3j+3j
  3. 3j-3k
  4. None of these
Explanation

 3j-3k

  • A pair consists of two equally opposite forces acting on two different but parallel lines of action.
  • The moment of  force depends on the distance from the fulcrum and the magnitude of the force, but the moment of the pair is the net effect of the two moments of force.

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