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Math Help - Vectors question, I am stuck.

  1. #1
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    Vectors question, I am stuck.

    A force F of magnitude 20N acts at the point with co-ordinates (2,-1,4) in the direction of the vector 3i-j+2k Calculate the following:
    i) Its vector moment about the point with co-ordinates (4,5,0)
    ii) The work done by the force if its point of application moves to the point (2,3,-1)

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  2. #2
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    Quote Originally Posted by leila View Post
    A force F of magnitude 20N acts at the point with co-ordinates (2,-1,4) in the direction of the vector 3i-j+2k Calculate the following:
    i) Its vector moment about the point with co-ordinates (4,5,0)
    ii) The work done by the force if its point of application moves to the point (2,3,-1)

    thnx all.. LOVE U!!
    i)Wrong forum but I can try to help. I'm pretty sure you need to first find the moment of (3, -1, 2) and (2-4, -1-5, 4-0), take the cross product of those two vectors and multiply by the magnitude.
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