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Maths question

  1. Apr 16, 2009 #1
    1. The problem statement, all variables and given/known data
    A 2-dimensional force of 5[units] in the direction of the line y = 3x (upwards) acts through the
    point P = (−1,−2). Find the moment of the force about the origin

    2. Relevant equations

    M = Fd

    3. The attempt at a solution
    i tried putting x = -1 and y = -2 into the y=3x but it doesnt work and i completely dont know how to do it.
  2. jcsd
  3. Apr 16, 2009 #2
    i used the quation M= r X F
    where OP=r = -i -2j
    then i get M = (-i - 2j) X F
    i dont know what to do after that to find F
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