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Moment about a point in an incline plane

  1. Oct 9, 2016 #1
    1. The problem statement, all variables and given/known data

    Probs._448_49.jpg

    Force F = 460 N acts perpendicular to the inclined plane

    Determine the moment produced by F about point A.
    Enter the x, y, and z components of the moment separated by commas.
    2. Relevant equations


    3. The attempt at a solution

    r(CA)=4j-3k
    u(CA)=4/5j-3/5k

    r(CB)=-3i+4j
    u(CB)=-3/5i+4/5j

    u(CA) x u(CB)=1.28i+.36j+.48k
    F=460(1.28i+.36j+.48k)=589i+166j+221k

    r(CA) x F=1382i-1767j-2356k

    masteringengineering.com says the answer is wrong. Please help!
     
  2. jcsd
  3. Oct 9, 2016 #2

    Orodruin

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    Is the magnitude of this force 460 N?
     
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