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Math Help - Unit Vectors

  1. #1
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    Unit Vectors

    Given the two displacements D = (6i^ + 3j^ - K^)m and E = (4i^ - 5j^ + 8k)m

    Find magnitude of displacement 2D - E

    F = 2(6i^ + 3j^ - K^)m - (4i^ - 5j^ + 8k)m =
    [(12 - 4)i^ + (6 + 5)j^ + (-2 - 8)k^]m
    = (8i^ + 11j^ - 10k^)m

    F = sqrt{Fx^2 + Fy^2 + Fz^2} =
    sqrt{(8m)^2 + (11m)^2 + (-10m)^2 = 17m}

    Nevermind. I understand now.
    Last edited by epimetheus; April 23rd 2011 at 01:25 PM.
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