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Math Help - [SOLVED] anybody can help me about vector

  1. #1
    Newbie
    Joined
    Mar 2009
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    [SOLVED] anybody can help me about vector

    im learn vector by myself.
    i found this questions with answers, but i dunno the step to get that answer.
    can anybody help me?



    Given vectors A = (1, 2, -3), B = (3, -4, 0) and C = (0, 3, -4), find the following:

    (i)theta AC
    (ii)A(BxC)
    (iii)Ax(BxC)
    (iv) (Axj) k

    Answer:

    (i)15.8
    (ii)13
    (iii)(54, -57, -20)

    (iv)1
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  2. #2
    Junior Member
    Joined
    Feb 2009
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    1>theta AC.

    APPLY DOT PRODUCT.A.C=AC cos(theta)

    or,18=sqrt.(14)*5 *cos(theta)

    or,theta=15.81deg.

    2>B X C=(3i-4j)x(3j-4k)=(9k+12j+16i)

    A.(BXC)=13.

    3>follow similarly the rules for cross product.

    4>it is very simple if ur concept becomes clear on cross & dot product.
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