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Math Help - Find a unit vector

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    Find a unit vector

    Find a unit vector a which is horizontal and perpendicular to the vector b=4i -3j +7k.
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by varunnayudu View Post
    Find a unit vector a which is horizontal and perpendicular to the vector b=4i -3j +7k.
    how are you defining "horizontal" here? in the xy-plane?

    if so, just make the z-coordinate zero. otherwise, we need the dot product of the vectors to be zero.

    so the horizontal vector perpendicular to <a, b, c> is the vector <b, -a, 0>

    so here, your vector would be, a = -3i - 4j

    now find the unit vector in that direction
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