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Math Help - vectors

  1. #1
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    vectors

    just needed a clue on how to start the math behind this thanks!!
    find a unit vector, if terminal point is at (4,4) on 4y=x^2, is normal to the curve and pointed towards the positive y-axis
    Last edited by rabih2011; July 7th 2010 at 10:58 AM.
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  2. #2
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    Quote Originally Posted by rabih2011 View Post
    just needed a clue on how to start the math behind this thanks!!
    find a unit vector, if terminal point is at (4,4) on 4y=x^2, is normal to the curve and pointed towards the positive y-axis
    I hope that I understand your question correctly this time ..

    Here are the steps to perform:

    1. Determine the gradient m of the curve at P(4, 4).
    2. Determine the orthogonal direction n of the gradient using m\cdot n = -1
    3. n can be written as a vector \vec n = (1, n). Determine the length of \vec n and consequently
    4. Calculate the unit vector of \vec n
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