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Math Help - double integral in vector calculus

  1. #1
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    double integral in vector calculus

    A field is given G = \frac{25}{x^2+y^2}(x\hat{a}_x + y\hat{a}_y)
    Find
    a.) unit vector in the direction G at (3,4,-2)
    already answered :
    by substitution
    3a_x + 4a_y so unit vector is:
    0.6a_x + 0.8a_y
    b.) the angle between G and a_x at P
    already answered :
    arctan of (0.8/0.6)


    this is my problem:
    c.)Find the value of the double integral on the plane y = 7
    i dont know how the limits are found
    can someone help?

    ans. 26
    Last edited by ^_^Engineer_Adam^_^; June 23rd 2008 at 05:58 AM.
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  2. #2
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    the following solution is correct:
    \int_{0}^{4}\int_{0}^{2} G \hat{a}_{y} dz dx
    does anyone know how the limits are found?
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