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Divergence Problem

  1. Nov 23, 2008 #1
    1. The problem statement, all variables and given/known data

    Find the flux of the vector field out of the closed surface bounding the solid region x^2 + y^2 ≤ 16, 0 ≤ z ≤ 9, oriented outward.

    F = x^3 + y^3 + z^3

    2. Relevant equations

    3. The attempt at a solution
    I found the divergence which is 3x^2+3y^2+3z^2.

    And then i'm stuck. I know Flux is divergence * Volume, in a simplifed way. So i factored 3 out, and i got 3(x^2+y^2) + 3z^2. I do not know where to go from here. Thanks in advance
  2. jcsd
  3. Nov 23, 2008 #2


    User Avatar

    Integrate over the surface using the transformation to cylindrical co-ordinates, using x = square_root(16) cos(theta) and similarly for y, and the divergence theorem gives support to your integrating over the vector field, once you have added in the jacobian, from zero to two pi for theta, and from zero to 9 for z.
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