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Math Help - surface integral problems

  1. #1
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    surface integral problems

    hey guys need help with these problems. thanks


    Evaluate the given integral:
    surface integral xz dS over S where S is the triangle with vertices (1,0,0),(0,1,0), and (0,0,1)

    and

    Evaluate the surface integral F dot dS for the given vector field F and the given orientated surface S. In other words find the flux of F across S. For closed surfaces use the positive (outward) orientation F(x,y,z)= -y i +x j +3z k ; S is the hemisphere z=sqrt(16-x^2-y^2)
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