- #1
bugatti79
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Homework Statement
Folks, have I set these up correctly? THanks
Use divergence theorem to calculate the surface integral \int \int F.dS for each of the following
Homework Equations
[tex] \int \int F.dS=\int \int \int div(F)dV[/tex]
The Attempt at a Solution
a) [tex]F(x,y,z)=xye^z i +xy^2z^3 j- ye^z k[/tex] and sigma is the surface of the box that is bounded by the coordinate planes and planes x=3, y=2 and z=1
Attempt
[tex]\int_0^3 \int_0^2 \int_0^1 2xyz^3 dzdydx[/tex] where [tex]div (F)=ye^z+2xyz^3-ye^z[/tex]
b) [tex]F(x,y,z)=3xy^2 i+xe^zj+z^3k[/tex] and sigma is surface bounded by cylinder y^2+z^2=1 and x=-1 and x=2
Attempt
[tex]\int_0^{2\pi} \int_0^{1} \int_{-1}^{2} (3r^2) r dxdrd\theta[/tex] where [tex]div(F)=3y^2+3z^2[/tex]
c)[tex] F(x,y,z)=(x^3+y^3)i+(y^3+z^3)j+(x^3+z^3)k[/tex] and sigma is sphere of r=2 and centre 0,0
Attempt
[tex]\int_0^{2\pi} \int_0^{\pi} \int_0^{2} 3p^4 sin(\phi) dp d\phi d\theta[/tex] where [tex]div(F)=3(x^2+y^2+z^2)[/tex]...?
Thanks