S is the surface of the solid bounded by the cylinder x^2+y^2= 1 and planes z=0 and z=2.
use the divergence theorem to calculate the surface integral where vector field F=.
My thoughts so far:
So I got my divF = 3x^2 + 3y^2+ 3z^2
then for my triple integral i said the bounds are {r,t,z: 0
Is this correct? if so, do i need to add the "r" in (r)(dz)(dr)(dt)
And in general how do I know when to add the extra r if this even applies? I am not exactly sure if this is what is called a Jacobian, but I am confused in when to put this.
Thanks for the help!
use the divergence theorem to calculate the surface integral where vector field F=
My thoughts so far:
So I got my divF = 3x^2 + 3y^2+ 3z^2
then for my triple integral i said the bounds are {r,t,z: 0
Is this correct? if so, do i need to add the "r" in (r)(dz)(dr)(dt)
And in general how do I know when to add the extra r if this even applies? I am not exactly sure if this is what is called a Jacobian, but I am confused in when to put this.
Thanks for the help!
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You are correct.
If you use polar or cylindrical coordinates, the jacobian equals r; you need to always include this factor in these conversions.
Jacobian for cylindrical coordinates:
Since x = r cos θ, y = r sin θ, z = z, the jacobian ∂(x,y,z)/∂(r, θ, z) equals
|..cos θ.....sin θ....0|
|-r sin θ...r cos θ...0| = r.
|.....0..........0.......1|
I hope this helps!
If you use polar or cylindrical coordinates, the jacobian equals r; you need to always include this factor in these conversions.
Jacobian for cylindrical coordinates:
Since x = r cos θ, y = r sin θ, z = z, the jacobian ∂(x,y,z)/∂(r, θ, z) equals
|..cos θ.....sin θ....0|
|-r sin θ...r cos θ...0| = r.
|.....0..........0.......1|
I hope this helps!