# Vector Calculus - Stokes and Divergence theorem

• Aug 26th 2010, 06:43 AM
staxxyp
Vector Calculus - Stokes and Divergence theorem
Evaluate the surface integral:

integrate with respect to S (curl(f)).ds

where S is the open surface of the hemisphere x^2+y^2+z^2=a^2, z>0
with the outward normal chosen and f is the vector field:

f=(x+1)yi+y^2j+3x^2y^3zk

using
a)Stokes theorem
b)Gauss theorem
• Aug 26th 2010, 11:16 AM
HallsofIvy
Okay, do know what "Stokes theorem" and "Gauss' theorem" are? If not, look them up! What do they say?
• Aug 30th 2010, 01:06 AM
staxxyp
I know what they are but whenever I try and apply them to a question I get it wrong, so I wanted to see a method to see what I'm doing wrong.
• Aug 30th 2010, 04:06 AM
AllanCuz
Quote:

Originally Posted by staxxyp
I know what they are but whenever I try and apply them to a question I get it wrong, so I wanted to see a method to see what I'm doing wrong.

I imagine what HallsofIvy was implying was that these problems require a fairly straight forward application of the theorems. That is, you have the closed surface and a given vector; all that is left is to apply the definition of the theorems. So what have you done? Where are you stuck? If you show us some work we can show you where you went wrong! If you just want examples of how to typically solve these problems use google!