anonymous
  • anonymous
Please help me guys.., (attachment)
Physics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
what are r and sigma representing.
anonymous
  • anonymous
r is probably the vector from the origin to any point on the surface, and sigma is probably the unit vector normal to the surface at that point.

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anonymous
  • anonymous
@CliffSedge can you help me please
anonymous
  • anonymous
Been too long since I've done integrals like these. I'll have to refresh my memory first.
anonymous
  • anonymous
|dw:1350687107096:dw|
anonymous
  • anonymous
|dw:1350687145672:dw|
anonymous
  • anonymous
So when it says that \[ \vec{r}\cdot d\vec{\sigma}=0 \] for three of the surfaces, can you see which three this pertains to and why?
anonymous
  • anonymous
why?
anonymous
  • anonymous
when, in general, is a dot product zero?

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