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gerryliyana

  • 3 years ago

Please help me guys.., (attachment)

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  1. gerryliyana
    • 3 years ago
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  2. Algebraic!
    • 3 years ago
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    what are r and sigma representing.

  3. Carl_Pham
    • 3 years ago
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    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.

  4. gerryliyana
    • 3 years ago
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    @CliffSedge can you help me please

  5. CliffSedge
    • 3 years ago
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    Been too long since I've done integrals like these. I'll have to refresh my memory first.

  6. Jemurray3
    • 3 years ago
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    |dw:1350687107096:dw|

  7. Jemurray3
    • 3 years ago
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    |dw:1350687145672:dw|

  8. Jemurray3
    • 3 years ago
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    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?

  9. gerryliyana
    • 3 years ago
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    why?

  10. Jemurray3
    • 3 years ago
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    when, in general, is a dot product zero?

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