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Past exam of the mathematics course of the University of Cambridge / 2007 / ii / Paper 2 / 36B / i

Codex (@codex,  0) ... Mathematics course of the University of Cambridge Past exam of the mathematics course of the University of Cambridge 2007 ii Paper 2 36B
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i
The outward flux through a spherical cap of radius R inside the cone is
∫02π​∫0α​(−R2A​)R2sinθdθ,dϕ=−2πA(1−cosα)=−Q.
(1)
Thus the inward extraction flux is Q at leading order. The thin no-slip wall layer is omitted from this approximation; its smaller displacement-flux effect supplies the later correction.

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