Volume in Spherical Coordinates


by craigory
Tags: coordinates, spherical, volume integral
craigory
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#1
Feb7-12, 06:30 PM
P: 3
1. The problem statement, all variables and given/known data

express a volume element dV= dx*dy*dz in spherical cooridnates.
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lanedance
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#2
Feb7-12, 07:16 PM
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have a crack mate! any ideas?
craigory
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#3
Feb7-12, 07:35 PM
P: 3
Is it simply to convert x y and z into corresponding spherical coordinates (ie r cos θ etc)

HallsofIvy
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#4
Feb7-12, 09:20 PM
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Volume in Spherical Coordinates


One way to do this is geometric- given specific r, [itex]\theta[/itex], and [itex]\phi[/itex], mark off a small "[itex]\Delta r[/itex]", "[itex]\Delta \theta[/itex]", "[itex]\Delta \phi[/itex]" about the point and caculate its volume.

Another is analytic- determine dx, dy, and dz in terms of r, [itex]\theta[/itex], [itex]\phi[/itex], [itex]dr[/itex], [itex]d\theta[/itex], and [itex]d\phi[/itex], then multiply- but remember that multiplcation of differentials is anti-commutative: [itex]a(r,\theta, \phi)drd\theta= -a(r, \theta, \phi)d\theta dr[/itex].


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