- #1
epiclier
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Homework Statement
By making two successive simple changes of variables, evaluate:
I =[itex]\int\int\int x^{2} dxdydz[/itex]
inside the volume of the ellipsoid:
[itex]\frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}+\frac{z^{2}}{c^{2}}=R^{2}[/itex]
Homework Equations
dxdydz=r^2 Sin(phi) dphi dtheta dr
The Attempt at a Solution
I will post more here if needed.So I let x=au y=bv z=cw
then I calculated the jacobian which gave |J|=abc
I then manipulated the integral to get:
[itex]a^{3}bc \int\int\int r^{4} sin^{2}(phi}cos{theta} dphi dtheta dr[/itex]
where r is from 0->R
theta is from 0->2π
phi is from 0->π
Following this through got me the answer of:
V=[itex]\frac{a^{3}bc\pi}{2}[/itex]
Would anybody be able to confirm this answer for me?
Thanks in advance!
Epiclier