Homework Help: Calculus

Posted by Mackenzie on Wednesday, November 28, 2012 at 2:28pm.

Evaluate, in spherical coordinates, the triple integral of f(rho,theta,phi)=cos (phi) , over the region 3<rho<7, 0<theta<2pi, 0<phi<pi/3.

I used the equation cos (phi)*sin(phi)*rho d(rho)d(phi)d(theta) with the given boundaries.

I got -632*pi*sqrt(3)/12
But that answer is wrong.

Calculus - Mackenzie, Wednesday, November 28, 2012 at 2:29pm
The equation I used is cos (phi)*sin(phi)*rho^2 d(rho)d(phi)d(theta)

I misspelled it on the first message.
Calculus - Steve, Wednesday, November 28, 2012 at 2:48pm
Hmmm.

∫∫∫ f(p,θ,φ) dv
=∫[0,π/3]∫[0,2π]∫[3,7] p^2 sinφ cosφ dp dθ dφ
= ∫[0,π/3]∫[0,2π] 316/3 * 1/2 sin2φ dθ dφ
= 316π/3 ∫[0,π/3] sin2φ dφ
= -158π/3 (-1/2 - 1)
= 316π

better double-check my math :-)
Calculus - Steve, Wednesday, November 28, 2012 at 2:56pm
oops. That'd be 79π on that last step.

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