- #1
missavvy
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Homework Statement
Find the volume of the cone bounded below by z=2root(x2+y2) and above by x2 + y2 + z2 = 1
Homework Equations
The Attempt at a Solution
Ok I have the solution, I just don't understand how to get it!
So I know I have to change into spherical coordinates but I'm having trouble with this...
so the coordinates are of the form (r, [tex]\varphi[/tex], [tex]\vartheta[/tex])
THe equation of the cone is: tan[tex]\varphi[/tex] = 1/2, r=1 is the equation of the sphere...
My question is how to I swtich from cartesian to spherical?
I thought (x,y,z) = (r, [tex]\varphi[/tex], [tex]\vartheta[/tex]) = (rsin[tex]\varphi[/tex]cos[tex]\vartheta[/tex], rsin[tex]\varphi[/tex]sin[tex]\vartheta[/tex], rcos[tex]\varphi[/tex])
I tried setting r=1=x2 + y2 + z2 ...
Er.. what do I "solve" for first?
Also I know it can be solved using cylindrical coordinates.
Is there one "easier" than the other?
I'm really frustrated.. sorry if this is sloppy :(