- #1
kingwinner
- 1,270
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1) Find the volume of T bounded below by the cone z=sqrt(x2+y2) and above by the sphere x2+y2+z2=1.
Solution:
Volume =
∫∫∫ 1 dV =
T
b d f
∫ ∫ ∫ r (d theta)dzdr (change of variables to cylindrical coordinates)
a c e
where
a=0
b=1/sqrt2 <---I am having a lot of trouble understanding this upper limit of integration for dr...clearly, not every level in the solid T have this radius (the radius is not constant in the solid T, it's part of a cone!)...help
c=r
d=sqrt(1-r2)
e=0
f=2pi
Could someone kindly explain?
Solution:
Volume =
∫∫∫ 1 dV =
T
b d f
∫ ∫ ∫ r (d theta)dzdr (change of variables to cylindrical coordinates)
a c e
where
a=0
b=1/sqrt2 <---I am having a lot of trouble understanding this upper limit of integration for dr...clearly, not every level in the solid T have this radius (the radius is not constant in the solid T, it's part of a cone!)...help
c=r
d=sqrt(1-r2)
e=0
f=2pi
Could someone kindly explain?
Last edited: