Volumes of Solids of Revolution - Integration

**khanim** · October 2nd 2009, 01:21 AM

I hope this in the correct section, admin please move it if its not

Determine the volume generated when the given plane figure is rotated about the y axis

$x^2 - y^2 = 16$

$y=0$ $x=8$

I'm having a problem with the integration part of it

Please help

**mr fantastic** · October 2nd 2009, 03:57 AM

Originally Posted by khanim

I hope this in the correct section, admin please move it if its not

Determine the volume generated when the given plane figure is rotated about the y axis

$x^2 - y^2 = 16$

$y=0$ $x=8$

I'm having a problem with the integration part of it

Please help

By definition: $V = \pi \int_{y = 0}^{y = 8} x^2 \, dy$ .

Substitute $x^2 = 16 + y^2$ into the integral. I don't see where the trouble can be ....?

**DeMath** · October 2nd 2009, 05:05 AM

Originally Posted by mr fantastic

By definition: $V = \pi \int_{y = 0}^{y = 8} x^2 \, dy$ .

Substitute $x^2 = 16 + y^2$ into the integral. I don't see where the trouble can be ....?

Maybe do you mean this $V = \pi \int\limits_0^{4\sqrt 3 } {\left( {64 - \left( {16 + {y^2}} \right)} \right)dy}$ ??

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