Qualification > Math
Maths/Physics help
astarmathsandphysics:
--- Quote from: omarsubei on April 10, 2009, 09:28:39 pm ---Hi it's been a while.
As usual I'm getting a different answer to the markscheme,
"A circle has equation x^2 + (y-3)^2 = 4 . Knowing that y= +/- (4 - x^2)^0.5 , find the volume of revolution of the shaded region about the x-axis.
The mark scheme says 144, and I got 237
PLEASE HELP!
--- End quote ---
Surely y= 3+/- (4 - x^2)^0.5
omarsubei:
Ya I know I just wanted to make it less time consuming for you
astarmathsandphysics:
What region is shaded? If you cant say which paper the question is on can you describe it?
omarsubei:
The whole circle is shadad
omarsubei:
It's an integration question, to do with integral of the function squared multiplied by pie, if that helps
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