anonymous
  • anonymous
Find the volume of the solid obtained by rotating the region bounded by x=8 y^2, y = 1, x = 0, about the y-axis. a) 8 y^2=0, x=0, how can I solve this when its like this, I mean there's no other x values so i can use the (0, ?)∫. I'm using this V = π ∫ f(x)² dx {a,b}
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
|dw:1351976086595:dw|
klimenkov
  • klimenkov
|dw:1351976458012:dw|
anonymous
  • anonymous
What's the graph between? 0 to 8 or 0 to 1?

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klimenkov
  • klimenkov
You can't use this formula in this case.
anonymous
  • anonymous
oh ok...
klimenkov
  • klimenkov
|dw:1351976777364:dw| And now you can. Calculate this integral and it will be the volume.
anonymous
  • anonymous
thanks so down we... v= π (0,1) ∫(8x^2)^2 dx-(8-x)^2π?
anonymous
  • anonymous
don't*
klimenkov
  • klimenkov
Can't understand you, just calculate the integral I've written. And it will be the volume. Can you do this?
anonymous
  • anonymous
sorry, yup i can
klimenkov
  • klimenkov
You can type the result and I will check it.
anonymous
  • anonymous
ok :)
anonymous
  • anonymous
64π/5?
klimenkov
  • klimenkov
Yes. That's correct.
anonymous
  • anonymous
Oh thanks so much!
anonymous
  • anonymous
so I just use 1 and 0 for ∫?
anonymous
  • anonymous
|dw:1351977717019:dw|
anonymous
  • anonymous
i know how i get 0 but not sure about 1, we use the graph right? cos its not between 0 and 1?
klimenkov
  • klimenkov
You need to understand how the formula is built to get how to solve this problem. I just switch x and y, so you can use your formula.
anonymous
  • anonymous
Ah ok
klimenkov
  • klimenkov
If you will rotate the area on my second figure about x-axes you will get the volume i drew on the first figure. Got it?
anonymous
  • anonymous
YEs!!!
anonymous
  • anonymous
thanks much Klim!!
klimenkov
  • klimenkov
No problems.

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