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/sci/ - Science & Math

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3991667 No.3991667 [Reply] [Original]

how do i solve for the volume of the solid when i revolve the shaded area around the y axis

is the volume 57.44?

>> No.3991686

How did you get 57.44?

>> No.3991737

x = y^(1/3)
suma(pi*(y^(1/3))^2 , 0, 8, dy)
suma(pi*y^(2/3), 0, 8, dy)
(3/5 * pi * y^(5/3) ) evaluated from 0 to 8
3/5 * pi * 8^(5/3) - (3/5 * pi * 0^(5/3))
3/5 * pi * 32 - 3/5 * pi * 0
96*pi/5

>> No.3991750

>>3991737
Looks about right.
But that is 60.3 and not 57.44

>> No.3991778
File: 59 KB, 300x300, 1319861806324.jpg [View same] [iqdb] [saucenao] [google]
3991778

>>3991667
>2011
>not using the mathematical god that is wolfram

yes it is 57.44
http://www.wolframalpha.com/input/?i=integrate%20from%20%5B%2F%2Fquantity%3A0%2F%2F%5D%20to%20%5B%2F
%2Fquantity%3A2%2F%2F%5D%20of%20pi*(%5B%2F%2Fmath%3Ax%5E3%2F%2F%5D)%5E2

>> No.3991792
File: 199 KB, 583x700, ISHYGDDT.jpg [View same] [iqdb] [saucenao] [google]
3991792

>>3991778
>2011
>rotating the shaded area around the x axis instead of the y axis

>> No.3991796

the answer is 60.3 right?

>> No.3991798

>>3991778
Wolfram Alpha won't help you if you set the problem up incorrectly.
Rose Elizabeth Kelly-Lines cannot into calculus.

>> No.3991810
File: 28 KB, 338x309, ang2.png [View same] [iqdb] [saucenao] [google]
3991810

>>3991792
>>3991798
FUCK!!!
i absolutely fucking HATE being wrong!
http://www.wolframalpha.com/input/?i=integrate%20from%20%5B%2F%2Fquantity%3A0%2F%2F%5D%20to%20%5B%2F
%2Fquantity%3A8%2F%2F%5D%20of%20pi*(%5B%2F%2Fmath%3Acuberootx%2F%2F%5D)%5E2
FUCKING DERP!

>>3991796
yes!

>>3991798
FUCK YOU! im not her you RETARD 7/7/11-fag!

>> No.3991815

>>3991810
Don't be so hard on yourself Elizabeth

>> No.3991816

You need to find an equation for the radius of each disk in terms of y. Then integrate pi*r^2 over the range of y.

>> No.3991824 [DELETED] 

>>3991815
thats the fucking middle name you retard

>> No.3991831
File: 39 KB, 400x442, the_sad_clown[1].jpg [View same] [iqdb] [saucenao] [google]
3991831

Well, today I verified that yes, I do remember calculus, and I showed up EK. Today is a good day so far.
>mfw I remember that I'm too sick to go to class today and I have two labs on Thursdays.

>> No.3991827

>>3991824
Did you see what harriet said about you a few days ago?

>> No.3991833
File: 254 KB, 398x360, 13645647.png [View same] [iqdb] [saucenao] [google]
3991833

>>3991827
no, what did she say?

>> No.3991851

>>3991833
You should probably ask her. It was revealing personal medical information. Although it was vague, she went into more detail with more accuracy than when she said you were bipolar.

>> No.3991870

>>3991851
wat??
archive link?

>> No.3991889

>>3991870
installgentoo.net was down when she said it.

>> No.3991900

>>3991889
really? i just checked her name, and here was nothing in the archives about anything like that, i thought you were trolling....
no screencaps or anything?
i'll ask her.
dont bump plz

>> No.3991909
File: 146 KB, 469x428, Steelix.jpg [View same] [iqdb] [saucenao] [google]
3991909

>>3991900
bump

>> No.3991923

>>3991909
lold

>> No.3991944

>>3991900
I have a screen cap but I don't think it's fair for /sci/tizens to see it.

>> No.3992175

>>3991944
erm, rite ok. she says not, but did seem rather nervous, and she's usually a bad liar.
thanks for telling me, anyway

>> No.3992193

>>3991944
ah rite. ok, she says not, but she did seem nervous, and she's usually a bad liar.
thanks for telling me anyway.

>> No.3992197

ah rite, ok, she says not, but she seemed nervous, and she's usually a bad liar. thanks for telling me anyway.