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help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 07:59:10
and this sounds right.... for more visualisation
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1
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1,298
help-10
b1196c3d84e34f30b15b36352d104419
264,472,398,596,669,440
chxn
03/17/2022 07:59:14
but I was confused on finding R and r
1
0
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null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 07:59:20
draw a varying horizontal line
0
1
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1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 07:59:29
y = a 0 < a < 2
0
1
null
null
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null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 07:59:33
slider on desmos
0
1
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1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 07:59:39
thats how you are integrating I believe
0
1
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1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:00:03
And then figure out the corresponding discs involved for each horizontal line
0
1
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1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:00:30
So for a particular height y, you need to figure out what the 2 radii are
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1
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1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:00:40
The biggest one is 4. But then the smaller one...
0
1
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1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:01:08
it is the horizontal distance from x = 4 to the function
0
1
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1,298
help-10
b1196c3d84e34f30b15b36352d104419
264,472,398,596,669,440
chxn
03/17/2022 08:01:35
Is just sqrtx or y^2 since we are doing with dy?
1
0
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1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:02:33
,, \pi\int^2_0R(y)^2-r(y)^2 \,\dd y
0
1
null
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null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
510,789,298,321,096,700
TeXit
03/17/2022 08:02:46
https://cdn.discordapp.c…119171756033.png
321445119171756033.png
0
1
null
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null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:02:49
I like writing like this
0
1
null
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null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:02:59
and determining what the functions are so I am clear in my working
0
1
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1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:03:02
and sure of the answer
0
1
321,445,119,171,756,000
Shuri2060
9525
a μ-er
false
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:03:30
,, \pi\int^2_04^2-r(y)^2 \,\dd y
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
510,789,298,321,096,700
TeXit
03/17/2022 08:03:33
https://cdn.discordapp.c…119171756033.png
321445119171756033.png
0
1
264,472,398,596,669,440
chxn
2203
chxn
false
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:03:37
Lets see for r(y)
0
1
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1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:04:31
If you are y up, your x coord is y^2
0
1
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1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:04:42
so the distance is 4 - y^2, I agree
0
1
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1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:04:53
In particular if you are at (x, y) on the function
0
1
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1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:05:02
the little radius is 4-x
0
1
null
null
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null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:05:10
so what you did sounds right
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:05:25
,, \pi\int^2_04^2-(4-y^2)^2 ,\dd y
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
510,789,298,321,096,700
TeXit
03/17/2022 08:05:27
https://cdn.discordapp.c…119171756033.png
321445119171756033.png
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:05:31
oh wait
0
1
null
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null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:05:43
no i think we disagree then 🤔
0
1
null
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null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:05:49
no no
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:05:54
i typed it wrong
0
1
null
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null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:05:56
😂
0
1
null
null
null
null
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1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:06:07
Ok no sorry
0
1
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null
null
null
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1,298
help-10
b1196c3d84e34f30b15b36352d104419
264,472,398,596,669,440
chxn
03/17/2022 08:06:07
Okay lol I was about to be so confused
1
0
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:06:17
I think I disagree with this
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:06:41
https://media.discordapp…552/IMG_3916.png
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:06:54
uhhh let me adjust this diagram
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
264,472,398,596,669,440
chxn
03/17/2022 08:07:49
Whaa I mean I was basically just saying this but a little different?
1
0
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:08:07
i think it is not quite there but one sec, desmos
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:09:36
https://cdn.discordapp.c…20317-120930.jpg
Screenshot_20220317-120930.jpg
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:09:47
Ok you agree it is this? spinning around the blue line
0
1
null
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null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:10:16
We need to calculate the volume of the purple region rotated around it
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
264,472,398,596,669,440
chxn
03/17/2022 08:10:50
Mhmm
1
0
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:11:35
https://cdn.discordapp.c…20317-121126.jpg
Screenshot_20220317-121126.jpg
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:11:43
So imagine that black line sliding up and down
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:11:59
We are adding the corresponding annulus
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:12:10
for each of the black line... does that make sense?
0
1
null
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null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
264,472,398,596,669,440
chxn
03/17/2022 08:12:49
What’s annulus :monkaS:
1
0
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:13:18
disc?
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:13:23
does that make sense?
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
264,472,398,596,669,440
chxn
03/17/2022 08:13:28
Ye
1
0
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:13:31
disc is the area enclosed by a circle
0
1
264,472,398,596,669,440
chxn
2203
chxn
false
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:13:42
annulus is if you subtract 1 disc from another
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:13:45
like a ring
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:13:48
2d donut
0
1
510,789,298,321,096,700
TeXit
0796
TeXit
true
1,298
help-10
b1196c3d84e34f30b15b36352d104419
264,472,398,596,669,440
chxn
03/17/2022 08:13:53
Okay yeah makes sense
1
0
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:13:59
and we want that right
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:14:20
So to calculate that we need to subtract the area of one circle from another
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:14:40
We cannot just calculate the area of a circle whose radius is equal to the difference
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:15:39
https://www.desmos.com/calculator/jv7nf3denj
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:15:55
vary the a slider
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:16:02
that black line is R-r
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:16:16
but pi(R-r)^2 isnt what we need
0
1
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null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
264,472,398,596,669,440
chxn
03/17/2022 08:16:54
Mhm?
1
0
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:17:36
https://cdn.discordapp.c…20317-121728.jpg
Screenshot_20220317-121728.jpg
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:17:41
Take this example
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:17:46
to calculate the green region area
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:17:57
You dont just do pi(3 - 2)^2
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:18:06
that would be the area of a circle of radius 1
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:18:11
but its not quite that
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:18:36
you do pi(3^2 - 2^2)
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:18:46
You subtract the area of one circle from another
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
264,472,398,596,669,440
chxn
03/17/2022 08:19:44
Ahh I forgot about pemdas
1
0
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
264,472,398,596,669,440
chxn
03/17/2022 08:19:55
I have been doing the exponent first anyways 💀
1
0
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:20:03
uh
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:20:08
im not sure this is about pemdas...
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:20:26
$(a+b)^2\neq a^2+b^2$
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
510,789,298,321,096,700
TeXit
03/17/2022 08:20:28
https://cdn.discordapp.c…119171756033.png
321445119171756033.png
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:21:03
,, \pi\int^2_0R(y)^2-r(y)^2 ,\dd y\neq \pi\int^2_0(R(y)-r(y))^2 ,\dd y
0
1
null
null
null
null
null
1,298
help-10
b1196c3d84e34f30b15b36352d104419
510,789,298,321,096,700
TeXit
03/17/2022 08:21:17
https://cdn.discordapp.c…119171756033.png
321445119171756033.png
0
1
null
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b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:21:23
so to recap, you want the left, not the right
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b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:21:27
does that make sense?
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b1196c3d84e34f30b15b36352d104419
264,472,398,596,669,440
chxn
03/17/2022 08:21:36
yes
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b1196c3d84e34f30b15b36352d104419
264,472,398,596,669,440
chxn
03/17/2022 08:21:59
I don’t know how to explain the thing I was doing but either way it was not correct
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b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:22:06
But also, I think you didnt quite get `r(y)` right the first time round
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b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:22:14
yh
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b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:22:27
Well i highly advise drawing a diagram for these Qs
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b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:22:36
and identify the axis of rotation
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b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:22:39
as well as youre slicing
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b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:22:45
and that will cause less confusion
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b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:23:02
you need to visualize something like this on paper, basically
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b1196c3d84e34f30b15b36352d104419
264,472,398,596,669,440
chxn
03/17/2022 08:23:11
and yeah I don’t get how you got 4^2 - (4 - y^2)^2 still
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b1196c3d84e34f30b15b36352d104419
264,472,398,596,669,440
chxn
03/17/2022 08:23:44
I can do that but I don’t get how r = 4-y^2?
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b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:23:50
right ok
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b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:24:00
https://media.discordapp…20317-120930.jpg
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b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:24:07
Can you edit this picture
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b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:24:10
and mark on an R
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b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:24:12
and an r
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b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:24:16
for arbritrary y
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b1196c3d84e34f30b15b36352d104419
264,472,398,596,669,440
chxn
03/17/2022 08:25:11
Uhh i think ik what means but idk
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b1196c3d84e34f30b15b36352d104419
321,445,119,171,756,000
Shuri2060
03/17/2022 08:25:32
Say y = 1
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