Dont know whats wrong with my approach | Mathematics | Page 1

hazy crow Mar 5, 2024, 1:01 AM

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willow relicBOT Mar 5, 2024, 1:01 AM

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hazy crow Mar 5, 2024, 1:02 AM

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delicate wren Mar 5, 2024, 1:06 AM

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hazy crow

,rotate

serene raftBOT Mar 5, 2024, 1:06 AM

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delicate wren Mar 5, 2024, 1:07 AM

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hazy crow

Are you using the shell method?

hazy crow Mar 5, 2024, 1:07 AM

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no its surface area method

delicate wren Mar 5, 2024, 1:07 AM

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Oh surface right

delicate wren Mar 5, 2024, 1:09 AM

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serene raft

The first thing I see is since it's around the x-axis why did you solve for y?

hazy crow Mar 5, 2024, 1:10 AM

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i think i might have gotten confused and switched it around

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ill try to solve for x

serene raftBOT Mar 5, 2024, 1:10 AM

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adonhs

hazy crow Mar 5, 2024, 1:11 AM

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I appreciate it, ill try this out

delicate wren Mar 5, 2024, 1:11 AM

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https://youtu.be/lQM-0Nqs9Pg?si=_vR0ZdrUZGpKuD2I&t=825

YouTube

The Organic Chemistry Tutor

Surface Area of Revolution By Integration Explained, Calculus Probl...

This calculus video tutorial explains how to find the surface area of revolution by integration. It provides plenty of examples and practice problems finding the surface area generated by a region or curve when rotating about the x axis or y terms. This video provides the two integral formulas that you need and how describes how to find the ra...

▶ Play video

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haha

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Also for the derivative it's dx/dy

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You differentiate with respect to y

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reversed

hazy crow Mar 5, 2024, 1:11 AM

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thanks

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Got this but still dosent work

delicate wren Mar 5, 2024, 1:17 AM

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hazy crow Got this but still dosent work

,rotate

serene raftBOT Mar 5, 2024, 1:17 AM

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delicate wren Mar 5, 2024, 1:18 AM

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x = 10 + 3y²

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x' = 6y

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between 0 and 1

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You didn't evaluate the Integral?

hazy crow Mar 5, 2024, 1:20 AM

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no i plugged in claculator

delicate wren Mar 5, 2024, 1:21 AM

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What are you getting?

hazy crow Mar 5, 2024, 1:22 AM

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delicate wren Mar 5, 2024, 1:22 AM

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,w 2pi * Integrate[(10+3y²)Sqrt[1+(6y)^2],{y,0,1}]

serene raftBOT Mar 5, 2024, 1:23 AM

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Results provided by WolframAlpha

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delicate wren Mar 5, 2024, 1:23 AM

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Do you have to give in an approximate value?

hazy crow Mar 5, 2024, 1:24 AM

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no i need to plug in the full value

delicate wren Mar 5, 2024, 1:24 AM

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now that's weird

hazy crow Mar 5, 2024, 1:24 AM

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yeah it is

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and i cant use sinh

delicate wren Mar 5, 2024, 1:24 AM

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like 0.0001 more or less surface matters

hazy crow Mar 5, 2024, 1:25 AM

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yes

delicate wren Mar 5, 2024, 1:26 AM

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hazy crow

Did you type in this?

hazy crow Mar 5, 2024, 1:27 AM

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yes it did not work

delicate wren Mar 5, 2024, 1:34 AM

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hazy crow yes it did not work

You can't use sinh because you are not allowed to?

hazy crow Mar 5, 2024, 1:35 AM

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yeah

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Heres the notes they use in my class

📎 18_M_-_Surface_Area.pdf

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if it helps

delicate wren Mar 5, 2024, 1:42 AM

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hazy crow Heres the notes they use in my class

seems like you should use this

serene raftBOT Mar 5, 2024, 1:43 AM

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adonhs

hazy crow Mar 5, 2024, 1:45 AM

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ill try that out

delicate wren Mar 5, 2024, 1:45 AM

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oh i know the mistake we did

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Here the radius R(y) = y

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but we wrote instead of y we wrote 10 + 3y²

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Shouldn't look that complicated the result

hazy crow Mar 5, 2024, 1:52 AM

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i just tried it but that dosent work either

delicate wren Mar 5, 2024, 1:53 AM

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,w Integrate[2pi y Sqrt[1+(6y)^2],{y,0,1}]

serene raftBOT Mar 5, 2024, 1:53 AM

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Results provided by WolframAlpha

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hazy crow Mar 5, 2024, 1:55 AM

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It works man, I appreciate you with staying with me for this long

delicate wren Mar 5, 2024, 1:55 AM

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Well next time just use your professors papers

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.solved

#Dont know whats wrong with my approach