My Math Forum  

Go Back   My Math Forum > College Math Forum > Calculus

Calculus Calculus Math Forum

LinkBack Thread Tools Display Modes
March 8th, 2009, 10:55 AM   #1
Joined: Mar 2009

Posts: 5
Thanks: 0

Using the washer/shell/disk when solving in terms of y.

I have an exam in two days and we got our practice exam. He put something on there that always throws me off!
I am a very visual person and when I do problems with the washer/shell/disk integration, I always graph what I have before solving.
When I get a problem that is in terms of y, I always get thrown since I can't really graph it. My question is, what are YOUR steps (simple please) in solving a problem like this one:

x = y^2+1 and x = 5
set up an integral for the volume of the solid if it's rotated around x = -1.

Any way to graph using my calculator in terms of y? I guess that's what is throwing me off.
inspiration100 is offline  
March 8th, 2009, 12:11 PM   #2

Posts: n/a

Re: Using the washer/shell/disk when solving in terms of y.

You can use washers or shells.

When we use shells, the cross sections are parallel to the axis about which we are revolving. Since we are revolving about x=-1, the cross sections will be 'stacked up' along the x-axis. Solve your equation for y in terms of x.



  My Math Forum > College Math Forum > Calculus

solving, terms, washer or shell or disk

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
Disk/Washer Integration with ln function brsystem Calculus 4 September 16th, 2012 08:20 PM
Help solving for variable in terms of other variables Messerschmitt Algebra 3 September 1st, 2012 07:35 AM
Difference between Disk/Washer and Cylindrical Shells Obsessed_Math Calculus 4 July 6th, 2012 09:36 PM
Volume Disk vs Shell Method hackedx Calculus 1 February 13th, 2011 06:03 PM
solving y=tanh(y-x) in terms of x cluelessengineer Abstract Algebra 1 March 9th, 2010 02:40 PM

Copyright © 2017 My Math Forum. All rights reserved.