1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Axis of revolution-washer/disks

  1. Jul 5, 2013 #1

    emk

    User Avatar

    Y=x^2, y=0, x=1 ; about x=2

    v=pi r^2 T

    I tried 0 to 1 intg (x^3-2)^2+2^2 dx, but it wasn't right. Not sure what to do.
     
  2. jcsd
  3. Jul 5, 2013 #2

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    We're not sure what you are doing, either.

    Use the homework template and give a complete problem statement.
     
  4. Jul 5, 2013 #3
    It may help to break that thing up into two different integrals. The thing is shaped like a circus tent. That is, a cylinder with a spire on top. The cylinder integration can be done without calculus. Then do the spire part using your books formula (the formula for volume basically) and add the two.
     
  5. Jul 5, 2013 #4

    verty

    User Avatar
    Homework Helper

    I see no spire on top, just an oddly-shaped cylinder.
     
  6. Jul 5, 2013 #5

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    QuarkCharmer's description makes sense to me. The point of the spire is at x=2, the axis of revolution. But the washer method just seems to complicate matters. emk, were you told to use that method here?
     
  7. Jul 5, 2013 #6

    emk

    User Avatar

    Yes, either the disk or washer method.
     
  8. Jul 5, 2013 #7
    Unless I am mistaken:

    mwttz8.jpg
    You could easily find all these intersection points, and rewrite the equation to integrate such that the integration makes more sense to you.

    Hope that is helpful.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Axis of revolution-washer/disks
  1. Disk and washer method (Replies: 2)

  2. Disk Washer Method (Replies: 14)

Loading...