Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Integral rotation

  1. Sep 11, 2012 #1
    1. The problem statement, all variables and given/known data
    Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified line. Sketch the region, the solid, and a typical disk or washer.

    [tex]y=1+sec x[/tex] [tex]y=3[/tex] about [tex]y=1[/tex]

    2. Relevant equations

    3. The attempt at a solution
    I don't understand how to do this since y=3 crosses at infinite points. I know that is crosses at -∏/3 and ∏/3.
  2. jcsd
  3. Sep 11, 2012 #2


    Staff: Mentor

    My guess is that the region to be rotated around the line y = 1 is just a single arch of the graph of y = 1 + sec(x), up to the line y = 3. The problem should have been more specific in describing the region, IMO.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook