Results 1 to 2 of 2

Math Help - volume

  1. #1
    n22
    n22 is offline
    Member
    Joined
    May 2013
    From
    england
    Posts
    100

    volume

    Hello,
    I have a quick question to ask. How do you find the angle for the bottom angle ( as in the one that goes only up to 0 to pi(which is max).
    I had a look at the solutions for this one apparently it goes from 0 to pi/4

    find the volume of the smaller of the two regions bounded by the sphere x^2+y^2+z^2=16 and the cone z=sqrt(x^2+y^2).

    thanks(im sorry if this looks familiar ..i def have not asked the above issue before)
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Apr 2005
    Posts
    15,412
    Thanks
    1328

    Re: volume

    In future, it would be helpful to tell us the situation you are looking at (here "find the volume of the smaller of the two regions bounded by the sphere x^2+y^2+z^2=16 and the cone z=sqrt(x^2+y^2)") first, then ask the question! Doing it the other way is confusing.

    The "bottom angle" is the angle at the vertex of the cone, correct? In the xz-plane (y= 0) z= sqrt(x^2+ y^2) becomes z= sqrt(x^2)= |x| and so is a pair of lines z= x for x non-negative and z= -x for x negative. Each of those makes an angle of pi/4 with the x-axis and pi/2 with each other.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: November 18th 2011, 01:08 PM
  2. volume flux, mass flux and volume flo
    Posted in the Advanced Applied Math Forum
    Replies: 2
    Last Post: June 7th 2011, 06:30 PM
  3. Replies: 1
    Last Post: May 14th 2010, 04:08 PM
  4. divergence = flux / volume is independant of the limiting volume
    Posted in the Differential Geometry Forum
    Replies: 0
    Last Post: April 26th 2010, 07:31 PM
  5. Volume Help
    Posted in the Geometry Forum
    Replies: 1
    Last Post: May 13th 2009, 05:23 AM

Search Tags


/mathhelpforum @mathhelpforum