Results 1 to 7 of 7

Thread: find the volume

  1. #1
    Newbie
    Joined
    Sep 2009
    Posts
    9

    find the volume

    The region enclosed by the cone z2 = x2 + y2 between the planes z = 5 and z = 7
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Apr 2005
    Posts
    18,188
    Thanks
    2424
    Quote Originally Posted by Naseef View Post
    The region enclosed by the cone z2 = x2 + y2 between the planes z = 5 and z = 7
    Okay, what is your difficulty? That looks like a pretty easy question. I would be inclined to use cylindrical coordinates because then z^2= x^2+ y^2 becomes just z= r.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Sep 2009
    Posts
    9

    the answer

    the book say the answer is 228.28 but i never came out with this answer
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Eater of Worlds
    galactus's Avatar
    Joined
    Jul 2006
    From
    Chaneysville, PA
    Posts
    3,002
    Thanks
    1
    Here it is in spherical. You did not state if you had to use a particular method.

    \int_{0}^{2\pi}\int_{0}^{\frac{\pi}{4}}\int_{5sec{  \phi}}^{7sec{\phi}}{\rho}^{2}sin{\phi} \;\ d{\rho}d{\phi}d{\theta}
    Follow Math Help Forum on Facebook and Google+

  5. #5
    MHF Contributor

    Joined
    Apr 2005
    Posts
    18,188
    Thanks
    2424
    Quote Originally Posted by Naseef View Post
    the book say the answer is 228.28 but i never came out with this answer
    I ask again- what is your difficulty? You say you did not come out with 228.28. Well, good for you- the answer is NOT 228.28! Did you come out with something? Please show what you did.

    (I think the problem is far simpler in cylindrical coordinates than spherical coordinates.)
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Eater of Worlds
    galactus's Avatar
    Joined
    Jul 2006
    From
    Chaneysville, PA
    Posts
    3,002
    Thanks
    1
    (I think the problem is far simpler in cylindrical coordinates than spherical coordinates.)

    Yes, it is indeed. Just showing another way to do it.
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Newbie
    Joined
    Sep 2009
    Posts
    9

    my answer

    456.58 could you please show the limit in cylindical coordiate so that i cam compare with my answer plz?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: Jul 5th 2010, 08:48 PM
  2. Find volume
    Posted in the Calculus Forum
    Replies: 0
    Last Post: Feb 23rd 2010, 05:47 PM
  3. Find a volume
    Posted in the Calculus Forum
    Replies: 10
    Last Post: Jul 22nd 2009, 03:38 AM
  4. Find a volume
    Posted in the Calculus Forum
    Replies: 12
    Last Post: Jun 16th 2009, 06:14 PM
  5. How to find this volume?
    Posted in the Calculus Forum
    Replies: 1
    Last Post: Nov 3rd 2008, 08:53 AM

Search Tags


/mathhelpforum @mathhelpforum