Results 1 to 5 of 5

Math Help - [SOLVED] Please help me in this Laplace transform question!!!

  1. #1
    Newbie
    Joined
    Jul 2009
    Posts
    11

    [SOLVED] Please help me in this Laplace transform question!!!

    It has to be solved by using convolution theorem :



    i try to separate them into 3 parts :

    1/s , 1/s^2 , 1/(s-3) but failed to get the correct answer.


    May i know the correct way to solve this question ?

    Thank a lots for the reply.
    Last edited by mr fantastic; April 18th 2010 at 12:35 AM. Reason: restored original question
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Mar 2010
    From
    Florida
    Posts
    3,093
    Thanks
    5
    Quote Originally Posted by Zachary View Post
    It has to be solved by using convolution theorem :



    i try to separate them into 3 parts :

    1/s , 1/(s-3) , 1/(s-3) but failed to get the correct answer.

    May i know the correct way to solve this question ?

    Thank a lots for the reply.
    When doing partial fractions, you should have
    \frac{A}{s}+\frac{B}{s^2}+\frac{C}{s-3}.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Jul 2009
    Posts
    11
    but it should be solved by using convolution theorem right ?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    Joined
    Mar 2010
    From
    Florida
    Posts
    3,093
    Thanks
    5
    In order for you to separate that fraction, you have to use partial fractions.

    Try combining your 3 fractions into to 1 to see if you obtain \frac{1}{s^2(s-3)}
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by Zachary View Post
    It has to be solved by using convolution theorem :



    i try to separate them into 3 parts :

    1/s , 1/(s-3) , 1/(s-3) but failed to get the correct answer.

    May i know the correct way to solve this question ?

    Thank a lots for the reply.
    Read this: Convolution for Laplace Transform

    h(t) = LT^{-1}\left[\frac{1}{s^2} \right] * LT^{-1}\left[\frac{1}{s-3} \right].

    If you need more help, please show what you've done and say where you get stuck.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Laplace Transform Question`
    Posted in the Differential Equations Forum
    Replies: 27
    Last Post: September 2nd 2010, 05:57 PM
  2. [SOLVED] inverse of a laplace transform
    Posted in the Differential Equations Forum
    Replies: 2
    Last Post: April 22nd 2010, 09:11 AM
  3. Laplace transform question
    Posted in the Differential Equations Forum
    Replies: 2
    Last Post: April 21st 2010, 07:15 PM
  4. Please help me in this Laplace transform question #2.
    Posted in the Differential Equations Forum
    Replies: 1
    Last Post: April 18th 2010, 12:29 AM
  5. [SOLVED] [SOLVED] Laplace transform for error function !
    Posted in the Advanced Applied Math Forum
    Replies: 1
    Last Post: June 13th 2007, 11:18 AM

Search Tags


/mathhelpforum @mathhelpforum