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Need help with Laplace transformations

  1. May 24, 2009 #1
    I need help with calculation of several Laplace transformations. I'm not sure about following word expressions, which I'll use, as english is not my mother tongue, but I hope It will be understandable.


    1. Find transformation to this object:
    [tex]f(t) = 3t\sinh^2t - 4\int_{0}^{t}(e^s \cos hs - s^5e^3s - 1)ds[/tex]
    I got this result, but I'm not sure about it
    [tex]F(p) = \frac{1}{p} - \frac{6p}{(p^2-1)^4} - 4(\frac{p-1}{(p-1)^2-1} - \frac{5}{(p-3)^6} - \frac{1}{p})[/tex]


    2. Find transformation to this object:
    [tex]f(t) = \int_{0}^{t}(4-6s\cos^23s+8\sin2s\cos2s)ds-3\frac{d}{dt}[te^{-2t}\sin3t+\cos^22t][/tex]


    3. Find source object f(t) related to this transformation:
    [tex]F(p) = \frac{p+1}{p^2-2p+2}[/tex]


    4. Find source object f(t) related to this transformation:
    [tex]F(p) = \frac{5p(1-e^{-\frac{\pi}{2}p})}{(p+1)(p^2+4)}[/tex]


    5. Find transformation of periodic function f(t), where
    [tex]f_T(t)=\left\{\begin{array}{cc}3,&\mbox{ if }
    t\epsilon \left\langle0,\frac{\pi}{8}\right)\\\sin4t, & \mbox{ if } t\epsilon \left\langle \frac{\pi}{8},\frac{\pi}{2}\right)\end{array} T=\frac{\pi}{2}[/tex]


    6. Find source object f(t) related to this transformation:
    [tex]F(p) = e^{-\pi p} \frac{8}{p(p^2+4)} - \frac{2p^2-2p+8}{p(p^2+4)}[/tex]



    *** do I consider it right, that 1,2,5 are normal Laplace transformations and 3,4,6 are the inversed ones ?

    Are they not too wild for homework or is this just my feeling ? I'm quite lost in them. Can you help me calculating and explaining the procedure ? I would appreciate any little effort on this. Is here somebody who could help me with this in next 3 hours ? I need to have it done until tomorrow. hmmm

    BIG Thanks in advance

    Luana
     
    Last edited: May 24, 2009
  2. jcsd
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