Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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Transcribed Image Text:Consider the initial value problem
where g(t) =
ft
10
if 0 < t <3
if 3 < t < 0.
y" + 4y = g(t),
-3e^(-3s)/s-e^(-3s)/s^2+1/s^2
y(0) = 0, y'(0) = 0,
a. Take the Laplace transform of both sides of the given differential equation to create the corresponding algebraic
equation. Denote the Laplace transform of y(t) by Y(s). Do not move any terms from one side of the equation to the
other (until you get to part (b) below).
=
(-3s-1)/s^2e^(-3s)+1/s^2
(formulas)
b. Solve your equation for Y(s).
Y(s) = L{y(t)} = -(3s+1)/s^2(s^2+3)e^(-3s)+1/(s^2(s^2+3))
c. Take the inverse Laplace transform of both sides of the previous equation to solve for y(t).
y(t) = 1/4(t-sin(2t)/2)
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