- #1
jianxu
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Homework Statement
Hi, so the initial problem was:
given [tex]\left.\frac{d^{2}u}{dt^{2}} = \frac{d^{2}u}{dx^{2}}}[/tex]
[tex]\left.-\infty \leq x \leq \infty[/tex]
[tex]\left.u(x,0)=\frac{x}{1+x^{3}} , \frac{du}{dt}(x,0) = 0[/tex]
Solve the PDE(did this part already) and plot the solution for -20 < x <20 and t = 0,1,2,...10
Homework Equations
The Attempt at a Solution
So I've already solved for the PDE which came out to be:
[tex]\left.u(x,t) = \frac{x}{2(1+(x-t)^{3})}+ \frac{x}{2(1+(x+t)^{3})}[/tex]
I am having trouble understanding the implications of the plots though. I've attached images of the several plots(included t = 0, t = 2, t = 4 since they're all the same except the x position of the line decreases with an increase in t)
Does this mean for each t there is only one location it can be in? It seems strange because we've been doing wave motion and this doesn't look like a wave so...Thanks!
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