What Went Wrong with My Laplace Circuit Problem?

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The discussion centers on a Laplace circuit problem where the user correctly identified the denominator but struggled with the numerator, indicating an issue with the circuit's sources. They suggested a method for resolving such problems by converting Laplace equations to differential equations while ignoring initial conditions, then reverting to the Laplace domain with proper initial condition rules. The user ultimately resolved their issue, implying that their approach was effective. Clear communication of circuit details is emphasized as crucial for troubleshooting. The thread highlights the importance of understanding both Laplace transforms and initial conditions in circuit analysis.
NewtonianAlch
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Homework Statement


http://img836.imageshack.us/img836/9994/27794040.jpg

The Attempt at a Solution



Here is the circuit I re-drew:
http://img403.imageshack.us/img403/6752/dsc0048ga.jpg

Working out:

http://img857.imageshack.us/img857/5633/dsc0049mo.jpg

I got the denominator correct, but my numerator isn't. Which means I got something wrong with the sources in the circuit, but I'm not sure where.
 
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It's hard to read your paper. I can only offer you what I do in cases like this where initial conditions exist:

1. Change the Laplace equations to differential equations, ignoring the initial conditions.

2. Change the differential equations back to Laplace domain, using the Laplace transform rules for including initial conditions, e.g.
if F(s) = L{f(t)} then L{f'(t)} = sF(s) - f(0+) etc.

3. Then do the inverse transforms term-by-term.

This is probably equivalent to what you're trying to do, I can't tell.
 
Nvm, solved.
 
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