- #1
1MileCrash said:Homework Statement
attached
Homework Equations
The Attempt at a Solution
Is the correct answer a choice?
I get Q= .17e-6cos(4000t), every single time.
1MileCrash said:Q'' + 4e6Q = 0 =>
r^2 + 4e6 = 0 (characteristic equation) => r = 0 +/- 4000i
=> Q = c1cos(4000t) + c2sin(4000t)
=> Q' = -4000c1sin(4000t) + 4000c2cos(4000t)
=> Q(0) = c1 = .17e-6
=> Q'(0) = 4000c2 = 0 => c2 = 0
So
Q = .17e-6cos(4000t)
Dick said:The square root of 4e6 is 2000, not 4000.
1MileCrash said:I'm confused. Why would I be taking the square root of 4e6?
Shouldn't I be taking the square root of b^2 - 4(a)(c)?
Which is 0 - 4(1)(4e6) = 16000000, and the square root of that is 4000.
Thanks
Dick said:You don't NEED to use the quadratic formula to solve r^2+4e6=0, but if you do you shouldn't forget there is a 2a in the denominator.
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