Second order differential equation

  • Thread starter freeski
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  • #1
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Homework Statement


if given the general solution to a differential equation
y(t)=a cos t + b sin t + ((cos wt)/1-w^2),
Find out how long it takes the solution to approach the steady state solution.
original second order differential equation:
y'' + y = cos wt such that 0 < w < 10

Homework Equations





The Attempt at a Solution


I am not sure where to begin.

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
rock.freak667
Homework Helper
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So for y'' + y = cos wt

What is your homogeneous solution?

EDIT: Remember that your general solution will be y=yh+yss.
 
Last edited:
  • #3
35,052
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Homework Statement


if given the general solution to a differential equation
y(t)=a cos t + b sin t + ((cos wt)/1-w^2),
The good news is that you are being very diligent in your use of parentheses, but the bad news is that some of them aren't in the right place. You should write the last expression above as cos(wt)/(1 - w^2). As you have it, this expression would be read as cos(wt)/1 - (w^2), or cos(wt) - w^2, and I'm pretty sure that's not what you intended.
Find out how long it takes the solution to approach the steady state solution.
original second order differential equation:
y'' + y = cos wt such that 0 < w < 10

Homework Equations





The Attempt at a Solution


I am not sure where to begin.
A good start would be to find out what the term "steady state solution" means.
 

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