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Homework Help: Equation of Motion

  1. Feb 5, 2008 #1
    1. The problem statement, all variables and given/known data

    A sin (wt + [tex]\Phi[/tex]) = 0
    Find A and [tex]\Phi[/tex]

    2. Relevant equations

    Asin(wt)cos[tex]\Phi[/tex] + Acos(wt)sin[tex]\Phi[/tex] = 0

    3. The attempt at a solution

    I was told to use magnitude to figure out A and something else to find [tex]\Phi[/tex] in variable.
    I absolutely have no idea what to do...
    I found a part of solution, which got me w and I am expected to solve for A and [tex]\Phi[/tex] with that given equation.

    I tried to use original equation by plugging in t = 0 for A sin (wt + [tex]\Phi[/tex]) and first and second derivative from original equation.

    I think once I get those A and [tex]\Phi[/tex], I "might" be able to solve entire problem.

    Thank you.
  2. jcsd
  3. Feb 5, 2008 #2
    is there missing info or ?
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