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Homework Help: SHM problem

  1. Nov 10, 2004 #1
    I have no idea why I can not get this question, but here it is:

    A brick is resting atop a piston that is moving vertically with simple harmonic motion of period 1.19 s. At what amplitude will the brick separate from the piston?

    I know that once the acceleration is greater than that of gravity the 2 will seperate.

    I tried using the equation:
    a(t)=-w^2Acos(wt+phi) a=-9.8 w=2pi/T phi=pi and t=T

    Where am I wrong on this question?
    Any help would be greatly appreciated! Thanks
  2. jcsd
  3. Nov 10, 2004 #2

    Doc Al

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    Staff: Mentor

    You are on the right track. What's the equation for y(t)?
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