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Homework Help: Simple Harmonics Problem

  1. Feb 24, 2008 #1
    1. The problem statement, all variables and given/known data
    A SHM motion can be described by a=-400x. The amplitude is 8cm. Find the displacement and acceleration at a time of 2s.

    2. Relevant equations
    x = A sin(2pi f t)
    x = A cos(2pi f t)
    a=-(2pi f)squared*x

    3. The attempt at a solution
    Firstly I realised that 400=2pi f , so f =64Hz. But then I go stuck cos you don't know if this is a cos or sin oscillation. Im not sure where to go from here, but I just know theres a way around this.

    Any help?
  2. jcsd
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