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Homework Help: Any ideas?

  1. Sep 27, 2004 #1
    The position of a mass m = 24 kg is given (in m) by x(t) = 7sin(5t). Calculate the magnitude of the maximum force acting on the mass.

    All I know is that double prime equals acceleration, but I'm not even sure it that will help me solve the problem.

    Anyone have any suggestions?
  2. jcsd
  3. Sep 27, 2004 #2
    Right...x'' is acceleration. And from that [tex]F = ma = mx''[/tex]. All you have to do is find at what time(s) x'' is at its maximum value. Hint: The maximum value of [tex]sin t[/tex] or [tex]cos t[/tex] is 1.
  4. Sep 27, 2004 #3
    I got x'' to equal -.053308sin(5t) then at maximum height t equals 54, but y doesn't equal 1.

    What did I do wrong?
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