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Homework Help: Phase constant of SHM homework

  1. Nov 3, 2007 #1
    The graph shows the position x of an oscillating object as a function of time t. The equation of the graph is x(t)=Acos(wt + [tex]\phi[/tex])
    where A is the amplitude, w is the angular frequency, and [tex]\phi[/tex] is a phase constant. The quantities M,N, and T are measurements to be used in your answers.

    See attached image.

    What is [tex]\phi[/tex] in the equation?

    Attached Files:

  2. jcsd
  3. Nov 3, 2007 #2
    can anyone help me?
  4. Nov 3, 2007 #3


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    Staff Emeritus
    Science Advisor

    The attachment has to be approved, but the phase angle (constant) is found for example when t = 0, and knowing x(t=0) = A cos [itex]\phi[/itex], or

    [itex]\phi[/itex] = cos-1 (x(0)/A), or

    if x(t) is known at t, then

    [itex]\phi[/itex] = cos-1 (x(t)/A) - wt
  5. Jan 11, 2011 #4
    the answer leads to 0.5pi.
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