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Help finding maximum value

  1. Nov 22, 2011 #1
    this here is the problem....

    Use the equations below. (Note that the direction is indicated by the sign in front of the equations.)
    x = (0.0553 m) cos(4.094t + 0.14π)

    v = −(0.226 m/s) sin(4.094t + 0.14π)

    a = −(0.927 m/s2) cos(4.094t + 0.14π)

    (a) Determine the first time (t > 0) that the position is at its maximum (positive) value.

    (b) Determine the first time (t > 0) that the velocity is at its maximum (positive) value.

    i have no idea where to start, or how to do this.
  2. jcsd
  3. Nov 22, 2011 #2
    Position is given by x.

    At what angle is the cos(...) maximum?
  4. Nov 22, 2011 #3
    they didnt give an angle. but I'm guessing since we want x to equal what ever number is there, then cos must equal 1 right?
  5. Nov 22, 2011 #4
    so (0.0553 m) cos(4.094t + 0.14π) is max when cos(4.094t + 0.14π) = 1

    that is when (4.094t + 0.14π) = ....?
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