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Homework Help: Sinusoidal Waves

  1. Oct 8, 2005 #1
    At a certain instant, a point A is at the origin and a point B is the first point on the x-axis that is 60° out of phase. What is the coordinate of B?

    The equation of the wave is given as:
    y = (15.0 cm)cos(0.157x-50.3t)
     
  2. jcsd
  3. Oct 8, 2005 #2

    SpaceTiger

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    Hint:

    [tex]y = A cos(kx+\omega t)[/tex]

    where A is the amplitude of the wave, k is the wavenumber, and [itex]\omega[/itex] is the angular frequency. The latter two are given by

    [tex]k=\frac{2\pi}{\lambda}[/tex]
    [tex]\omega=\frac{2\pi}{T}[/tex]

    where T and [itex]\lambda[/itex] are the period and wavelength. What fraction of a wavelength is between the two points?
     
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