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Homework Help: This problem is killing me - literally

  1. Apr 12, 2008 #1
    Duck season has arrived. A Harlequin duck (Histrionicus histrionicus) is bobbing vertically up and down due to a passing water wave. The duck bobs through a total vertical distance of 10.0 cm and completes 7.03 cycles during 10.4 s according to your Mickey Mouse watch. You also note that a particular crest of the wave travels the 8.99 m from the duck to your canoe during 5.05 s.

    (a) What is the frequency of the water wave?
    (b) What is the speed of the wave?
    (c) What is the wavelength of the waves?
    (d) Write a mathematical expression for the wavefunction (x, t) assuming it is a sinusoidal wave with the duck located at the origin for x and at a peak of the wave when t = 0 s.
    (x, t) = cos( x - t)


    Please explain as well, don't just calculate. Thanks.
  2. jcsd
  3. Apr 12, 2008 #2
    You are given so many cycles in so many seconds. What's that number in units of cycles per second?

    You are given so many meters in so many seconds. What's that number in units of meters per second?

    What vocabulary words are the names of the above variables?

    What formula relates them to the wavelength?
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