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Homework Help: Dimensional analysis equation help

  1. Oct 27, 2007 #1
    y = (2m) cos (kx), where k = 2 m^-1

    it says that the equation is dimensionally correct but i dont understand why...
  2. jcsd
  3. Oct 27, 2007 #2


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    I'll assume y is a distance, such as the position of a point on a wave. Consider this:

    What are the units of all the terms in the equation? i.e. the units of the 2 outside the cosine, and the units of what is in the cosine argument.

    Using dimensional analysis, what are the units of y?
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