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Homework Help: Restriction on K

  1. Jul 31, 2010 #1
    I have a function that states:

    [tex]e^{\frac{-t}{k}}\sin2t[/tex].

    With the restriction k>1. There shouldn't be a dot next to the t.

    I am meant to figure out why k is always bigger than one but so far, I am hatting a brick wall. Obviously, zero doesn't work because it yields a math error but the other decimals such as 0.9 or 0.8 can be graphed perfectly.

    Could someone please give me any hints? I am thinking it might have something to do with time now but I am still blank.
     
  2. jcsd
  3. Jul 31, 2010 #2
    You can graph them, but maybe there is some other reason why k is restricted to > 1? Maybe a physical reason? What is the context?
     
  4. Jul 31, 2010 #3
    It's related to harmonic motion (that is the actual context). I was thinking that perhaps it has something to do with a physical aspect. However, the harmonic motion equation (simple) is slightly different to this, so I didn't really pursue the idea further.
     
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