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Basic units question

  1. Feb 15, 2012 #1
    Ok for the life of me i cant remember how you get from say 15 miles per hour (15m/h) to 15mh-1?
  2. jcsd
  3. Feb 15, 2012 #2


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    Do you mean: 15 m/h to 15 m h-1?

    There is no conversion there, it's just a different way to write the same thing. Dividing by the power of a quantity is the same as multiplying by the negative power, so
    mi / h = mi h-1 (because you can read h as h1) and for example ft / s2 (as an acceleration) would be ft s-2.
  4. Feb 15, 2012 #3


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    really no where to go.

    [tex] \frac 1 x = x^{-1} [/tex]
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