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Homework Help: Translate into scientific notation?

  1. Mar 12, 2007 #1
    I pretty much know how to solve this problem, but I have a simple question.

    The question asks a charge of +45 uC (u is coefficient of friction and C is Columb). Now what would that translate into scientific notation?

    Because I know 3 uC equals 3.0 x 10^-6, but what about double figures? Thanks
     
  2. jcsd
  3. Mar 13, 2007 #2

    Kurdt

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    Well you could write it as 45 x 10-6. standard notation would be 4.5 x 10-5. The mu in the units has nothing to do with the coefficient of friction. It denotes micro which means 1 x 10-6 times the units. In your question for example the units are microcoulombs which are 1 millionth of a coulomb. A micrometer is 1 millionth of a meter.
     
  4. Mar 13, 2007 #3
    why does 3uC equal 3 x 10^-6?
     
  5. Mar 13, 2007 #4

    Kurdt

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    Like i've said the u (mu) that joins onto the units means that they are a millionth of a Coulomb. So in SI units 3uC are 3x10-6 Coulomb's. It makes it easier to write down small and large numbers because you don't have to add the x10 stuff.
     
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