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Homework Help: Basic Relativity Stuff

  1. Jun 9, 2008 #1

    bfr

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    1. The problem statement, all variables and given/known data

    I'm trying to find out how to use the formula t'=t*sqrt(1-v^2 / c^2) for time dilation.

    For example, if object A were moving .8c and object B were moving .6c, would I do .8c-.6c=.2c, and substitute that in for v in the time dilation formula to find the time object B observes for object A?

    2. Relevant equations

    t'=t*sqrt(1-v^2 / c^2)
    v'=(u+v)/(1+(u*v)/c^2)
     
  2. jcsd
  3. Jun 9, 2008 #2

    Dick

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    Homework Helper

    To find the relative velocity you need to use the relativistic law for adding velocities. You don't just add or subtract the velocities. You quoted the formula. Now use it.
     
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