Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Basic Relativity Stuff

  1. Jun 9, 2008 #1


    User Avatar

    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)
  2. jcsd
  3. Jun 9, 2008 #2


    User Avatar
    Science Advisor
    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook