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Two events in spacetime

  1. May 12, 2013 #1
    The question...

    Two events are observed in a frame of reference S to occur at the same space point, with the second event occurring after a time of 1.70s. In a second frame S' moving relative to S, the second event is observed to occur after a time of 2.25 s.
    What is the difference Δx between the positions of the two events as measured in S'?

    I know that you guys like people to post their attempt at a solution, but I am legitimately lost and don't even know where to start :(
    All I've managed to work out is that for S', event 2 occured [tex]6.75*10^8[/tex]m away.

    Help would be much appreciated.
  2. jcsd
  3. May 12, 2013 #2
    You could start by writing down the relevant equations.
  4. May 12, 2013 #3
    That's the problem, I don't know which equations I need. Do I need time dilation? Do I need to consider length contraction? Do I need to use a Lorentz transformation on the coordinates of something? Do I need to get a Lorentz transformation of a velocity?

    I am completely lost with this question in every sense of the word.
  5. May 12, 2013 #4
    The problem is obviously talking about time between two events in one frame and in another frame. What equation is relevant there? What can you determine from it?
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