1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: Confusion in special relativity - total newbie

  1. Mar 8, 2008 #1
    I'm sure it's a stupid question but this is my first crack at SR so help would be great.

    1. The problem statement, all variables and given/known data
    Frame S' has a speed of 0.7c along the x axis relative to frame S. Clocks are adjusted so t=t'=0 at x=x'=0.

    An even occurs in S at t1 = 3 x 10^7s at x1 = 40m. At what time does the event occur in S'?

    2. Relevant equations
    [tex]\beta = 0.7[/tex]
    [tex]\gamma = 1.4003[/tex]
    [tex]x' = \gamma (x - t\beta c)[/tex]

    3. The attempt at a solution

    [tex]x' = \gamma (x - t\beta c) = (1.4003)(40 - (3 * 10^7)0.7 c) = -32.21m[/tex]

    Is this answer correct? It seems to me it can't possibly be right! What am I doing wrong?
  2. jcsd
  3. Mar 8, 2008 #2

    Shooting Star

    User Avatar
    Homework Helper

    Why do you think this cannot be right? Think of where the origin of S' is wrt S when the event happens.

    BTW, you have a direct formula for finding the time, which is the actual question.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Similar Threads for Confusion special relativity Date
Subtracting gravity? Apr 17, 2018
Pulse repetition frequency ultrasound confusion Mar 10, 2018
Confused: vector or scalar Feb 20, 2018
Special Relativity Energy Problem a little confused! Sep 18, 2012
Confused about Special Relativity Mar 18, 2008