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Homework Help: Relativistic Velocity (special relativity) completely lost

  1. Sep 11, 2012 #1
    1. The problem statement, all variables and given/known data

    You fire a light signal at 60° north of west. (a) find the velocity components of this signal according to an observer moving eastward relative to you at 0.5c. From them, determine the magnitude and direction of light signal's velocity according to the other observer. (b) find the components according to a different observer, moving westward relative to you at 0.5c.

    2. Relevant equations

    U'= (u-v)/(1-uv/c)
    U= (u+v)/(1+uv/c)

    3. The attempt at a solution

    These are the only two formulas that I could think to use, but Im not sure how to incorporate the angle? It's throwing me off of the whole problem. Any help or explanation would be so much appreciated, thank youu!
  2. jcsd
  3. Sep 11, 2012 #2
    Would I use the speed of light for the hypotenuse of my triangle, since it says I'm firing a light signal, and then use simple trig, i.e. Csin60=y for my y-component? I'm really unsure.
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