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Relativity and energy (think its dead easy, I just can't see it!)

  1. May 30, 2007 #1
    1. The problem statement, all variables and given/known data
    A proton has total energy 2GeV and is travelling along the x-axis. A photon with energy 50MeV travels at an angle of 45 degrees to this axis. What is the total energy and momentum of the system?


    2. Relevant equations
    Non-really


    3. The attempt at a solution
    Total E = 2Gev + 50 MeV = 2.05GeV yes? I don't need to take any directions into account here do I?

    Then px = p(proton) + px(photon), and py = py(photon) yes?
     
  2. jcsd
  3. May 30, 2007 #2

    Dick

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    Science Advisor
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    Yes, that's it.
     
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