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Homework Help: Work Needed to Increase Electron Speed

  1. Nov 28, 2006 #1
    1. The problem statement, all variables and given/known data
    How much work must be done to increase the speed of an electron from rest to 0.52c?


    2. Relevant equations
    I don't know :)


    3. The attempt at a solution
    I tried E=Ymc^2 where Y = 1/[1-(v/c)^2]^1/2 and got 3.19821x10^-22 J which translates to 1.998x10^-9 MeV, but I don't think this answer is right. Could someone explain this one to me? Thanks!! :biggrin:
     
  2. jcsd
  3. Nov 28, 2006 #2
    Work = change in energy.

    Does that help?
     
  4. Nov 28, 2006 #3
    Oh, duh! I feel stupid lol.. I got it now. Thanks!! :blushing:

     
  5. Nov 28, 2006 #4
    No problem. I love helping people feel stupid :)
     
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