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Special Relativity problem -- An electron travels at 0.422c...

  1. Mar 15, 2016 #1
    1. The problem statement, all variables and given/known data
    An electron travels at 0.422c. Calculate the following.
    (a) the relativistic momentum
    kg · m/s

    (b) the relativistic kinetic energy
    J

    (c) the rest mass energy
    J

    (d) the total energy of the electron
    J

    2. Relevant equations
    p= Ɣmu
    p= mv/ sqrt(1-v^2/c^2)

    3. The attempt at a solution
    a.
    p= 1/ sqrt(1-.422c/c^2) *(.422c)(0)
    = 5.51e-01
     
  2. jcsd
  3. Mar 15, 2016 #2
    use the rest mass of the electron to get correct momentum.
    write out the other relations/formula to calculate the other parameters.
     
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