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Homework Help: Force on protons

  1. May 16, 2008 #1
    1. The problem statement, all variables and given/known data
    The problem states that two protons are aimed at each other with a certain velocity v. It asks what is the maximum electrical force they will exert on each other.
    The velocity is given at 1000km/s. And that is everything given.

    2. Relevant equations
    KE = 1/2mv^2
    F = q*q/(4*pi*e*r^2)

    3. The attempt at a solution
    I am stuck on the approach. I have managed to find the kinetic energy of the protons but that is it. I don't know where to go from here . I think I should use Coulomb's Law, but I need to find the radius for that. Any suggestions?
  2. jcsd
  3. May 16, 2008 #2

    Doc Al

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    Staff: Mentor

    Hint: What can you say about the KE of the protons when they reach the minimum separation distance?
  4. May 16, 2008 #3
    Great Help! Thank you very much, problem Solved.
  5. May 16, 2008 #4


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Just on a hunch, I'll ask if the total kinetic energy of the two protons was included in the problem solution.
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