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Finding velocity from Joules

  1. Jul 23, 2008 #1
    A proton with a kinetic energy of 4.6×10−16 J moves perpendicular to a magnetic field of 0.26 T. What is the radius of its circular path?


    I know the formula is r=mv/qb. the only thing not given is v. So my question is how do I get v from Joules? I know 1 Joule=1N/m, and that N=ma, but I dont know how to get velocity from that. Any help on that part would be greatly appreciated : )
     
  2. jcsd
  3. Jul 23, 2008 #2

    Doc Al

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    Staff: Mentor

    What's the definition of kinetic energy?
     
  4. Jul 23, 2008 #3
    1/2 mv^2
     
  5. Jul 23, 2008 #4

    Doc Al

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    Staff: Mentor

    There you go. Now you can solve for v using the given information. (You may have to look up the mass of a proton.)
     
  6. Jul 23, 2008 #5
    thanks!
     
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