Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Mastering physics help - rail gun

  1. Sep 2, 2010 #1
    1. The problem statement, all variables and given/known data

    attached

    2. Relevant equations



    3. The attempt at a solution
    I think i need to use energy methods for this because the acceleration is not constant..
    trouble is I don't know the formula for the potential energy in cases like this.

    Thanks for any help.
     

    Attached Files:

    • PFMP.jpg
      PFMP.jpg
      File size:
      21.3 KB
      Views:
      395
  2. jcsd
  3. Sep 2, 2010 #2

    Redbelly98

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    What's the force on a current-carrying wire in a magnetic field? (There is a formula for it.)
     
  4. Sep 2, 2010 #3
    F=BIL thats how i found the acceleration.. but i dont see how that helps with b??
     
  5. Sep 2, 2010 #4
    how was this current produced in the first place? What kind of current are you dealing with?
     
  6. Sep 2, 2010 #5
    I dont know what you mean???? it was supplied by a cap if that helps?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook