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Need, quick answer, please! Energy integral/derivative

  1. Sep 11, 2009 #1
    1. The problem statement, all variables and given/known data

    Start from this equation: E=(1/2)mvr^2+U(r)

    and solve for dt. Set up the integral to find the relation between r and t, then carry out the integral in the special case that E=0.


    2. Relevant equations



    3. The attempt at a solution
    HOW DO I GET DT? DO I HAVE TO TAKE THE DERIVATIVE OF THIS? IF SO, WITH RESPECT TO WHAT?

    THANKS!
     
  2. jcsd
  3. Sep 11, 2009 #2
    t is time, and I assume you are trying to prove that energy remains constant using vector calculus. v = dr/dt.
     
  4. Sep 11, 2009 #3
    i understand that dt is time, but now how to get dt.
     
  5. Sep 11, 2009 #4
    I told you v = dr/dt.

    I never went through all of this derivation, but I think that's the only dt there.
     
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