1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: Modern Physics (S. Theory of relativity) problem

  1. Sep 9, 2012 #1
    1. The problem statement, all variables and given/known data

    Find the force necessary to give a proton an acceleration of 1.0 10e19 m/s2 when the proton has the following velocities (along the same direction as the force).

    2. Relevant equations
    P=mλu


    3. The attempt at a solution
    Found the derivative of the above equation and got F=mλa, but my answers are been rejected by the school software. I don't know what I did wrong please help.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Sep 9, 2012 #2

    TSny

    User Avatar
    Homework Helper
    Gold Member
    2017 Award

    The gamma factor λ depends on u. Since p is proportional to the product of λ and u, you'll need to use the product rule when taking the derivative dp/du in the expression F = dp/dt = (dp/du)(du/dt)
     
    Last edited: Sep 9, 2012
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook