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: Acceleration of Protons and Electrons at a certain distance provided.

  1. Jan 18, 2009 #1
    1. The problem statement, all variables and given/known data
    If a proton and an electron are released when they are 8.00×10e-10 m apart (typical atomic distances), find the initial acceleration of each of them.

    2. Relevant equations

    F=ma
    F=kq1q2/re2
    F=kee2/r2

    3. The attempt at a solution

    Since r=8x10e-10, I solved for the force, because the charge between proton and electron will be the same. From that I got 2.88x10e-10. Then, using F=ma, I divided the force by the mass of the electron (9.10 x 10e-31) and got 3.16x10e11. This was wrong so I am stuck here...
     
  2. jcsd
  3. Jan 18, 2009 #2
    Bump please!!
     
  4. Jan 18, 2009 #3

    Dick

    User Avatar
    Science Advisor
    Homework Helper

    The method looks right. I'm not getting the same numbers as you are though. If you get something like e-10 for force and divide by e-31 for electron mass it's nowhere near e11.
     
  5. Jan 18, 2009 #4
    Sorry, I meant 3.16 x 10e20. Still isn't correct though.
     
  6. Jan 18, 2009 #5
    Ack! Silly me! My calculator was set up incorrectly! I fixed it!

    Thank you for helping me understand that I was doing it correctly though!
     
  7. Jan 18, 2009 #6

    Dick

    User Avatar
    Science Advisor
    Homework Helper

    I was going to suggest you check the calculator batteries, F wasn't right either.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook