1. Not finding help here? Sign up for a free 30min 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!

Revolutions problem

  1. Oct 17, 2004 #1
    An electron of mass (m=9.1*10^(-31)kg) orbits a proton at a distance of 5.3*10^(-11)m. The proton pulls on the electron with an electric force of 9.2*10^(-8)N.
    How many revolutions per second does the electron make?

    This is what I did:

    m=9.1*10^(-31)kg
    v=5.3*10^(-11)m
    T=9.2*10^(-8)N

    V=sqrt(rT/m)= 23147876.27 m/s

    angular velocity (w) = (v/r) = 4.38^(16) rad/s
    w*(1 rev/(2(pi)rad)) = 9.17*10^9 rev/s

    I was told the answer was wrong.
    Please help
     
  2. jcsd
  3. Oct 20, 2004 #2
    The electrostatic force serves as the centripetal force. It is given by F = mrw^2. Once w has been determined, w/(2 pi) will be the frequency.

    Best regards,
    Kenneth
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Revolutions problem
  1. Revolutions Help! (Replies: 1)

  2. Volumes of revolution (Replies: 1)

  3. Volumes Of Revolution (Replies: 7)

  4. Determing Revolutions (Replies: 1)

Loading...