Recent content by mewon

  1. M

    Gauss Sphere Surface / U = -W / f=ma=qE

    This is a great site. I'm paying my dues which are a great value and I'm sure I'll be here more through the next quarter Physics curriculum as well. I am teaching post MA and have trouble getting to my Physics teacher office hours nor any school offered tutoring. It's also a way better...
  2. M

    Gauss Sphere Surface / U = -W / f=ma=qE

    Thank you Doc Al! Had to take a break but I got it now ;-) It was easier than I was making it. U = W 1/2(MV^2) = (1/4pieEo)(Qe/r)
  3. M

    Gauss Sphere Surface / U = -W / f=ma=qE

    Thank you for the link; that is clear and helpful (and unlike anything in my book's chapter). I was trying to say similarly I think, applying Gauss/Coulomb ideas with: Uf - Ui = -W I'll try writing the math now! Question though, why does the problem statement say that there is no "kinetic"...
  4. M

    Gauss Sphere Surface / U = -W / f=ma=qE

    Ui = 0 at infinity and electric potential V is also zero at infinity. Uf/q = electric potential energy on the surface of the sphere.
  5. M

    Gauss Sphere Surface / U = -W / f=ma=qE

    Homework Statement What is the escape speed for an electron initially at rest on the surface of a sphere with a radius of 1.0 cm and a uniformly distrubted charge of 1.6 X 10^-15 C? That is, what initial speed must the electron have in order to reach an infinite distance from the sphere and...