The nucleus of a 125^Xe atom (an isotope of the element xenon with mass 125 u) is 6.0 fm in diameter. It has 54 protons and charge q=+54e Hint: Treat the spherical nucleus as a point charge.
A: What is the electric force on a proton 7.0fm from the surface of the nucleus?
B: What is the proton's acceleration?