In the Bohr model of the hydrogen atom, a single electron revolves around a single proton in a circle of radius R
a) By applying Newton's second law and the coulomb force, derive an expression for the electron's speed in terms of its mass, its charge e, its radius R and any constants.
b) Find the total energy of the particle in joules for R= 0.528 A°
(A°= 10^-10 m)