a) Find the mass density of a proton, modeling it as a solid sphere of radius
b) What If ? Consider a classical model of an electron as a uniform solid sphere with the same density as the proton. Find its radius.
c) Imagine that this electron possesses spin angular momentum because of classical rotation about the z axis. Determine the speed of a point on the equator of the electron.
d) State how this speed compares with the speed of light.