In a betatron with a diameter of 1.52 m, the accelerating potential is 500 V for an electron in a stable orbit. If the electrons rotate at the rate of 5 x 105 rev/sec, what are: (a) the linear velocity of the electrons, (m/s), (b) the final energy of the electrons in MeV, and (c) linear momentum? (kgm/s) (Are electrons relativistic?)