$(10)$ A two$-$pole, symmetrical induction motor is supplied by balanced, $60-$Hz stator currents that produce a ccw rotating mmfs$.$ The rotor is rotating ccw at $0\mathrm{.}93$e$.$ a$.$ Determine the frequency of the rotor currents. $(4\mathrm{.}20$ Hz$)$ b$.$ Determine the angular velocity of mmfs and mmfr relative to an observer on the stator. $(377$ rad$/$s$)$ c$.$ Determine the angular velocity of mmfs and mmfr relative to an observer on the rotor. $(26\mathrm{.}39$ rad$/$s$)$