A 10-kW, 230-V shunt generator, with an armature-circuit resistance of 0.1 Ω and a field circuit resistance of 230 Ω, delivers full load at rated voltage and 1000 r/min. If the machine is run as a motor while absorbing 10 kW from 230- V mains, find the speed of the motor. Neglect the brush-contact drop.