A permanent-magnet dc motor is known to have an armature resistance of 1.03 Ω. When operated at no load from a dc source of 50 V, it is observed to operate at a speed of 2100 r/min and to draw a current of 1.25 A. The power output of the motor when it is operating at 1700 r/min from a 48 V source is ______ (in W)