An 8-pole, 3-phase, 50 Hz induction motor is running at a speed of 710 rpm with an input power of 35 kW. The stator copper-loss at this operating condition is known to be 1200 W while the rotational losses are 600 W. Find
(a) the rotor copper-loss,
(b) the gross torque developed,
(c) the gross mechanical power developed, and
(d) the net torque and mechanical power output.