A loaded ore car has a mass of 935 kg and rolls on rails with negligible friction. It starts from rest and is pulled up a mine shaft by a cable connected to a winch. The shaft is inclined at 28.5° above the horizontal. The car accelerates uniformly to a speed of 2.20 m/s in 10.5 s and then continues at constant speed.
(a) What power must the winch motor provide when the car is moving at constant speed?
W
(b) What maximum power must the winch motor provide?
W
(c) What total energy transfers out of the motor by work by the time the car moves off the end of the track, which is of length 1250 m?
J