In the two-stage planetary gear train shown in Figure Q1, gear 6 is fixed and crank arms C and D are attached to the output shaft. Gears 3 and 4 form a compound wheel that rotates freely about the output shaft. The numbers of teeth in the gear wheels are as follows: N1 = 20, N3 = 72, N4 = 24, and N6 = 64. Gear A rotates at 300 r/min clockwise. Determine:
1.1 The speed and direction of rotation of the output shaft (10)
1.2 The torque required to hold gear 6 when the gear is transmitting 12 kilowatts with negligible friction losses. (4) [14]