Referring to Figure 5, the hoist machine has a mass of 850 kg and the counterweight C has a mass of 160 kg. At a given instant, the hoist machine motion upward with velocity of 2 m/s an acceleration of 1.5 m/s2. The tension in cable to draw the hoist machine by the motor can withstand a maximum tension of 4500 N. Power input to the motor is about 22 kW. Based on Figure 5, if the motor has not operated at its maximum efficiency and the efficiency of motor needs to be increased by 10%, suggest a suitable parameter that should be changed on the system. Justify your answer with calculation.

Referring to Figure 5, the hoist machine has a mass of 850 kg and the counterweight C has a mass of 160 kg. At a given instant, the hoist machine motion upward with velocity of 2 m/s an acceleration of 1.5 m/s2. The tension in cable to draw the hoist machine by the motor can withstand a maximum tension of 4500 N. Power input to the motor is about 22 kW. Based on Figure 5, if the motor has not operated at its maximum efficiency and the efficiency of motor needs to be increased by 10%, suggest a suitable parameter that should be changed on the system. Justify your answer with calculation.