Question: A motor on an escalator is capable of developing 12 kW of power. (a) How many passengers of mass 75 kg each can it lift

A motor on an escalator is capable of developing 12 kW of power.
(a) How many passengers of mass 75 kg each can it lift a vertical distance of 9.0 m per min, assuming no power loss?
(b) What power, in kW, motor is needed to move the same number of passengers at the same rate if 45% of the actual power developed by the motor is lost to friction and heat loss?

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