2-131 The elevator of a large building is to raise a net mass of 400 kg at a constant speed of 1 - Themodynamics Cengel & Boles 5th edition

2-131 The elevator of a large building is to raise a net mass of 400 kg at a constant speed of 12 m/s using an electric motor. Minimum power rating of the motor should be a) 0 kW b) 4.8 kW c) 47 kW d) 12 kW e) 36 kW


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