問題詳情
2. An elevator A of total mass 800 kg and a counterweight B of mass 300 kg are shown inFigure 2. The elevator is driven by an electric motor. Determine the efficiency of themotor in the following cases. Assume that the pulleys are massless and neglect axlefriction.
【題組】(1) The elevator is moving upwards with a constant velocity of 2.0 m/s. The powerdelivered to the motor is 15.2 kW. (10%)
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