A lift (elevator) in a tall building is operated by an electric motor as shown inFigure QB3. The lift car is suspended from a cable that is wrapped around thesheave. The other end of the cable supports a counter-weight.The sheave has a diameter of 550 mm. The counter-weight has a mass of 1750kg and the combined mass of the lift car and passengers is 2000 kg. Theefficiency of the motor is 90%. Air resistance and friction between the cable andthe sheave should be ignored. When the lift car is being raised at a constantspeed of 2.50 m/s, determinei.) The angular velocity of the sheave[25%]ii.) The power output of the motor[25%]iii.) The power input to the motor[25%]iv.) The torque generated by the motor[25%]

A lift (elevator) in a tall building is operated by an electric motor as shown inFigure QB3. The lift car is suspended from a cable that is wrapped around thesheave. The other end of the cable supports a counter-weight.The sheave has a diameter of 550 mm. The counter-weight has a mass of 1750kg and the combined mass of the lift car and passengers is 2000 kg. Theefficiency of the motor is 90%. Air resistance and friction between the cable andthe sheave should be ignored. When the lift car is being raised at a constantspeed of 2.50 m/s, determinei.) The angular velocity of the sheave[25%]ii.) The power output of the motor[25%]iii.) The power input to the motor[25%]iv.) The torque generated by the motor[25%]

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter4: Coplanar Equilibrium Analysis

Section: Chapter Questions

Problem 4.31P: The homogeneous plate of weight W is suspended from two cables. Determine the force P that is...

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A lift (elevator) in a tall building is operated by an electric motor as shown inFigure QB3. The lift car is suspended from a cable that is wrapped around thesheave. The other end of the cable supports a counter-weight.The sheave has a diameter of 550 mm. The counter-weight has a mass of 1750kg and the combined mass of the lift car and passengers is 2000 kg. Theefficiency of the motor is 90%. Air resistance and friction between the cable andthe sheave should be ignored. When the lift car is being raised at a constantspeed of 2.50 m/s, determine the torque generated by the motor answer: 750Nm
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