5.16 An elevator cable suspends an el-evator car and passengers with a totalmass of 550 kg in the Omnicorp regionalheadquarters.If the car is being raised at a constantspeed of 1.2 ms-l then:(a) At what rate is work being done bythe cable on the car?The efficiency of the motor at convertingelectrical power to mechanical power isjust 15%(b) How much electrical power is beingused to raise the car?Budgets are being slashed at Omnicorpand the amount of power used by eleva-tors has to be reduced by 10%.(c)At what speed are the elevatorsraised under the new regime?An engineer discovers a way to use theelevator motor to actually generate elec-tricity when lowering the elevator car. Ifthe efficiency of this process is just 5%then:(d) How much electricity is generatedwhen lowering the car 55 m fromthe top floor to the ground floor?How much electrical energy is used(e)up when raising the elevator fromthe ground floor to the top floor?

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