An electric elevator with a motor at the top has a multistrand cable weighing 3 lb/ft. When the car is at the first floor, 110 ft of cable are paid out, and effectively 0 ft are out when the car is at the top floor. How much work does the motor dojust lifting the cable when it takes the car from the first floor to the top?The amount of work required isft-lb.(Simplify your answer.)

Solution:- Mass of cable =3×110=330 lb Length =110 ft Center of mass is at 110/2=55 ft

Answered: An electric elevator with a motor at…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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