Problem 4.85 IConsider a simple elevator design in which a 15,000 kg car A is con-nected to a 12,000 kg counterweight B. Suppose that a failure of thedrive system occurs (the failure does not affect the rope connecting Aand B) when the car is at rest and 50 m above its buffer, causing theelevator car to fall. Model the car and the counterweight as particlescar Acounterweight Band the cord as massless and inextensible, and model the action ofthe emergency brakes using a Coulomb friction model with kineticfriction coefficient µk = 0.5 and a normal force equal to 35% of thecar's weight. Determine the speed with which the car impacts thebuffer.carcounterweightbufferbuffer

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|Consider a simple elevator design in which a 15,000 kg car A is con- nected to a 12,000kg counterweight B. Suppose that a failure of the drive system occurs (the failure does not affect the rope connecting A and B) when the car is at rest and 50 m above its buffer, causing the elevator car to fall. Model the car and the counterweight as particles and the cord as massless and inextensible, and model the action of car the emergency brakes using a Coulomb friction model with kinetic friction coefficient µk = 0.5 and a normal force equal to 35% of the car's weight. Determine the speed with which the car impacts the buffer. ca buft

|Consider a simple elevator design in which a 15,000 kg car A is con- nected to a 12,000kg counterweight B. Suppose that a failure of the drive system occurs (the failure does not affect the rope connecting A and B) when the car is at rest and 50 m above its buffer, causing the elevator car to fall. Model the car and the counterweight as particles and the cord as massless and inextensible, and model the action of car the emergency brakes using a Coulomb friction model with kinetic friction coefficient µk = 0.5 and a normal force equal to 35% of the car's weight. Determine the speed with which the car impacts the buffer. ca buft

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

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter6: Beams And Cables

Section: Chapter Questions

Problem 6.66P: A uniform 80-ft pipe that weighs 960 lb is supported entirely by a cable AB of negligible weight....

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