FpullӨA person, weighing 155 lb, is being lifted by a rope thrown.over a tree branch as shown (drawing not to scale). If thestatic coefficient of friction between the rope and the treebranch is us = 0.67, and the 0 = 45°. Determine the pullingforce required to start lifting the person and the pulling forcerequired to keep the person from falling?Pulling force to lift the person:Pulling force to keep the person from falling:lblb

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Answered: Fpull Ө A person, weighing 155 lb, is…

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

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.72P

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Fpull Ꮎ A person, weighing 115 lb, is being lifted by a rope thrown over a tree branch as shown (drawing not to scale). If the static coefficient of friction between the rope and the tree branch is μs = 0.60, and the 0 = 45°. Determine the pulling force required to start lifting the person and the pulling force required to keep the person from falling? Pulling force to lift the person: Pulling force to keep the person from falling: lb lb
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QUESTION 1 The centre of gravity for the ladder (mass = 10 kg) acts at point G as shown in the figure. Given the B 0.4 m coefficient of statics friction between the floor and the ladder is HA = 0.3 and between the wall and the ladder is Hg = 0.2. Find the mass of the ball, m if the ladder set-up is just about to slide. 0.8 m G SOALAN 1 Pusat graviti bagi tangga (mass = 10 kg) bertindak pada titik G seperti yang ditunjukkan di dalam m gambarajah. Diberi angkali geseran statik di antara lantai dan tangga adalah Ha = 0.3 dan di antara 70° A dinding dan tangga adalah ug = 0.2. Cari jisim bagi D bola, m sekiranya tangga dalam keadaan untuk mula menggelongsor.
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Consider a 14.5 kg rectangular block of length 0.40 m attached to a spring with a spring constant of 30.5 N/m. The coefficient of static friction between this block and the surface is 0.310.

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