4) In the pulley and timber system shown above if the person apply a vertical downward force slowly, can he pull himself up before the sliding of the timber on the ground? Support your answer with calculations, assuming the weight of the person W,= 700 N, the weight of the timber W-400 N, the coefficient of friction between the timber and the ground p=0.4 and 8-60 degrees. Obtain the final values of reactions at the fixed support of the pulley at the ceiling, assuming the radius of the pulley r=10 cm, and the distance d=22 cm.

4) In the pulley and timber system shown above if the person apply a vertical downward force slowly, can he pull himself up before the sliding of the timber on the ground? Support your answer with calculations, assuming the weight of the person W,= 700 N, the weight of the timber W-400 N, the coefficient of friction between the timber and the ground p=0.4 and 8-60 degrees. Obtain the final values of reactions at the fixed support of the pulley at the ceiling, assuming the radius of the pulley r=10 cm, and the distance d=22 cm.

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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