A person weighing 600 N platform attached to the lower block of a system of 5 pulleys arranged in the second system. The platform and the lower block weigh 100N. The man himself supports by exerting a downward pull at the free end of the rope. Neglecting friction, the minimum pull of the man will be

A person weighing 600 N platform attached to the lower block of a system of 5 pulleys arranged in the second system. The platform and the lower block weigh 100N. The man himself supports by exerting a downward pull at the free end of the rope. Neglecting friction, the minimum pull of the man will be Correct Answer 116.7 N

n = total number of pulleys in the system = 5 W = 600 N Weight of the lower block and platform = 100 N Total weight = 600 + 100 = 700 N Let the pull exerted by the man be P newton. Due to this pull the effective load on the lower platform will reduce to (700 – P) nP = effective load = 700 – P therefore, 5P = 700 -P 5P = 700 P = 116.7 N.
Machine Kinematics Pulleys
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