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A 4 Pulley system is used to lift a mass of 10 kg If a 40 Newton force is applied by the man to lift this Mass through 1 M a.calculate the velocity ratio of system b. the  energy transferred by the man to the pulley system in raising the load through 1 m c. The potential energy transferred to the load d.efficiency of pulley system
Asked by Samrat | 30 Jun, 2018, 09:01: PM
answered-by-expert Expert Answer
(a) Velocity ratio = number of pulleys = 4
 
(b) energy transfered by man = Force×distance = 40×4 = 160 J ( To raise the load by 1 m, effort has to move 4 m because veleocity ratio = 4)
 
(c) Potential energy transfered to load = load weight×distance = 10×9.8×1 = 98 J
 
(d) efficiency = 98/160 = .6125 = 61.25%
Answered by Thiyagarajan K | 06 Jul, 2018, 03:54: PM

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