Question

Calculate the efficiency a pulley if an effort of 1000N is required to raise a a load of 4500N with a velocity ratio of 6

Answer 1

selected Sep 11, 2018 by faiz

 

A block and tackle system has 5 pulleys. (n = 5)

Effort = 1000 N

Load = 4500 N

(a) The mechanical advantage M.A = load/effort = 4500/1000 = 4.5

(b) The velocity ratio = n = 5

(c) The efficiency of the system η = M.A/V.R = 4.5/5 = 0.9 or 90%