Question

A pulley system has 4 pulleys and is used to raise a load of 500N through a height of 20cm. If the total workdone against friction is 800J, calculate; (i) the total work done by the effort (ii)the efficiency of the system (iii)Effort applied

Answer 1

Number of pulleys = 5Load = 50 kgf= 50x10=500 N (g=10 m/s2)work=load x hieght = 500 x20 = 10000 J Energy lost to overcome friction = input work - output work 2000= input work - 10000 input work= 12000 J

i think