A block and tackle system has 5 pulleys. If an effort of 1000 N is needed in the downward direction to raise a load of 4500 N, calculate :
(a) the mechanical advantage ,
(b) the velocity ratio, and
(c) the efficiency of the system.
a)Mechanical advantage (MA)= = 4.5
b)Velocity ratio (VR) = Number of pulley= 5
c)Efficiency = × 100 = × 100 = 90 %