Question

a block and tackle system of pulleys having a V.R. of 5. If the efficiency of the system is 70 %,calculate i) the mechanical advantage of the system ii) the effort required to lift a load of 800 N.

Answer 1

Answer:

effeciency= 70%= 70/100=0.7

i)MA=Effeciency×V.R.=0.7×5= 3.5

ii)Effort=Load/MA=800/3.5= 228.571 N