A pulley which efficiency of 75 made up of four pulley sketch a well labelled diagram of this machine and then determine the effort required to raise two bags of the maize each weighting 100kg?

To determine the effort required to raise two bags of maize, each weighing 100kg, using a pulley system with an efficiency of 75% and made up of four pulleys, we first need to calculate the mechanical advantage of the system.

The mechanical advantage of a pulley system is calculated by counting the number of ropes supporting the load. In this case, the pulley system is made up of four pulleys, so the mechanical advantage is 4.

Efficiency = (Mechanical Advantage / Number of ropes supporting the load) x 100
75 = (4 / Number of ropes supporting the load) x 100
Number of ropes supporting the load = 4 / 0.75 = 5.33

Since we cannot have a fraction of a rope, we will round up to the nearest whole number, which means that there are 6 ropes supporting the load.

Now, we can calculate the effort required to raise two bags of maize, each weighing 100kg.

Effort = (Load / Mechanical Advantage) x Efficiency
Effort = (100kg x 2) / 4 x 0.75
Effort = 200kg / 3
Effort = 66.67kg

Therefore, the effort required to raise two bags of maize, each weighing 100kg, using a pulley system with an efficiency of 75% and made up of four pulleys is approximately 66.67kg.