Question

What is the mechanical performance of a pulley if the person using it has to pull 4.0 m of rope to lift a 250 N bucket of water a distance of 2.0 m? The person pulls with a force of 150 N. A hoist consists of a rope and several pulleys. This device multiplies a light force. If the weight of a motor reaches 2500 N and it takes 4.0 m of rope and a force of 700 N to lift it 1 m, what is the mechanical efficiency of the hoist? Name three ways to increase efficiency mechanics of your bike.