A boy lifts a load through a vertical height of 5 m by a fixed pulley by applying an effort at the other end. Find the velocity ratio.
In a single movable pulley system, a load of 225 kgf is lifted by an effort of 75 kgf. Velocity ratio of the single movable pulley is 4. Find the percentage efficiency of the system.
A pulley system has 5 pulleys in all and is 90% efficient. If the effort required to lift a load is 1000 N, find the resistance due to the movable parts of machine and friction.