Apulley system lifts a 500-lb. block 2.0 feet with an effort of only 50 lb. if the 50 lb. moves 30 feet, calculate the efficiency of the pulley system.

Efficiency of the pulley system is 66.7 %

Explanation:

It is given that,

Input force,

Distance, d₁ = 2 feet

Output force,    

Distance, d₂ = 30 feet

The efficiency of pulley system is defined as ratio of output work done to the input work done i.e.

Hence, the efficiency of the pulley system is 66.7 %    

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