The worker lifts a load weighing 300 N using a block system to a height of 1.5 m, performing a work of 500 J. What is the efficiency of the blocks?
The efficiency of the blocks is equal to the ratio of useful work to spent. In this case, the useful work will be lifting to a certain height. Therefore, Ap = m * g * h = P * h = 450J.
Efficiency = 450/500 = 0.9
Also, as a percentage, the efficiency is 90%
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