Question

A block and tackle system consisting of 5pulleys are used to raise a load of 400N through a height of 10m, if the work done against friction is 100joules.
1.calculate the work done by effort.
2.Calculate the efficiency of the system.
work output = 400 Newtons * 10 meters = 4,000 Joules
work input = 4,000 + 100 = 4,100 Joules
efficiency = 100 (4000/4100) = 97.6%

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