in a three pulley system a load of 900N is lifted by an effort of 600N. Calculate MA VR and efficiency of the pulley system
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machenical advantage = load/effort
= 600N/200N = 3
velocity ratio = number of pulleys = machenical advantage = 3
actual machenical advantage = MA - (resistance/load) = 3 - 400/200 = 3 - 2 = 1
so efficiency = actual MA/VR × 100
= 1/3 × 100
= 33 1/3 %
Explanation:
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