Question

diagram of a pulley system of velocity ratio 4 if the efficiency is 90percent find the mechanical advantage
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Answer 1

We have to find mechanical advantage of a pulley system, velocity ratio of which is 4 and efficiency is 90 %.

Solution : mechanical advantage is the ratio of force produced by a machine to the force applied on it. In short, it is the ratio of output force to input force.

For pulley system, mechanical advantage is given by, MA = velocity ratio × efficiency

Here velocity ratio = 4 and efficiency = 90% = 90/100 = 0.9

so, the mechanical advantage = 4 × 0.9 = 3.6

Therefore the mechanical advantage of pulley system is 3.6