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A load of 400N is lifted by first class lever in which the load is situated 20m away from fulcrum and effort is situated 60m from fulcrum ,if 150N effort is applied on the lever then calculate the Mechanical Advantage and Velocity Ratio.


In a well, Water is filled up to height of 6meter, then what is the pressure exerted by liquid at the bottom of well


The Efficiency of a machine is never 100% , Why ?