The handle of a screw jack is 35 cm long and pitch of the screw is 0.5 cm. What force must be applied at the end of the handle to lift a load of 2000N, if the efficiency of the jack is 30% [π = 22/7]? by Sunday | Mar 24 | Physics WAEC | 0 comments A. 152.0N B. 132.0N C. 15.2N D. 440.0N Correct Answer: Option C = 15.2N Users Also Read These:The diagram represents a block-and-tackle pulley…The velocity ratio and efficiency of a system of…A machine whose efficiency is 60% has a velocity…A spring balance, which is suspended from the roof…A screw jack with a Tommy bar of length 12cm is used…