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Question

In a screw jack, the effort required to lift the load is given by(where W = Load lifted, `alpha` = Helix angle, and `phi`= Angle of friction.)


Options:
A .  `P = W tan (alpha - phi )`
B .  `P = W tan (alpha +phi )`
C .  `P = W tan (phi - alpha)`
D .  `P = W cos (alpha +phi )`
Answer: Option B



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