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1. In a screw jack, the effort required to lift the load is given by(where W = Load lifted, α = Helix angle, and φ = Angle of friction.)
(A): P = W tan (α - φ)
(B): P = W tan (α + φ)
(C): P = W tan (φ - α)
(D): P = W cos (α + φ)
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