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