In a screw jack of lead angle α, the effort required to lift the load W is given by ___________ (ϕ = Friction Angle)

In a screw jack of lead angle α, the effort required to lift the load

1.	In a screw jack of lead angle α, the effort required to lift the load W is given by ___________ (ϕ = Friction Angle)
A.	P = W tan (α - ϕ)
B.	P = W tan (α + ϕ)
C.	P = W cos (α - ϕ)
D.	P = W cos (α + ϕ)
Answer» C. P = W cos (α - ϕ)

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In a screw jack of lead angle α, the effort required to lift the load W is given by ___________ (ϕ = Friction Angle)

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