In a screw jack, the effort required to lift the load is given by. Whe – McqOptions

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

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