_ In a screw jack, the effort required to lift the load W is given by (where ≈í¬± = Helix angle, and ≈ì√ú = Angle of friction)$?

P = W tan(≈ì√ú - ≈í¬±)

P = W tan(≈í¬± - ≈ì√ú)

P = W tan(≈í¬± + ≈ì√ú)

P = W cos(≈í¬± + ≈ì√ú)

_ In a screw jack, the effort required to lift the load W is given by

1.	_ In a screw jack, the effort required to lift the load W is given by (where ≈í¬± = Helix angle, and ≈ì√ú = Angle of friction)$?
A.	P = W tan(≈í¬± - ≈ì√ú)
B.	P = W tan(≈í¬± + ≈ì√ú)
C.	P = W tan(≈ì√ú - ≈í¬±)
D.	P = W cos(≈í¬± + ≈ì√ú)
Answer» C. P = W tan(≈ì√ú - ≈í¬±)

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_ In a screw jack, the effort required to lift the load W is given by (where ≈í¬± = Helix angle, and ≈ì√ú = Angle of friction)$?

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