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

1.	In a screw jack, the effort required to lower the load W is given by
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» D. P = W cos(≈í¬± + ≈ì√ú)

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

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