%_Efficiency of a screw jack is given by_%

1.	%_Efficiency of a screw jack is given by_%
A.	tan (≈í¬± + ≈ì√ú)/tan≈í¬±
B.	tan≈í¬±/tan (≈í¬± +≈ì√ú)
C.	tan (≈í¬± - ≈ì√ú)/tan≈í¬±
D.	tan≈í¬±/tan (≈í¬± - ≈ì√ú)
Answer» C. tan (≈í¬± - ≈ì√ú)/tan≈í¬±

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%_Efficiency of a screw jack is given by_%

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