The effort required to lift a load W on a screw jack with helix angle – McqOptions

MCQOPTIONS

1.	The effort required to lift a load W on a screw jack with helix angle a and angle of friction
A.	tan(a + <)>)
B.	tan(a-<)>)
C.	cos(a + )
D.	sin(a + <(>)
Answer» B. tan(a-<)>)

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