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

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1.	The effort required to lift a load W on a screw jack with helix angle a and angle of friction<="" div="">
A.	Wtan(a + <)>)
B.	Wtan(a-<)>)
C.	Wcos(a + )
D.	Wsin(a + <(>)
Answer» B. Wtan(a-<)>)

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