The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to _________________?
(A) Wtan(a + )
(B) Wtan(a-)
(C) Wcos(a + )
(D) Wsin(a + )
(E) W (sin a + cos ).
The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to _________________?
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