1108Civil EngineeringMedium
The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to________?
AW (sin a + cos )
BWcos(a + )
CWsin(a + )
DWtan(a + )
Correct answer
D. Wtan(a + )
Explanation
The correct answer is Wtan(a + ).