873Mechanical 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________?
AWcos(a + )
BWsin(a + )
CW (sin a + cos ).
DWtan(a + )
Correct answer
D. Wtan(a + )
Explanation
The correct answer is Wtan(a + ).