A plane inclined at an angle at 30o to the horizontal has an efficiency of 50%. The force parallel to the plane required to push a load of 120 N uniformly up the plane is
-
A.
40√3N -
B.
60N -
C.
120N -
D.
200N -
E.
240N
Correct Answer: Option C
Explanation
E = M.A/V.R ; 50/100 = M.A/2
M.A = 1; L/E = 1
E = L = 120N