A plane inclined at an angle at 30o to the hori... - WAEC Physics 1990 Question
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
correct option: c
E = M.A/V.R ; 50/100 = M.A/2
M.A = 1; L/E = 1
E = L = 120N
M.A = 1; L/E = 1
E = L = 120N
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