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

The correct answer is C. 120N

E = M.A/V.R ; 50/100 = M.A/2

M.A = 1; L/E = 1

E = L = 120N

Previous question Next question