A plane inclined at an angle at 30° to the horizontal has an efficiency of...
PHYSICS
WAEC 1990
A plane inclined at an angle at 30° 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. 40N
- B. 60N
- C. 120N
- D. 200N
Correct Answer: C. 120N
Explanation
E = M.A/V.R ; 50/100 = M.A/2 M.A = 1; L/E = 1 E = L = 120N
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