WAEC - Physics (1990 - No. 5)
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
40√3N
60N
120N
200N
240N
Vysvětlení
E = \(\frac{\text{M.A}}{\text{V.R}}\) ; \(\frac{50}{100}\) = \(\frac{\text{M.A}}{2}\)
M.A = 1; \(\frac{\text{L}}{\text{E}}\) = 1
E = L = 120N
M.A = 1; \(\frac{\text{L}}{\text{E}}\) = 1
E = L = 120N