Physics 2007 Jamb Examination
Physics 2007 Jamb Examination
Question 51
A machine has a velocity ratio of 4. If it requires 800 N to overcome a load of 1600 N, what is the efficiency of the machine?
Mechanical advantage = Load / Effort = 1600 / 800 = 2. Efficiency = (MA / VR) × 100 = (2 / 4) × 100 = 50%.
Not clear enough?
Question 52
A plane inclined at an angle of 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
Velocity ratio = 1 / sin30° = 2. Effort = Load / (Efficiency × VR) = 120 / (0.5 × 2) = 120 N.
Not clear enough?
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