A wheel and axle of radii 800mm and 200mm respectively is used to raise a body of weight 800N by the application of 250N. Calculate the efficiency of the machine by Sunday | May 20 | Physics WAEC | 0 comments A. 85% B. 80% C. 60% D. 20% Correct Answer: Option B B. 80% Users Also Read These:A load of mass 120kg is raised vertically through a…A machine of efficiency 80% is used to lift a box.…The mass and weight of a body on earth are 8kg and…A machine has an efficiency of 60%. If the machine…A machine of efficiency 8% is used to raise a body…