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:In an ideal wheel an axle system; R stand for the…A load of mass 120kg is raised vertically through a…A transformer has 400 turns and 200 turns in the…A machine of velocity ratio 6 requires an effort of…A simple machine with an efficiency of 75% lifts a…