A wheel and an axle is used to raise a load whose weight is 800N when an effort of 250N is applied. If the radii of the wheel and axle are 800mm and 200mm respectively, the efficiency of the machine is by Sunday | Nov 7 | Physics JAMB | 0 comments A. 90% B. 80% C. 85% D. 87% Correct Answer: Option B – 80% Users Also Read These:A machine has a velocity ratio of 4; if it requires…A machine of velocity ratio 5 is used in lifting a…What effort will a machine of efficiency 90% apply…In an ideal wheel an axle system; R stand for the…A machine of velocity ratio 6 requires an effort of…