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 machine has a velocity ratio of 4; if it requires…A wheel and axle is used to raise a load of 500N by…If a wheel 1.2 m in diameter rotates at one…The mass and weight of a body on earth are 8kg and…A machine is used to lift a load of 20 N through a…