What effort will a machine of efficiency 90% apply to a load of 180N if its efforts arm is twice as long as its load arm? by Sunday | Nov 1 | Physics JAMB | 0 comments A. 100N B. 90N C. 80N D. 120N Correct Answer: Option A – 100N Users Also Read These:A wheel and axle is used to raise a load of 500N by…The fiqure above represents a block-and-tackle…A machine of efficiency 80% is used to lift a box.…A load of mass 120kg is raised vertically through a…The diagram shown represents a block-and-tackle…