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 block and tackle pulley arrangement has 6 pulleys…A block and tackle pulley arrangement has 6 pulleys…A wheel and an axle is used to raise a load whose…What effort will a machine of efficiency 90% apply…The diagram represents a block-and-tackle pulley…