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 machine has an efficiency of 60%. If the machine…The diagram shown represents a block-and-tackle…A machine of velocity ratio 5 is used in lifting a…What effort will a machine of efficiency 90% apply…A block and tackle pulley arrangement has 6 pulleys…