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 diagram above illustrates a block and tackle…A machine has an efficiency of 60%. If the machine…A machine of velocity ratio 5 is used in lifting a…A machine of velocity ratio 6 requires an effort of…