A block and tackle pulley arrangement has 6 pulleys in which an effort of 50N supports a load of 200N; calculate the efficiency of the machine by Sunday | Nov 4 | Physics JAMB | 0 comments A. 80.0% B. 76.6% C. 66.7% D. 60.7% Correct Answer: Option C – 66.7% Users Also Read These:A pulley system has three pulleys in the fixed block…What effort will a machine of efficiency 90% apply…A block and tackle pulley arrangement has 6 pulleys…A machine of velocity ratio 5 is used in lifting a…What effort will a machine of efficiency 90% apply…