The diagram above illustrates a block and tackle pulley system in which an effort E supports a load of 100.0N. If the efficiency of the machine is 75%, calculate the value of E. By: Sunday|Published on: Jan 25|Categories: Physics WAEC| 0 comments A. 22.2N B. 38.0N C. 67.0N D. 75.0N Correct Answer: Option A A. 22.2N Users Also Read These:A block and tackle pulley arrangement has 6 pulleys…A machine of velocity ratio 6 requires an effort of…A machine of efficiency 80% is used to lift a box.…A load of mass 120kg is raised vertically through a…What effort will a machine of efficiency 90% apply…SEE ALSO A uniform metre rule is balanced on a fulcrum placed at the 35cm mark by suspending a mass of 120g at the 10cm mark. Calculate the mass of the metre rule.