The diagram shown represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40, then the value of W is? By: Sunday|Published on: Oct 30|Categories: Physics JAMB| 0 comments A. 28.0 B. 48.0N C. 233.0N D. 50.0N Correct Answer: Option D – 50.0N Users Also Read These:What effort will a machine of efficiency 90% apply…The fiqure above represents a block-and-tackle…What effort will a machine of efficiency 90% apply…A machine of velocity ratio 6 requires an effort of…A block and tackle system has six pulleys. a force…SEE ALSO A 2000W electric heater is used to heat a metal object of mass 5kg initially at 10°C. If a temperature rise of 30°C is obtained after 10min; the heat capacity of the material is?