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|Published on: Nov 1|Categories: Physics JAMB| 0 comments A. 100N B. 90N C. 80N D. 120N Correct Answer: Option A – 100N Users Also Read These:A wheel and an axle is used to raise a load whose…A block and tackle pulley arrangement has 6 pulleys…The diagram represents a block-and-tackle pulley…A machine of velocity ratio 5 is used in lifting a…The fiqure above represents a block-and-tackle…SEE ALSO In a series R-L-C circuit, R = 10Ω, Xc= 4Ω and XL = 9Ω. The impedance of the circuit is?