Physics WAEC

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.

A. 22.2N
B. 38.0N
C. 67.0N
D. 75.0N

Correct Answer: Option A

A. 22.2N

SEE ALSO The diagram represents a block-and-tackle pulley system on which an effort of 50N is just able to lift a load of weight W. If the efficiency of the machine is 40%. find the value of W
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