The diagram represents a block-and-tackle pulley system on which an effort of 50N is just…

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
  • A.
    300N
  • B.
    200N
  • C.
    140N
  • D.
    120N
  • E.
    20N
Correct Answer: Option D
Explanation

Eff = (frac{MA}{VR}) x 100%
40 = (frac{MA}{60})
MA = 240
(frac{L}{E} = frac{240}{100})
W = L = (frac{240}{100}) x 50
= 120N

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