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

WAEC 1991

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

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

Correct Answer: Option D

Explanation

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