Question on: WAEC Physics - 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
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Correct Option: D
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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