Question on: JAMB Physics - 2017
A block and tackle pulley arrangement has 6 pulleys in which an effort of 50N supports a load of 200N, calculate the efficiency of the machine
A
80.0%
B
76.6%
C
66.7%
D
60.7%
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Correct Option: C
Efficiency = (\frac{ma}{V.R}) x (\frac{100}{1})
V.R = number of pulleys = 6
ma = (\frac{\text{Load}}{\text{Effort}}) = (\frac{200}{50}) = 4
Effiecieny = (\frac{4}{6}) × 100 = 66.67%
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