JAMB - Physics (2017 - No. 11)
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
80.0%
76.6%
66.7%
60.7%
Explanation
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%
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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