Physics (2017) Discuss

A block and tackle pulley arrangement has 6 pulleys in which an effort...

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Question 11
A
80.00%
B
76.60%
C
66.70%
D
60.70%
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 = \(\frac{4}{6}\) \(\times\) 100 = 66.67%

Correct option: C

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