Question on: WAEC Physics - 2006
A block and tackle system has six pulleys. a force of 50N applied to it lifts a load of weight W. If the efficiency of the system is 40%, calculate W
A
300N
B
200N
C
140N
D
120N
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Correct Option: D
M.A = (\frac{E \times V.R}{100} = \frac{40 \times 6}{100} = \frac{12}{5})
W = M.A x effort
= (\frac{12}{5} \times 50 = 120N)
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