A block and tackle system has six pulleys. a force of 50N applied to it...
PHYSICS
WAEC 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
Correct Answer: D. 120N
Explanation
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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