WAEC - Physics (2006 - No. 19)
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
300N
200N
140N
120N
Explicació
M.A = \(\frac{E \times V.R}{100} = \frac{40 \times 6}{100} = \frac{12}{5}\)
W = M.A x effort
= \(\frac{12}{5} \times 50 = 120N\)
W = M.A x effort
= \(\frac{12}{5} \times 50 = 120N\)