A block and tackle system has 6 pulleys. If the efficiency of the machine is 60%, determine its mechanical advantages
-
A.
12.0 -
B.
10.0 -
C.
3.6 -
D.
1.8
Correct Answer: Option C
Explanation
M.A = (frac{Z times V.R}{100} = frac{60 times 5}{100} = 3.6)