The diagram above illustrates a block ans tackle pulley system in which an effort E supports a load of 100.0N. If the efficiency of the machine is 75%, calculate the value of E
-
A.
22.2N -
B.
38.0N -
C.
67.0N -
D.
75.0N
Correct Answer: Option A
Explanation
Given; VR = 6, e = 75%, MA = ?
e = (frac{text{MA}}{text{VR}} times frac{100}{1})
MA =(frac{75 times 6}{10})
MA = (frac{9}{2})
MA = (frac{L}{E} = frac{100}{E})
(frac{9}{2} = frac{100}{E})
9E = 100
E = (frac{200}{9})
= 22.2N