A machine of efficiency 80% is used to lift a box. If the effort applied by the machine is twice the weight of the box. Calculate the velocity ratio of the machine
-
A.
0.50 -
B.
0.63 -
C.
0.80 -
D.
1.60
Correct Answer: Option B
Explanation
Y = (frac{M.A}{V.R} times frac{100}{1})
= (frac{frac{1}{2}}{V.R} times frac{100}{1})
V.R = 0.625