A wheel and axle have radii 80cm and 10cm respectively. If the efficiency of the machine is 0.85, an applied force of 1200N to the wheel will raise a load of
-
A.
8.0N -
B.
6.8N -
C.
8160N -
D.
9600N
Correct Answer: Option C
Explanation
Efficiency = m.A x (frac{1}{V.R}) x 100%
85 = (frac{load}{1200}) x (frac{10}{80}) x (frac{100}{1})
load = 8160N