Question on: JAMB Physics - 1991
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
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Correct Option: C
Efficiency = m.A x (\frac{1}{V.R}) x 100%
85 = (\frac{load}{1200}) x (\frac{10}{80}) x (\frac{100}{1})
load = 8160N
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