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A wheel and axle have radii 80cm and 10cm respe... - JAMB Physics 1991 Question

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 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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