Question on: WAEC Physics - 2005
A wheel and axle of radii 800mm and 200mm respectively is used to raise a body of weight 800N by the application of 250N. Calculate the efficiency of the machine
A
85%
B
80%
C
60%
D
20%
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Correct Option: B
V.R = (\frac{R}{r} = \frac{800}{200} = 4)
M.A = (\frac{L}{E} = \frac{800}{250} = 3.2)
y = (\frac{M.A}{v.R} \times \frac{100}{1} = 80)%
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