The radius of a wheel is 30 0 cm and that of it... - WAEC Physics 2011 Question
The radius of a wheel is 30.0 cm and that of its axle is 6.0cm. Calculate the effort required to lift a load of 120.0N using this machine. Assuming 100% efficiency
A
600.0N
B
40.0N
C
24.0N
D
20.0N
correct option: c
V.R = (\frac{R}{r} = \frac{30}{6} = 5)
(\gamma = \frac{M.A}{V.R} \times \frac{100}{1} )
M.A = (\frac{100 \times 5}{100} = 5)
Effort = (\frac{L}{M.A} = \frac{120}{5})
= 24N
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