A wheel and axle of radii 800mm and 200mm respectively is used to raise a...
PHYSICS
WAEC 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%
Correct Answer: B. 80%
Explanation
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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