A wheel and axle have radii 80cm and 10cm respectively. If the efficiency of the...
PHYSICS
JAMB 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
Correct Answer: C. 8160N
Explanation
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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