The efficiency of a wheel and axle is 100% and the ratio of their radii
PHYSICS
WAEC 2022
The efficiency of a wheel and axle is 100% and the ratio of their radii is 5:1. calculate the effort required to lift a load of mass 20kg using this machine, [g = 10 m s?2]
- A. 20N
- B. 25N
- C. 40N
- D. 100N
Correct Answer: C. 40N
Explanation
VR = 5:1 or 5
Load = 20kg or 200N
MA = \(\frac{200}{E}\)
Efficiency% = \(\frac{MA}{VR} * 100\)
100% = \(\frac{200}{5E} * 100\)
5E = 200
E = 40
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