The efficiency of a wheel and axle is 100% and the ratio ...
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]
20N
25N
40N
100N
Correct answer is C
VR = 5:1 or 5
Load = 20kg or 200N
MA = 200E
Efficiency% = MAVR∗100
100% = 2005E∗100
5E = 200
E = 40
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