A bicycle wheel makes revolutions per minute to maintain a speed of 8.91 km per hour.
Find the diameter of the wheel
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Answer:
1 revolution=1min =distance :2πr
Speed=8.91 km/hour
∴D=s×t=8.91×1000×1m
=8910m
∴ In 60min, distance=8910m
∴ In 1min, distance=
60
8910
=148.5m
∴2πr=148.5
∴r=
2×3.14
148.5
∴D=2×r=2×
2×3.14
148.5
D=47.2m.
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