Bicycle wheel

A bicycle wheel has a diameter of 60 cm. Approximately how many times does wheel rotate at 2.5 km long trip?

Result

N =  1326

Solution:

d=60 cm=60/100 m=0.6 m o=π d=3.1416 0.61.885 m s=2.5 km=2.5 1000 m=2500 m  N=s/o=2500/1.8851326.29121326d=60 \ cm=60 / 100 \ m=0.6 \ m \ \\ o=\pi \cdot \ d=3.1416 \cdot \ 0.6 \doteq 1.885 \ \text{m} \ \\ s=2.5 \ km=2.5 \cdot \ 1000 \ m=2500 \ m \ \\ \ \\ N=s/o=2500/1.885 \doteq 1326.2912 \doteq 1326



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