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2πr=80πcm=0,8πm≈2,5m
108km/h=30m/s
30/2,5=12 obrotow
Obw. = 2 pi r
Obw = 2 * 3.14 * 40 = 251.2 cm
1h=60min=3600sekund
108km = 10800000cm
3600 s - 10800000 cm
1s - x
x = 10800000/3600 = 3000 cm
251.2 cm - 1 obrót
3000 cm - y
y=3000/251.2 = ok. 11.94 obrotu na sekunde