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l = 2*pi*r
l = 2*3,14*0.3m =1,884m
72km/h = 72000m/3600s = 20m/s
Prędkość w ruchu obrotowym:
v = 2pi*r/T
T = 2pi*r/v
T = 1,884m/20m/s = 0,0942s
f =1/T
f = 1/0,0942s = 10,61/s
1/s = Hz
f = 10,61Hz