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d=60cm=0,6m
f=900/60s=15/s
T=1/f=0,0(6)
Szukane:
V=?
V=l*f
l=2(znaczek pi)r
l=2*3,14*0.6/2
l=1,884m
V=1,884m*15/s
V=28,26m/s
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Dane:
d=28cali=0,7112m
V=16km/h=4,(4)m/s
Szukane:
f=?
l=2(znaczek pi)d/2
l=2*3,14*0,7112/2
l=~2.23m
f-ilość obrotów na sekundę
f=V/l
f=4,4/2.23
f=~1.97/s