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V = 50 cm/s
f = ?
V = 2pir/T
T= 1/f
V = 2pirf
f = V/2pir
f = 50 cm/s / 2*3,14 *10 cm
f = 50 cm/s/ 62,8 cm
f = 0,79 1/s = 0,8 Hz
r=10cm
f=?
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obwód płyty
s=2*pi*r=2*pi*10cm=62,8cm
czas trwania 1 pełnego obrotu
V=s/t
t=s/V=62,8cm/50cm/s=1,25s
f=1/t=1/1,25s=0,8Hz - częstotliwość