d=20 cm=0,2 m
v=31,4 m/s
f=?
f=n/t
t=1 s
n=?
n=s/l (l - obwód tarczy)
s=v*t
s=31,4*1
s=31,4 m
l=2πr
l=2*3,14*0,1
l≈0,63 m
n=31,4/0,63
n≈50
f=50/1
f=50 Hz
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d=20 cm=0,2 m
v=31,4 m/s
f=?
f=n/t
t=1 s
n=?
n=s/l (l - obwód tarczy)
s=v*t
s=31,4*1
s=31,4 m
l=2πr
l=2*3,14*0,1
l≈0,63 m
n=31,4/0,63
n≈50
f=50/1
f=50 Hz