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n(liczna obrotów)=1200
f-częstotliwość = n/t = 1200/120s= 10Hz
T(okres) = 1/f =1/10Hz= 1/10 s= 0,1 s
b) t=4min=240s
n=240
f=n/t=240/240s=1Hz
T=1/f=1/1Hz=1s
:D mam nadzieje, że pomogłam