V=2πRv
v=V/(2πR)=15/(2*3*0,02м)=125(Гц)
T=1/v=1/125=0,008(c)
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V=2πRv
v=V/(2πR)=15/(2*3*0,02м)=125(Гц)
T=1/v=1/125=0,008(c)