a=4*pi^2*v^2*d/2 v=sqrt(a/2*pi^2*d)=sqrt(9,9/2*10*0,01)=7 Гц N=v*t=7*60=420
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a=4*pi^2*v^2*d/2 v=sqrt(a/2*pi^2*d)=sqrt(9,9/2*10*0,01)=7 Гц N=v*t=7*60=420