m*g=сигма*pi*d сигма=m*g/pi*d=11,7*10^-6*9,8/3,14*0,5*10^-3=73*10^-3 Н/м=73 мН/м
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m*g=сигма*pi*d сигма=m*g/pi*d=11,7*10^-6*9,8/3,14*0,5*10^-3=73*10^-3 Н/м=73 мН/м