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g=10 mm=0,01 m, L=100 mm=0,1 m
naprężenia dopuszczalne
б=0,8 kr=F/S=F/gL
dopuszczalna siła
F=0,8krgL
F= 0,8*130*10^6*0,01*0,1=104 000 N
F= 104 kN