R=U/I=4/8=0,5 Ом R=p*L/S L=R*S/p=0,5*1/0,017=29,4 м
m=pм*S*L=8900*10^-6*29,4=0,26 кг
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R=U/I=4/8=0,5 Ом R=p*L/S L=R*S/p=0,5*1/0,017=29,4 м
m=pм*S*L=8900*10^-6*29,4=0,26 кг