Удельное сопротивление железа 1*10^-7Ом*м,
R=pl\s;
R=1*10^-7*650000\0.000012=5416.6Ом.
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160 шт
Объяснение:
Дано: СИ: Решение:
m(max) = 8т 8000кг m = ρV; V = abc
a = 2 м V = 2м · 0.8м · 0.004м
b = 80 см 0.8 м = 0.0064 
c = 4 мм 0.004 м m = 0.0064
· 7800кг =
ρ = 7800 кг/ = 49.92 кг
m = ? 8000кг/
49.92кг ≈ 160 шт
ответ: 160 пластин
p - удельное сопротивление, 0,098 Ом*кв.мм/м
R=p*l/S=0.098*650000/12=5308.3