Предмет: Физика, автор: kirilllolz

Моток медной проволоки, площадь сечения которой 2 мм², имеет массу 17,8 кг.
Как,не разматывая моток узнать длину проволоки?чему она равна? ρ=8900 кг/м³

Ответы

Автор ответа: Аноним
0
S = 2 мм² =2*10^-6 м²,
масса  m = V*ρ
объем  V = S*L
длина   L = V/S = (m/ρ) / S = (17.8/8900) / 2*10^-6 = 1000 м = 1 км
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