Сторона а====0,2м
P=mg/S=ρVg/S=ρaSg/S=ρag=7800*0,2*10=15600Па=15,6кПа
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Сторона а====0,2м
P=mg/S=ρVg/S=ρaSg/S=ρag=7800*0,2*10=15600Па=15,6кПа