Предмет: Физика, автор: mazitoff

под водой на глубине 10м отломили нижний конец запаянной стеклянной пробирки, ив нее вошло m=2г воды.Каким было давление р1 в запаянной пробирке? Объем пробирки равен 4см3 ,а атм.давл.=10х5па.

Ответы

Автор ответа: aleksobuhov350

Вода занимает место в пробирке, давление газа в пробирке увеличивается из-за того, что объем воздуха в пробирке уменьшается.
V₀=4*10⁻⁶ м³; V₁=V₀-Vводы=V₀-m/ρ;
V₁=4*10⁻⁶ - 2*10⁻³/1000=2*10⁻⁶ м³
Температура не изменяется, значит мы можем применить закон Бойля-Мариотта P₀V₀=P₁V₁; P₁=P₀V₀/V₁;
$P_1=pgh+Patm; frac{P_0V_0}{V_1}=pgh+Patm; P_0= frac{(Patm+pgh)V_1}{V_0}$
P₀- давление воздуха в пробирке до опускания в воду
P₁- давление воздуха в пробирке после заполнения некоторой части пробирки водой.
P₀=(10⁵+1000*10*10)2*10⁻⁶/(4*10⁻⁶)=100000 Па=100 кПа
Ответ: P₀=100 кПа

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