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Консультация № 179366
01.07.2010, 20:16
0.00 руб.
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8
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Здравствуйте,
В цилиндрическое ведро диаметра D=25cм налита вода, занимающая объем V=12л. Каково давление р на стенку ведра на высоте h=10см от дна?
В цилиндрическое ведро диаметра D=25cм налита вода, занимающая объем V=12л. Каково давление р на стенку ведра на высоте h=10см от дна?
Обсуждение
Неизвестный
01.07.2010, 23:36
общий
это ответ
Здравствуйте, noobjkee!
За законам Паскаля давление во все стороны одинаковое.Поэтому нам надо найти давление на висоте h от дна и это будет давление на стенку ведра.
За законом Паскаля:
p=F/S,(1)
где F-силя тяготение воды,что находится над высотой h, S-площадь ведра.
(2) F=mg=ρ*(V-h*S)g;
С уравнений (1)-(2) имеем:
p=ρ*(4V-h*Pi*d^2)*g/Pi*d^2=1526 Па.
За законам Паскаля давление во все стороны одинаковое.Поэтому нам надо найти давление на висоте h от дна и это будет давление на стенку ведра.
За законом Паскаля:
p=F/S,(1)
где F-силя тяготение воды,что находится над высотой h, S-площадь ведра.
(2) F=mg=ρ*(V-h*S)g;
С уравнений (1)-(2) имеем:
p=ρ*(4V-h*Pi*d^2)*g/Pi*d^2=1526 Па.
02.07.2010, 12:12
общий
sashabailo:
p=F/S - формула, определяющая физическую величину "давление"
Закон Паскаля - "Давление, оказываемое на жидкость(или газ) в каком-либо одном месте передается без изменения во все точки жидкости(или газа).
p=F/S - формула, определяющая физическую величину "давление"
Закон Паскаля - "Давление, оказываемое на жидкость(или газ) в каком-либо одном месте передается без изменения во все точки жидкости(или газа).
Об авторе:
С уважением
shvetski
С уважением
shvetski
02.07.2010, 12:24
общий
это ответ
Здравствуйте, noobjkee.
Дано:
D=25 см = 0,25 м
V = 12 л = 12*10-3 м3
h = 10 см = 0,1 м
Найти: p
Решение:
Гидростатическое давление на глубине x
p=[$961$]*g*x = [$961$]*g*(H-h) (1)
где H - высота уровня воды, g=9.8 м/с2 - ускорение свободного падения, [$961$]=103 кг/м3 - плотность воды.
H=V/S = 4V/(pi*D2) (2)
после подстановки (2) в (1) получаем
p=[$961$]*g*((4V/(pi*D2)) - h)
p = 103*9.8*((4*12*10-3/(3.14*0.252)) - 0.1) = 1.4*103 Па
Удачи
Дано:
D=25 см = 0,25 м
V = 12 л = 12*10-3 м3
h = 10 см = 0,1 м
Найти: p
Решение:
Гидростатическое давление на глубине x
p=[$961$]*g*x = [$961$]*g*(H-h) (1)
где H - высота уровня воды, g=9.8 м/с2 - ускорение свободного падения, [$961$]=103 кг/м3 - плотность воды.
H=V/S = 4V/(pi*D2) (2)
после подстановки (2) в (1) получаем
p=[$961$]*g*((4V/(pi*D2)) - h)
p = 103*9.8*((4*12*10-3/(3.14*0.252)) - 0.1) = 1.4*103 Па
Удачи
5
Об авторе:
С уважением
shvetski
С уважением
shvetski
Неизвестный
02.07.2010, 12:57
общий
Shvetski:
Извините за беспокойство,но я сейчас посмотрел ответ символьно,и он выглядит следующим образом:
p=p+ρg((4V/(pi*D2)) - h)
з.ы. то есть различия только в плотности воды.Вы случайноне знаете откуда она появилась?
Извините за беспокойство,но я сейчас посмотрел ответ символьно,и он выглядит следующим образом:
p=p+ρg((4V/(pi*D2)) - h)
з.ы. то есть различия только в плотности воды.Вы случайноне знаете откуда она появилась?
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