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Консультация № 200798
06.05.2021, 16:40
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос: Космонавт, находящийся за пределами космического корабля, открывает вентиль газового баллона (площадь поперечного сечения выходного отверстия S). При этом возникает реактивная сила F = 6 Н. Начальная концентрация газа в баллоне n=2,6*10^26 м^-3, средняя квадратичная скорость молекул газа в баллоне <v> = 0.4 км/с. Газ Не (гелий). Найти S выходного отверстия.
Обсуждение
06.05.2021, 17:13
общий
06.05.2021, 17:14
это ответ
Здравствуйте.
Дано:
F=6Н
n=2,6*1026м-3
<v>=0,4*103м/с
(He)
Найти: S
Решение:
1. Давление на площадку площадью S по определению
p=F/S (1)
2. Давление газа (согласно основному уравнению МКТ)
p=(1/3)n*mo*<v2> (2)
3. Масса молекулы
mo=M/NA (3)
- здесь
M=4*10-3 кг/моль - молярная масса гелия;
NA=6*1023 моль-1 - число Авогадро.
Решая систему уравнений (1), (2), (3)
получаем
S=3FNA/(nM<v2>)
После подстановки и расчетов
получаем
S=6,5*10-5м2 = 0,65 см2.
*****
Удачи
Дано:
F=6Н
n=2,6*1026м-3
<v>=0,4*103м/с
(He)
Найти: S
Решение:
1. Давление на площадку площадью S по определению
p=F/S (1)
2. Давление газа (согласно основному уравнению МКТ)
p=(1/3)n*mo*<v2> (2)
3. Масса молекулы
mo=M/NA (3)
- здесь
M=4*10-3 кг/моль - молярная масса гелия;
NA=6*1023 моль-1 - число Авогадро.
Решая систему уравнений (1), (2), (3)
получаем
S=3FNA/(nM<v2>)
После подстановки и расчетов
получаем
S=6,5*10-5м2 = 0,65 см2.
*****
Удачи
5
Об авторе:
С уважением
shvetski
С уважением
shvetski
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