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Консультация № 186967
18.12.2012, 13:33
150.00 руб.
0
1
1
Здравствуйте! У меня возникли сложности с такими вопросами:
Задача 1.
Укажите на рисунке высоты столбов жидкости, соответствующие давлениям:
1-Абсолютному давлению в точке М
2-Избыточному давлению в точке М
3-Избыточному давлению на свободной поверхности
4-Атмосферному давлению
Задача 2.
Найдите силу гидростатического давления на малый поршень, если сила, приложенная к большому поршню равна P1 и S2/S1=0,3
Задача 1.
Укажите на рисунке высоты столбов жидкости, соответствующие давлениям:
1-Абсолютному давлению в точке М
2-Избыточному давлению в точке М
3-Избыточному давлению на свободной поверхности
4-Атмосферному давлению
Задача 2.
Найдите силу гидростатического давления на малый поршень, если сила, приложенная к большому поршню равна P1 и S2/S1=0,3
Обсуждение
18.12.2012, 17:43
общий
это ответ
Здравствуйте, Дмитрий!
1. В соответствии с законом Паскаля, в изображённом на рисунке устройстве давление во всех точках жидкости при действии силы
одинаково, поэтому
откуда найдём
2. Думаю, что задачу можно решить следующим образом.
Сосуд закрытый. Давление на свободной поверхности сосуда больше атмосферного. Пьезометрическая высота соответствует величине избыточного давления в точке М, поэтому
при этом
Вакуумметр, установленный внутри сосуда, показывает абсолютное давление в точке М, поэтому
И поскольку атмосферное давление равно разности между абсолютным и избыточным давлениями, постольку
С уважением.
1. В соответствии с законом Паскаля, в изображённом на рисунке устройстве давление во всех точках жидкости при действии силы
одинаково, поэтомуоткуда найдём
2. Думаю, что задачу можно решить следующим образом.
Сосуд закрытый. Давление на свободной поверхности сосуда больше атмосферного. Пьезометрическая высота соответствует величине избыточного давления в точке М, поэтому
2) избыточному давлению в точке М соответствует сумма высот, обозначенных на рисунке цифрами "2" и "4",
при этом
3) избыточному давлению на свободной поверхности сосуда соответствует высота, обозначенная на рисунке цифрой "4".
Вакуумметр, установленный внутри сосуда, показывает абсолютное давление в точке М, поэтому
1) абсолютному давлению в точке М соответствует высота, обозначенная на рисунке цифрой "3".
И поскольку атмосферное давление равно разности между абсолютным и избыточным давлениями, постольку
4) атмосферному давлению соответствует высота, обозначенная на рисунке цифрой "1".
С уважением.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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