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Консультация № 193865
09.11.2018, 23:26
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Здравствуйте! Прошу помощи в следующем вопросе:
Масляный гидравлический пресс имеет площадь левого поршня s1=20 см2 , правого —s2=100 см2. На какую высоту h опустится левый поршень, если на него поставить гирьку массой m=1,5 кг? Плотность масла p=0,9, г/см3.
Масляный гидравлический пресс имеет площадь левого поршня s1=20 см2 , правого —s2=100 см2. На какую высоту h опустится левый поршень, если на него поставить гирьку массой m=1,5 кг? Плотность масла p=0,9, г/см3.
Обсуждение
10.11.2018, 18:02
общий
это ответ
Здравствуйте, li.a!
После опускания левого поршня с гирькой на высоту
и поднятия правого поршня на высоту 
разность их уровней составляет 
Под левым поршнем гирька создаёт давление 
а на том же уровне под правым поршнем то же давление создаёт столб масла высотой 
поэтому
Объём масла, вытекшего из пространства под левым поршнем, равно объёму масла, поступившего в пространство под правым поршнем, то есть
Из выражений
и 
получим
(см).
После опускания левого поршня с гирькой на высоту
и поднятия правого поршня на высоту разность их уровней составляет Под левым поршнем гирька создаёт давление а на том же уровне под правым поршнем то же давление создаёт столб масла высотой поэтомуОбъём масла, вытекшего из пространства под левым поршнем, равно объёму масла, поступившего в пространство под правым поршнем, то есть
Из выражений
и получим (см).
Об авторе:
Facta loquuntur.
Facta loquuntur.
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