Предмет: Физика, автор: dimonximi9

к куску железа массой 200 г привязали пробковый поплавок . Какой минимальный обьем пробки понадобится чтобы он не упал на дно?плотность пробки 150кг/м^3

Ответы

Автор ответа: Фантомасис

В предельном случае кусок железа и поплавок погружены в воду полностью, но не тонет. Поэтому сила Архимеда уравновешивается силой тяжести железки и поплавка.

pв*g*(Vп+Vж)=(mж+mп)*g

Подставив в это уравнение известное и вместо mп подставив Vп*pп, получим: Vп=206cм3

Ответ: 206см3

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