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今年物理高考后,不少人对第六大题不甚理解,他们有一个共同的疑问:玻璃管起初浮在水面,所受浮力与其重力大小相等,既然玻璃管被压入水中后,所受浮力越来越小,怎么可能还有一个位置,它受到的浮力又等于重力呢?为了解答这个疑问,我们探讨一下玻璃管在水中所受浮力的变化规律。如图1,把上端 A 封闭,下端 B 开口的玻璃管插入
After this year’s physics college entrance examination, many people did not understand the sixth question. They had a common question: The glass tube first floated on the surface of the water, and the buoyancy force was equal to its gravity. Since the glass tube was pressed into the water, it suffered As buoyancy is getting smaller and smaller, how can there be a position where the buoyancy force it receives is equal to gravity? To answer this question, we will explore the buoyancy of glass tubes in water. As shown in Fig. 1, the upper end A is closed and the lower end B is opened with a glass tube inserted