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在有关浮力的计算中,我们经常会遇到一些液面变化的问题,如何解决这些问题呢?下面试举例说明.例1一小块冰漂浮在量筒中的水面上,当它完全熔化后其液面将()(A)升高(B)不变(C)下降(D)无法判断解题思路:可以先设未放入冰时量筒中水的体积为V1,放入冰后量筒示数为V2,以及冰熔化加入量筒后的总体积为V3,如图1所示.比较V2和V3就可以液面变化情况.
In the calculation of buoyancy, we often encounter some liquid level changes, how to solve these problems? Here’s an example to illustrate Example 1 A small piece of ice floats on the surface of water in the measuring cylinder, when it is completely melted Liquid level will () (A) increase (B) unchanged (C) decline (D) can not determine the problem solving ideas: you can first set the volume of water in the graduated cylinder is not placed in the ice V1, into the ice cylinder The number of V2, and the total volume of ice melt after adding the cylinder is V3, as shown in Figure 1. V2 and V3 can be compared to the liquid level changes.