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天平是专门用于称量物体质量的一种测量仪器,假如在实验中巧妙地利用各物理量之间的数量变换关系,便能拓宽天平的使用范围,解决许多实际的问题,请看下面各例. 一、用天平“称”面积例1 地图上标示的边界线都很不规则,因此我们很难直接从地图上估算出某一国家(或地区)的实际面积.现有天平一架,硬纸片和复写纸各一张,刻度尺和剪刀各一把,地图一幅.你怎样利用这些工具测出地图上某一国家
The balance is a measuring instrument that is specially used to weigh the mass of an object. If the quantity transformation relationship between various physical quantities is used skillfully in experiments, the scope of use of the balance can be broadened and many practical problems can be solved. Please see the following examples. 1. Weighing Area with Scales Example 1 The boundary lines marked on the map are very irregular, so it is difficult to estimate the actual area of a certain country (or region) directly from the map. One existing balance is hard. One piece of paper and copy paper, one each with scale and scissors, one on the map. How do you use these tools to measure a country on the map?