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应用密度知识,可以解决不少实际问题.下面分类举例说明. 一、求不能直接称量的物体质量例1矗立在天安门广场的人民英雄纪念碑,它的碑心石是一整块巨大的长方体花岗岩,怎样知道这块碑心石的质量? 解析:从密度公式,p=m/v,利用公式变形可得m=pV,这个式子就是求不能直接称量的物体质量的很方便的办法.
The application of density knowledge can solve a lot of practical problems. The following classifications are used for illustration. First, ask for objects that cannot be weighed directly. Example 1 The Monument to the People’s Heroes stands in Tiananmen Square, and its monumental stone is a massive block of rectangular granite. How do you know the quality of this piece of stone? Analysis: From the density formula, p = m / v, the use of formula deformation can be obtained m = pV, this formula is to find the object can not be directly weighed mass is a very convenient way.