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有些物理题可以从不同的思路进行分析而收到殊途同归的效果,既可以提高学生学习物理的兴趣,又有利于培养科学思维和分析问题的能力. 题目:有一内径均匀的U形管,其右端开口,左端装有气开关,内装水银。如左端有高度为h_1的空气柱,右端水银面比左端顶部高h_1/2,见图1所示.打开气开关,使左端放出部分气体,再关闭气开关,这时右端水银面恰与左端顶部在同一高度,见图2.求剩下空气质量与原空气质量之比.设大气压强为H厘米汞柱高,放气过程中大气压和温度都不变.
Some physical problems can be analyzed from different perspectives and receive the same results. This can not only improve students’ interest in learning physics, but also help develop scientific thinking and ability to analyze problems. Topic: U-shaped tube with uniform inner diameter, right end Open, left air switch, mercury inside. If there is an air column with a height of h_1 at the left end, the right side mercury surface is h_1/2 higher than the top of the left end, as shown in Fig. 1. Open the gas switch and let the left end discharge part of the gas, and then close the gas switch. At this time, the right side mercury surface is exactly to the left The top is at the same height, see Figure 2. Find the ratio of the remaining air mass to the original air mass. Set the atmospheric pressure to a height of H cm Hg. The atmospheric pressure and temperature will not change during the deflation.