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在中考物理综合题中,常涉及物理临界状态,如何处理临界状态下的临界条件?处理不好,过程会繁琐,让人费解;若巧妙转化,则能使问题明朗、易理解,现以一题的讨论作一说明:题目 (泰州中考)如图所示的容器,上、下两部分为柱状,上部足够长,截面积为200cm~2下部高为4cm,底面积为300cm~2;长方体木块高为20cm,底面积为160cm~2,其底部中
In the physics comprehensive examination of the senior high school entrance examination, physical critical state is often involved. How to deal with critical conditions in the critical state? The handling is not good, the process is tedious, and people are incomprehensible; if the transformation is sensible, it can make the problem clear and easy to understand. The discussion of the questions gives a description: the title (Taizhou College Entrance Examination) container as shown in the figure, the upper and lower parts are columnar, the upper part is long enough, the cross-sectional area is 200cm-2, the lower height is 4cm, and the base area is 300cm-2; The block height is 20cm, the bottom area is 160cm~2, and its bottom is