我市几年物理竞赛考试中,有几道浮力考题考生错误较多。分析原因,是他们缺乏正确的解题思路,不能把繁难的问题简易化。现举例说明解题时的分析思路和“隔离”排难的灵活方法。例1:一质量为 m,半径为 r,体积为ν的半球,放在密度为ρ的液体中,且半球和容器底部紧密接触。若液体的深度为 h,则半球对器底的压力为: In the city’s physical examination for several years, there were several more buoyancy candidates. The reason for the analysis is that they lack the correct problem-solving ideas and cannot simplify the difficult problems. This is an example of the analytical approach to problem solving and the flexible method of “isolating” and troubleshooting. Example 1: A hemisphere with mass m, radius r, and volume ν is placed in a liquid with a density of ρ, and the hemisphere is in close contact with the bottom of the container. If the depth of the liquid is h, the pressure at the bottom of the hemisphere is: