《物理教学》1992年第1期,刊登了《几道初中物理竞赛题》一文,读后颇受益处。现对例1提供另一种解法。例1 有一质量为 m,半径为 r 体积为 V 的半球,放在盛有密度为 p 的液体的容器底部,它与底部紧密接触(即它与底面间无液体),如图1所示。若液体的深度为 H,问半球对底面的压力是多大?[选自90年四川省第五届初中力学竞赛(决赛)试题] “Physics Education” in the first period of 1992, published “a few junior high school physics contest questions” article, after reading quite a benefit. Example 1 is now provided with another solution. Example 1 A hemisphere with a mass m, radius r, and volume V is placed on the bottom of a vessel containing a liquid of density p, which is in close contact with the bottom (i.e., there is no liquid between it and the floor), as shown in FIG. If the depth of the liquid is H, what is the pressure of the hemisphere on the bottom? [From the 90th Sichuan Provincial Fifth Junior Mechanics Competition (Final) Test Questions]