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例1质量是25千克的正方体，边长为50厘米，把它分别放在面积均为3600厘米’的三张桌面上，桌面的几何形状如图1所示．则桌面承受的压强可能是O．10牛／厘米’．（取g一10牛／千克）．［四川省第七届中学生力学竞赛（初赛）第10小题］周析桌面所受的压强等于正方体对桌面的压力
Example 1 The mass is a 25 kilogram cube with a side length of 50 cm. It is placed on three desktops each with an area of 3,600 cm. The geometry of the table is shown in Figure 1. The pressure on the desktop may be O. 10 N/cm. (take g-10 cattle/kg). [Sichuan Province seventh middle school student mechanics competition (preliminary competition) 10th topic] Zhou pressure desktop pressure is equal to the cube pressure on the desktop