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华东师范大学出版社出版的高中物理竞赛考前训练《赛前集训》一书第13页第9题如下:一个具有正方形截面的均匀长木块浮在水中,这个木块或以两个相对的侧面平行于水面,或以4个侧面都和水面成45°角,如图1所示,试问其平衡后的位置可能是图中的哪一种?说明理由(设水的密度为ρ0,木块的密度为ρ).
East China Normal University Publishing House published high school physics competition exam pre-training “pre-game training,” a book on page 13, No. 9 is as follows: a square cross-section of the uniform length of wood floats in the water, the wood or in two opposite Side of the parallel to the surface of the water, or to the four sides and the water surface at a 45 ° angle, as shown in Figure 1, to ask the balance of the location may be in the picture? Explain the reason (set water density ρ0, wood The density of the block is ρ).