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特殊浮力问题主要有四类第一类,密合问题密合可分侧壁密合和底部密合,侧壁密合如图1,物体受到一个向右的水的压力,但此力与器壁对物体问左的压力相平衡,对浮力没有影响,此时 F_浮=F′-F. 底部与容器密合时(图2),物体前后侧面,左右侧面受力平衡,上表面受到液体对物体向下的压力,而下表面未受到液体对物体向下的力,所以,没有向上的浮力,不但没受到向上的浮力,反而受液体对物体向下的压力,这也是为什么潜水艇不敢潜入海底的原因.例1:如图3,由两个园柱组成的 T 形物体,上、下底面半径分别为 a、b,高度分别为 c、d,容
There are four types of special buoyancy problems. There are four types of special buoyancy problems. Adhesion problems can be divided into closely-packed sidewalls and closely-packed bottoms. The sidewalls are closely matched as shown in Figure 1. The object is subjected to a rightward pressure of water, but this force The pressure left by the wall is balanced with respect to the object and has no effect on the buoyancy. F_float = F’ - F. When the bottom is in close contact with the container (Figure 2), the front and rear sides of the object are balanced by force, and the top surface is subjected to force balance. The downward pressure of the liquid on the object, and the lower surface is not subjected to the downward force of the liquid on the object. Therefore, there is no upward buoyancy, not only the upward buoyancy, but the downward pressure of the liquid on the object, which is why the submarine Reasons for not diving into the seabed. Example 1: As shown in Figure 3, a T-shaped object consisting of two cylinders, the upper and lower bottom radii are a and b, and the heights are c and d, respectively.