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一般情况下,当ρ物<ρ液时,物体漂浮,物体受到的浮力等于物体的重力.但这个结论未必恒成立. 例1 有一个柱形容器,它的底面是正方形,边长为20cm,容器内装满水,水深为8cm.现有一边长为15cm的正方体木块,密度为0.6×103kg/m3,将木块放入容器中,求木块静止时所受到的浮力是多少?(g=10N/kg) 错解已知ρ木<ρ水,所以木块在水中漂
Under normal circumstances, when the ρ object < liquid, the object floats, and the buoyancy of the object is equal to the gravity of the object. However, this conclusion may not always be established. Example 1 There is a cylindrical container with a square bottom and a side length of 20cm. The container is filled with water and has a water depth of 8 cm. The existing cube with a side length of 15 cm has a density of 0.6 x 103 kg/m3. Put the wooden block into the container. What is the buoyancy that the wood block receives when it is stationary? ( g=10N/kg) Misunderstood known ρ wood< ρ water, so the wood floats in the water