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在解浮力问题时,学生对那些过程复杂、浮沉情况不明朗的题目颇感头疼,一般采用穷举法来求解,但是这种方法费时费力.下面笔者介绍一种较为简洁的假设修正法.一、同物异液,凑密度小的例1 将一实心物体先后投入足量水和酒精中,物体静止时,所受浮力分别为6 N 和5 N,判定物体在水和酒精中的浮沉状态可能是(ρ_酒=0.8×10~3kg/m~3)( )A.在水中漂浮,在酒精中漂浮B.在水中漂浮,在酒精中沉底C.在水中悬浮,在酒精中漂浮
In solving the problem of buoyancy, students are quite frustrated with those complicated processes and ambiguities in float conditions, which are usually solved by exhaustive methods, but this method takes time and effort. The following is a brief introduction of a simple hypothetical correction method. , The same material with the fluid, the compact density of small example 1 will have a solid object has been put enough water and alcohol, the object is stationary, the buoyancy were 6 N and 5 N, determine objects in water and alcohol floating state May be (ρ_ wine = 0.8 × 10 ~ 3kg / m ~ 3) () A. Floating in water, floating in alcohol B. Floating in water, sinking in alcohol C. Floating in water, floating in alcohol