The three solid cubes a, B and C are respectively placed on the horizontal ground, and their pressures on the horizontal ground are equal. It is known that ρ a ＞ ρ B ＞ ρ C. If a force in the same direction along the vertical direction is applied to the center of the three cubes (the applied force is less than the gravity of the cube), so that the pressures of the three cubes on the horizontal ground are still equal, then the pressure is equal The magnitude of the applied force () A. It must be f a ＜ F B ＜ F C B. it must be f a = f b = f C. It may be f a ＞ F B ＞ f C. all the above situations are possible

The three solid cubes a, B and C are respectively placed on the horizontal ground, and their pressures on the horizontal ground are equal. It is known that ρ a ＞ ρ B ＞ ρ C. If a force in the same direction along the vertical direction is applied to the center of the three cubes (the applied force is less than the gravity of the cube), so that the pressures of the three cubes on the horizontal ground are still equal, then the pressure is equal The magnitude of the applied force () A. It must be f a ＜ F B ＜ F C B. it must be f a = f b = f C. It may be f a ＞ F B ＞ f C. all the above situations are possible

Because the three solid uniform cubes a, B and C are placed on the horizontal ground, the pressure on the horizontal ground is the same, so their pressure can be expressed by P = ρ GH, and because their density relation is ρ a ＞ ρ B ＞ ρ C. Therefore, from P = ρ GH, we can know that h a ＜ H B ＜ H C, so s a ＜ s B ＜ s C