A. B when two square solid metal blocks are placed on the horizontal ground, their side length ratio is 1:3, and the pressure ratio to the ground is 2:3, the density ratio of the two metals is () A. 4：9B. 9：4C. 1：2D. 2：1

According to P = FS = GS = MGS = ρ sghs = ρ GH, papB = ρ Agha, ρ aghb = ρ aha, ρ BHb = ρ a × 1, ρ B × 3 = 23, then ρ a, ρ B = 21

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1. A rectangular iron block with a density of 7.9 * 10 ^ 3kg / m ^ 3 is 20cm long, 10cm wide and 5cm thick. How much pressure does the iron block exert on the desktop when it is placed horizontally or vertically?
2. There is a kind of brick with thickness of 5cm and density of 2.5 × 10 & sup3; kg / M & sup3. When it is laid flat on a horizontal plane, the pressure on the ground is? There is a kind of brick with thickness of 5cm and density of 2.5 × 10 & sup3; kg / M & sup3; 1. What is the pressure on the ground when it is placed horizontally? 2. This kind of brick is used to build 18m high wall, and the cement slurry with density of 2.0 × 10 & sup3; kg / M & sup3; is filled between the upper and lower layers and the gap between the wall base. The thickness of the cement slurry is known to be 1cm, so what is the pressure on the ground?
3. The length, width and height of a brick are 20cm, 10cm and 5cm respectively, and its density is 1500kg / m3. Put it on the horizontal ground and calculate its impact on the ground The best calculation process reference answer: maximum 3000 minimum 750
4. Put a piece of iron, 10cm long, 10cm wide and 5cm thick, flat on the 1m desktop, and calculate the pressure on the desktop Put a piece of iron 10cm long, 10cm wide and 5cm thick on the 1m & sup3; table, and calculate the pressure on the table. If you saw half of the iron along the dotted line as shown in the figure, what is the change of the pressure and pressure of the iron on the table? If the iron block is cut horizontally and horizontally, what will happen?
5. A square iron block with a mass of 7900g is placed in the center of a horizontal table with an area of 200cm & sup2; to calculate the pressure of the iron block on the table
6. Place a 7.9kg cube solid iron block in the center of a square horizontal table with an area of 0.5m2. Calculate the pressure of the iron block on the table (ρ Fe = 7.9 × 103kg / m3, g = 10N / kg) I'm a sophomore. Please write like a sophomore I have to write it myself
7. The homogeneous cube wood block with side length of 10 cm is still on the water surface, and its lower surface is 8 cm (g = 10 N / kg) from the water surface?
8. A cube wood block with a density of 0.6 × 10 ᦉ kg / m ᦉ 179; and a side length of 10 cm is still on the water surface (1) The gravity on the block (2) Buoyancy of wood block (3) At least how much force must be applied on the surface of the block to make it completely immersed in water. (g = 10N / kg)
9. A cube wood block with density of 0.6 × 103kg / m3 and edge length of 10cm is pulled by rope and immersed in water Please do not copy and paste
10. There is a cubic block of wood with density of 0.6 * 10 ^ 3kg / m3 and side length of 10cm immersed in water, as shown in the figure. If the pulling force on the block is 39.2n, the floating force on the block can be calculated The picture shows: a piece of wood suspended in water, 5cm away from the liquid level (in three ways)
11. As shown in the figure, a and B are two cubes, and their density ratio is 1:3. Place a and B on the horizontal table, and the pressure on the table is equal If the pressure of a on the table is FA and PA after B is placed on a, and the pressure of B on the table is FB and Pb after a is placed on B, then the ratio of FA to FB is_ The ratio of PA to Pb is
12. A cube with edge length a and density ρ is stationary on a horizontal table. Its pressure on the table is () A cube with edge length a and density ρ is stationary on a horizontal table. Its pressure on the table is () if the edge length of the cube is doubled (the density remains unchanged), then its pressure on the ground is ()
13. If the ratio of density is 3:2, then the ratio of mass is 2______ ．
14. When the cube A and cube B are placed on the horizontal table, their pressure on the table is equal, and the ratio of pressure is 9:4, then the ratio of density of cube A and cube B is () A. 2：3B. 3：2C. 1：1D. 4：9
15. A cube iron block weighing 77.42n is placed in the center of a 1m cubic horizontal tabletop. What is the pressure of the iron block on the tabletop?
16. The 7.9kg cube iron is still in the center of the horizontal tabletop of 1m and 178; to calculate the pressure of the iron on the tabletop
17. A rectangular metal block placed on a horizontal plane, its volume is V, its density is ρ, its gravity is g, and its pressure on the table top is p. if it is cut half vertically from the middle, the following statement is correct () A. V, P, G and P all become half of the original, B. P, G and P all remain unchanged, V becomes half of the original, C. P remains unchanged, V, G and P all become half of the original, D. P and P remain unchanged, V and G all become half of the original
18. A cube with a length of 10cm and a gravity of 2.7N is placed in the center of a 1m ^ 2 horizontal table. What is the pressure on the table?
19. The density of physical iron is 7900kg / m3, the mass of an iron ball is 79g, and the volume is 15cc
20. Conversion of iron density: 7.85 g / cm3 = 7850 kg / m3 =? Kg / cm3