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The density of physical iron is 7900kg / m3, the mass of an iron ball is 79g, and the volume is 15cc. What is the volume and density of the iron ball?
Volume you mean 15? Density = mass divided by volume = 79 △ 15 =? G / cubic centimeter
If the density of iron is 7900kg / m3, the mass of iron ball is 395g and the volume is 100cm3, is the iron ball hollow or solid?
If it is hollow, how small is the volume of the hollow part?
Volume = mass divided by density
395 grams of iron ball should have a volume of 50 cubic centimeters
So it's hollow
The hollow part is 50 cubic centimeters
Two metal cylinders stand on the horizontal table, the ratio of their bottom area is 8:9, the ratio of their density is 9:8, and the ratio of the pressure on the table is 3:2. Then the ratio of the height of the two metal cylinders is 8:9______ ．
The pressure of cylinder on horizontal table is: P = FS = GS = MGS = ρ VGS = ρ SHGs = ρ GH, because ρ 1: ρ 2 = 9:8, P1: P2 = 3:2, so according to h = P ρ g, we can get: H1H2 = P1 ρ 1gp2 ρ 2G = p1p2 × ρ 2, ρ 1 = 32 × 89 = 43
RELATED INFORMATIONS
- 1. Two metal cylinders stand on the horizontal table, the ratio of their bottom area is 8:9, the ratio of their density is 9:8, and the ratio of the pressure on the table is 3:2. Then the ratio of the height of the two metal cylinders is 8:9______ ．
- 2. If 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 0 In order to prepare a certain mass fraction of dilute sulfuric acid, when measuring the concentrated sulfuric acid with the dosage cylinder, look down on the scale, and when measuring the water, look up on the scale, why is the mass fraction smaller than the requirement?
- 3. 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
- 4. The density ratio of a and B is 2:1 and the side length ratio is 1:2. Place a in the center of B and place B on the horizontal table Find the ratio of the pressure of a to B and the pressure of B to the ground
- 5. A rectangular iron block with a length of 10 cm, a width of 8 cm and a height of 5 cm is melted and cast into a cylindrical iron block with a diameter of 20 cm, and the height of the cylindrical iron block is calculated
- 6. As shown in the figure, a beaker with a bottom area of 100cm & sup2; was originally filled with 8.5cm deep water, and a beaker with a mass of 55g and an average density of 1.1 × 10 & sup3; kg / m The buoyancy of an egg immersed in water 2. The pressure of water on the bottom of the container after putting in the eggs. (G is 10N / kg) thank
- 7. The length, width and thickness of a brick are 20cm, 10cm and 5cm respectively, and the mass is 2kg. When the brick is placed on the horizontal ground in different ways, what are the maximum and minimum pressures of the brick on the horizontal ground? (take g = 10N / kg)
- 8. There is a long, wide, high 20cm, 10cm, 5cm rectangular wood block. When it is placed horizontally, vertically, and laterally, the ratio of its pressure on the desktop () and the ratio of its pressure ()
- 9. A cube solid iron block with a mass of 7.9kg is placed in the center of a horizontal tabletop with an area of 0.5m2. What is the pressure of the iron block on the tabletop? (the density of the iron is 7.9 × 10 & # 179; kg / M & # 179;, g = 10N / kg)
- 10. Solid cube wood block with side length of 10cm, density of 0.6 × 10 ｛ kg / m ｛ 179;; is still in a container with enough water, and its upper and lower bottom surfaces are smooth Parallel to the water surface, (the wood block is not completely immersed in water) calculation: 2. The buoyancy of the wood block in the water 3. The volume of the wood block immersed in the water 4. The pressure of water on the ground under the wood block. (g = 10N / kg)
- 11. In order to judge whether an iron ball is hollow or not, the density of iron is 7.9g/cm3, the mass of iron ball is 79, and the volume of water is 60.0 The total volume of water and iron balls is 75.0 1. Is the ball hollow or solid 2. If the ball is hollow, what is the volume of the hollow part
- 12. How much buoyancy does 11.7kg iron block get when it is immersed in water? (iron density 7.8G / cm3) aluminum block gets buoyancy 2.94n when it is immersed in water, and the mass of aluminum block is 1. What is the mass of the aluminum block when immersed in water? (aluminum block density: 2.7g / cm3) 2. What is the buoyancy when half of the 120cm3 stone is immersed in alcohol? (alcohol density: 0.8g / cm3) 3. What is the volume of the stone when immersed in alcohol is 0.392n? 4. The buoyancy when a stone is immersed in water is 3.92n, How much buoyancy do you get when you immerse it in alcohol? 5. A stone weighs 29.4n, and when you immerse it in water, it weighs 19.6n?
- 13. What is the buoyancy of a 79g iron when it is put into water? (the known density of iron is 7.9 * 10 ^ 3kg / m ^ 3)
- 14. How much does a cubic meter of air weigh
- 15. There is a cube with a side length of 10cm and a weight of 12n, which is placed in the center of the horizontal desktop with an area of 1 m2. At this time, what is the pressure of the cube on the desktop?
- 16. There is a 10 cm long cube with a mass of 7.8 kg, which is placed on the table with an area of 1 square meter (1) What is the density of the block? (2) what is the pressure of the block on the desktop? (3) what is the pressure of the block on the desktop?
- 17. What is the pressure on a square table with an area of 1 square meter and a weight of 20 N What is the pressure on the table when a 20 N cube with an area of 0.5 square meters is placed on a horizontal table with an area of 1 square meter?
- 18. A cube iron block with a mass of 7.8kg is placed in the center of a horizontal tabletop with an area of 0.5m & sup2;, and the following questions are asked: (1) how much PA is the pressure of the iron block on the tabletop? (2) how much PA is the pressure of the iron block on the tabletop if a force of 12n is applied on the iron block along the vertical direction? (ρ iron = 7.8 × 10 & sup3; kg / M & sup3;
- 19. The cube iron block with a mass of 7.9kg is placed on the horizontal table with an area of 0.5m2. What is the pressure on the horizontal table? V iron = m / ρ = 7.9kg/7.9 × 103kg / m3 = 0.001m3, so the side length of iron block is 0.1M, and the bottom area s = 0.01m2 So s = 0.01m2, P = mg / S = (7.9kg × 10N / kg) / 0.01m2 = 7900pa Because the area of the table is larger than the bottom area of the iron block, the contact area is the bottom area of the iron block
- 20. There is a cube aluminum block with a mass of 2700g. Put it on the horizontal table with an area of 0.5m2, and calculate the pressure of the aluminum block on the horizontal table (known density of aluminum block is 2.7 * 10 ^ 3kg / m3) G please take 9.8n/kg