The density of physical iron is 7900kg / m3, the mass of an iron ball is 79g, and the volume is 15cc

The theoretical volume of 79g iron ball is 79g / 7.9g/cm & sup3; = 10cm & sup3;, so the hollow volume is 15-10 = 5cm & sup3;

RELATED INFORMATIONS

1. 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?
2. 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
3. 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
4. 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?
5. 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
6. If the ratio of density is 3:2, then the ratio of mass is 2______ ．
7. 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 ()
8. 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
9. 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
10. 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?
11. Conversion of iron density: 7.85 g / cm3 = 7850 kg / m3 =? Kg / cm3
12. The density of iron is 7900kg / cm3, the mass of an iron ball is 395kg, and the volume is 100cm3 (1) Is the iron ball solid or hollow (2) if it is hollow, what is the volume of the hollow part
13. With Archimedes, what is the buoyancy of 3.9kg iron in water? P the buoyancy of iron is 7.8kg/m3
14. How much does one cubic meter of iron weigh? How to calculate the known density of 7.86/
15. How much does a cubic meter of iron weigh?
16. Put the cube iron block weighing 77.42n on the tabletop with an area of 1m2. What is the pressure of the iron block on the tabletop? The density of iron is the third power of P = 7.9 * 10
17. A cube wood block with side length of 10cm and mass of 600g is placed on a table with an area of 1m2 to calculate the pressure and pressure on the table
18. A cube of 10 cm long and 12 N in weight is placed in the center of a horizontal table with an area of 1 square meter
19. Place the cube iron block with a mass of 7.8kg on the tabletop with an area of 1m2, and calculate the pressure? G of the iron block on the tabletop, taking 10N / kg
20. 1. Use 100N horizontal force to press the cube with side length of 10cm and weight of 60N on the vertical wall. What is the pressure and pressure on the wall? 2. What is the gravity of 225ml water?