Weighing an object with a spring scale, weighing in air is three times of weighing in water, we can know that the density of the object is__ Kg / M cubic

one thousand and five hundred

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1. The volume of a stone is 20cm3, and its density is 3 * 10 cubic kg / m3. It is calculated by immersing it in water with a spring scale: (G is 10N / kg) (1) How much buoyancy does the stone bear? (2) What is the gravity of the stone? (3) When immersed in water, what is the indication of the spring scale?
2. The density of metal cylinder a is 5 * 10 cubic kilogram per cubic meter, The density of metal cylinder a is 5 * 10 cubic kilogram per cubic meter, the volume is 2 * 10 negative cubic meter, and the bottom area is 1 * 10 negative quadratic square meter. The height of thin-walled cylindrical container B is 0.3m, the bottom area is 2 * 10 negative quadratic square meter, and the water depth in the container is 0.25m If the object a is immersed in the water of the container B with a rope, calculate the increase of the water pressure on the bottom of the container B
3. The total volume is 1 cubic decimeter and the area is 1 square meter The total volume of the craftwork is 1 cubic decimeter, which is made of the alloy material with the density of 8,0 × 10 cubic kg cubic meter. The area is 1 square meter, and the contact area of the swallow on the horizontal table is 20 square meters. What is the quality of the craftwork
4. A bottle can be made into 1kg of water. This bottle can hold 900g of oil. How about the density of this oil?
5. Pour the vegetable oil into the water, and the vegetable oil can float on the water surface. Is the density of the water high or that of the vegetable oil high
6. A bottle can hold up to 1kg of water. How much edible vegetable oil can you hold in this bottle? (ρ water = 1.0 × 103 & nbsp; kg / m3, ρ oil = 0.9 × 103 & nbsp; kg / m3)
7. A bottle can hold up to 1kg of water. How much edible vegetable oil can you hold in this bottle? (ρ water = 1.0 × 103 & nbsp; kg / m3, ρ oil = 0.9 × 103 & nbsp; kg / m3)
8. A bottle can hold up to 1kg of water. How much edible vegetable oil can you hold in this bottle? (ρ water = 1.0 × 103 & nbsp; kg / m3, ρ oil = 0.9 × 103 & nbsp; kg / m3)
9. A bottle can hold up to 1kg of water. How much edible vegetable oil can you hold in this bottle? (ρ water = 1.0 × 103 & nbsp; kg / m3, ρ oil = 0.9 × 103 & nbsp; kg / m3)
10. If someone goes to the store to buy 5kg of oil with the density of 0.8 * 10 cubic kg / m3, but he only has a bottle with the maximum capacity of 0.5kg of water on hand, he should bring such a bottle Can you plan to list it?
11. It is known that the water binder ratio of concrete is 0.5, the water consumption of concrete is 180kg, the sand ratio is 33%, assuming that the apparent density of concrete is 2400KG / m, try to calculate the amount of each material (without mineral admixtures and chemical admixtures)
12. It is known that the water cement ratio is 0.6, the sand rate is 35%, the cement content is 350, and the sand content is 650. How to calculate the water and stone consumption for 1 cubic meter
13. A kind of concrete is made of cement, yellow sand and stones in the ratio of 2:3:5. How many tons of cement, yellow sand and stones are needed to prepare 500 tons of this kind of concrete?
14. The construction team compounded a kind of concrete with cement, yellow sand and stone in the ratio of 2:3:5. It is known that the cement is 7.2 tons less than stone. So, how many tons of materials are needed to prepare this kind of concrete?
15. The mix proportion of a concrete is cement: river sand: Gravel = 1:2.02:3.71 (mass ratio) and the water cement ratio is 0.57
16. What are the test procedures for maximum dry density and optimum moisture content
17. Relationship between dry density and moisture content
18. 8 maximum dry density of lime soil I want to know the maximum dry density and the best moisture content of 2:8 lime soil. I know this is to be done by compaction test, but the actual situation can not be done by compaction test. Find a general range
19. Is notoginseng lime soil proportioning by volume or by weight? For example, is notnotnotoginseng lime soil, notoginseng plain soil? Notoginseng lime soil, notoginseng plain soil
20. How to control the mix proportion of notoginseng lime soil