What is the meaning of the density of 9.8 × 10.0 cubic meters of copper?

The mass of copper is 8.9 × 10 cubic kilogram

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1. It is known that the density of the object is 0.6 * 10 cubic kilogram per cubic meter, and the density of copper is 7.9 * 10 cubic kilogram per cubic meter. Then the object and copper are tied together and immersed in water. It is found that they are suspended in water
2. How many cubic meters of soil can be excavated from a swimming pool 40 meters long, 20 meters wide and 2.5 meters deep? If each cubic meter of soil weighs 0.7T, how many times does it need to be transported by a 3.5t truck?
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4. How many tons is a cubic meter?
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7. How many tons of concrete are there on one side
8. Theoretical weight per square meter of 12mm thick steel plate
9. What is the weight of a cubic meter of water? How much is the weight of a cubic meter of concrete?
10. When the water cement ratio is 0.5:1, what is the weight of cement in each cubic meter of cement slurry? How to calculate?
11. Sand density
12. The density of oxygen in a steel cylinder is 8 kg / m3, one fourth of which is used. What is the remaining oxygen density in the cylinder?
13. According to this ratio, C25 concrete mix proportion (weight ratio): cement: Sand: Gravel: water = 1:1.48:3.63:0.44; cement 420 yuan per ton, sand 105 yuan per cubic meter, stone 75 yuan per cubic meter, water 1.5 yuan per cubic meter; how much does it cost to find a cubic meter of sand and stone?
14. What is the ratio of C20 concrete?
15. The following figure shows the fraction of material used to make a concrete 1. What is the ratio of the materials used in this kind of concrete? 2. How many tons of each of the three materials are needed to prepare 180 tons of this kind of concrete? 3. If there are 50 tons of underground materials, how many tons of cement are left when all the yellow sand is used up? How many tons of stones will be added?
16. How many kilos of gravel per cubic meter?
17. How many kilos does a cubic stone weigh? How many kilos does a cubic sand weigh
18. How much does a cubic sand weigh
19. How much does the mangrove weigh per cubic meter?
20. Dividing by a nonzero number is equal to multiplying by the reciprocal of the number______ (judge right or wrong)