Cube of a tree How to calculate the number of cubic meters of trees cut down?

Immerse in water, see displacement, do not know volume

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1. How many bricks per cubic meter are 60 cm long, 12 cm wide and 24 cm high?
2. The volume of a substance with a mass of 1kg and a density of 4 × 10 cubic kg / M & sup3; can be calculated
3. The volume of an airship is 150 × 104m3, the carrying capacity is 9 × 106n, and the air density is 1.29kg/m3. How much buoyancy does it bear in the air? How much weight does it weigh (g = 10N / kg)?
4. The volume of an airship is 2000m ~ 3, and its deadweight is 4900n. What is its maximum deadweight when it is launched? (air density = 1.29Kg / m3) (process)
5. The volume of an airship is 2000m and its deadweight is 4900n. When it is launched, what is its maximum load?
6. The volume of buoyancy airship is 2000m cubic meters, the weight is 4900n, and the air density is 1.2 Grade 8 Volume 1 Science Chapter 1 buoyancy help The volume of the airship is 2000m cubic meters, the dead weight is 4900n, and the air density is 1.29kg/cubic meter. How much buoyancy does the airship suffer in the air?
7. (1 / 2) the volume of the airship filled with hydrogen staying in the air is 3 * 10 cubic meters, the density of air is 1.29kg/cubic meter, and the density of hydrogen is 0 (1 / 2) the volume of the airship filled with hydrogen staying in the air is 3 * 10 cubic meters, the density of air is 1.29kg/cubic meter, the density of hydrogen is 0.09kg/cubic meter, and the weight of the airship is 1.29kg/cubic meter
8. The density of water is 1 times 10 to the third power kg / m3
9. Physical density: the density of water is 1.0 × 10 & # 179; kg / M & # 179;, meaning
10. The density of water is 1.0 * 10 cubic kilogram / meter cubic meter, which means
11. How to calculate the cube of a tree? We have a tree to sell. It is 2.5 meters long and 44 cm in diameter. How many square meters are there? The price of a cubic meter is 1500 yuan. How much can my tree sell?
12. How many cubic meters does a tree with a length of 2.5 meters and a diameter of 70 cm have
13. A tree, 5 meters long, 6 cm in diameter, cube Cube = length * radius * 3. What has two 0.3
14. How many pieces can a cubic tree be cut into 80 cm, 0.15-thick thin plates? Cut into pieces 80 cm long and 0.15 cm thick, how many pieces can be produced
15. Iron pipe weight calculation formula diameter 60 cm wall thickness 2 cm 1 m
16. A board 120 cm in length and 60 cm in width needs to be cut into 40 cm in length and 40 cm in width. What's the yield? How to calculate the formula
17. How to calculate the area of a circular cylinder with a diameter of 60 cm and a diameter of 40 cm and a height of 15 cm
18. How many centimeters is 60 centimeters How many centimeters is one centimeter?
19. How many cubic meters is 12 meters long, 10 meters wide and 15 meters high
20. A 4-meter-long cylindrical timber is cut into two equal sections, and the surface area increases by 4.8 square decimeters. What is the original volume of the log