A hot-air balloon with a mass of 0.3 tons rises at a constant speed in the air. The resistance level is 1 / 10 of the weight of the balloon. What is the buoyancy of the balloon?

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• 1. What is the mass of 1 cm3 ice after melting into water? What is the volume of cm3? (ρ water = 1g / cm3, ρ ice = 0.9g/cm3)
• 2. How many kilogram is a piece of ice with a volume of 5 cubic meters turned into water? How many cubic meters is the volume of water?
• 3. When water becomes ice, its volume increases by 10%?
• 4. What is the density of ice? What is the mass and volume of 1 cubic meter of ice after melting into water?
• 5. 0.9kg ice melts into water, and the volume is reduced by 0.1m3 0.9kg ice melts into water, which reduces the volume by 0.1m3 ...
• 6. The density of ice is 0.9 × 103kg / m3. When a piece of ice with a volume of 100 & nbsp; cm3 melts into water, the mass of ice is 0.9 × 103kg / m3______ g. The volume is______ When cm3.135 & nbsp; g water forms ice, its mass is______ Kg, the volume is______ cm3．
• 7. A wood block with density of 600kg / m3, volume of 2 cubic decimeters, floating on the water surface, G to 10N / kg, how much is the volume of water discharged by the wood block?
• 8. Cement dosage: 5%, maximum dry density: 2.3g/cm3, optimum water content: 6%, try to calculate the mass mix proportion?
• 9. For the process, ordinary portland cement with density of 3.1 g / cm3, crushed stone with apparent density of 2.68 g / cm3 and medium sand with apparent density of 2.70 g / cm3 are used The concrete prepared in the laboratory is ordinary portland cement with density of 3.1 g / cm3, crushed stone with apparent density of 2.68 g / cm3 and medium sand with apparent density of 2.70 g / cm3. It is known that the water consumption of one cubic meter of concrete is 190 kg, the water cement ratio is 0.50, and the sand ratio is 33%?
• 10. The average density of alcohol with 20% water content is? (alcohol density: 0.8g / cm3)
• 11. A hot-air balloon is still in the air. It is known that the total mass of the balloon and the object is 100 kg. What is the buoyancy at this time______ Cattle
• 12. At present, a 100 cubic meter hot air balloon is still in the air. If the known air density is 1.29 kg / cubic meter, then the hot air balloon is still in the air
• 13. At present, a hot air balloon has a volume of 120m3. If the known air density is 1.29kg/m3, what is the buoyancy when it is still in the air A solid object with a volume of 10 negative quartic M & # 179; weighs 2.8n. If the object is completely immersed in a certain liquid, the apparent number of the spring dynamometer is 1.8n, then what is the density of the liquid?
• 14. There is a 100 square meter hot air balloon, still in the air, with air density of 1.29 kg / m3 and buoyancy of a.12
• 15. If the density of sea water is 1.1 × 103kg / m3 and the density of ice is 0.9 × 103kg / m3, what is the volume of the iceberg exposed to the sea?
• 16. The volume of the upper and lower parts of the iceberg is V1 and V2 respectively. The known density of sea water is 1.03 × 10 cubic kilogram per cubic meter, and the density of water is 0.9 × 10 cubic kilogram per cubic meter. Try to calculate the percentage of the volume of the iceberg below the water surface in the total volume
• 17. If the mass ratio of a and B is 3:5 and the volume ratio is 1:2, then the density ratio of a and B is 0______ If their masses are equal, then the ratio of their volumes is______ ．
• 18. If there are two metal blocks a and B, the density of a is 2 / 3 of that of B, and the mass of B is twice that of a, then the volume of a is the same as that of B___ ?
• 19. There is a piece of metal with a mass of 81g and a volume of 30cm3. Find out the density of the metal and what substance it may be
• 20. If the mass ratio of two pieces of metal is 3:2 and the volume ratio is 2:1, then the density ratio is 3:2