![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
Salt water with a density of 1.1x10 ^ 3kg / m3 is needed for seed selection. Now 500ml salt water is prepared, and its mass is 0.6kg. Is this salt water suitable for seed selection
The volume of brine v = 500ml = 500cm, the mass of brine M = 0.6kg = 600g,
The density of brine is ρ = m / v = 600 g / 500 cm, = 1.2 g / cm, = 1.2 × 10 m, kg / m, kg / m, kg / m, kg / m, kg / m, kg / m, kg / m, kg / m, kg / M, kg / m, kg / m, kg / m, kg / m, kg / m;
Such salt water does not meet the requirements
Salt water selection needs 1.1x10 ^ 3kg/m3 of salt water. Now 500ml salt water is prepared, and its mass is 0.6kg. Does this salt water meet the requirements?
The density of the prepared brine is ρ = m / v = 600 g ／ 500 cm ＆ 179; = 1.2 g / cm ＆ 179; = 1.2 × 10 ＆ 179; kg / M ＆ 179;
∵ 1.2 × 10 & # 179; kg / M & # 179; > 1.1 × 10 & # 179; kg / M & # 179;
Such salt water does not meet the requirements
It is reliable and easy for farmers to select seeds with salt water. The density of salt water is required to be 1.1 × 103kg / m3. Now 500ml salt water is prepared and its mass is 0.6kg. Does this salt water meet the requirements? If not, should salt or water be added? How much more?
The density of the sample: ρ sample = MV = 600g500cm3 = 1.2g/cm3, ∵ 1.2g/cm3 > 1.1 × 103kg / m3, ∵ does not meet the requirements, water should be added; set the amount of water to be added as Ag, because the density of water is 1g / cm3, so the volume of water to be added is acm3, so we can get from the meaning: 600g + ag500cm3 + acm3 = 1.1g/cm3, the solution, the value of a is 500, so 500g of water should be added The water does not meet the requirements; add water, add 500g
Required brine density: 1100kg / m3, now 0.5dm3 brine is configured, the mass is 0.6kg. Should add salt or water? How much?
Since the mass of 0.5dm3 brine is 0.6kg, the density of brine ρ = m / v = 0.6/0.5kg/dm3 = 1.2 * 10 ^ 3kg / m3 is greater than the required density of 1.1 * 10 ^ 3kg / m3, so water should be added
Suppose: the volume of water is xdm3 with XKG water
（0.6+x）/(0.5+x)=1.1
The solution is: x = 0.5
Therefore, 0.5kg of water should be added
RELATED INFORMATIONS
- 1. Salt water with a density of 1.1 × 10 & sup 3; kg / M & sup 3; is needed for salt water seed selection
- 2. The density of aluminum is 2.7/10 kg / m, which means that the physical meaning is to cut off half of the aluminum, and the remaining half of the density is 0 1: The density of aluminum is 2.7/10 kg / m, which means that the physical meaning is to cut off half of the aluminum, and the remaining half of the density is 0 2. Comparing iron and copper blocks with the same mass, we can see that the volume of iron and copper blocks with the same volume is larger 3. The density of oxygen is 1.43 and the density of return water is 1.03/10
- 3. The density of aluminum is 2.7 kg / M & sup3;, which means the physical meaning of
- 4. When a solid ball with a density of 0.9 × 103kg / m3 is put into water and alcohol successively, the ratio of the volume of water discharged from the ball to the volume of alcohol discharged from the ball is________ What is the buoyancy ratio of the ball in water and alcohol______ (ρ = 0.8 × l03kg / m3) There are some on Baidu, but I can't understand them,
- 5. The mass of a metal block is 386g and the volume is 20cm3. What is the density of this metal block kg / m3? Tonight's homework is due tomorrow~ Format: according to the known, ask, answer to write
- 6. When two solid metal blocks of density ρ A and ρ B are all immersed in water for weighing, the indication of the spring dynamometer is the same A. When ρ A is less than ρ B, they may have the same gravity in the air. B. when ρ A is greater than ρ B, they may have the same gravity in the air. C. when ρ A is less than ρ B, they may have the same gravity in the air. D. when ρ A is greater than ρ B, they may have the same gravity in the air
- 7. A solid metal block with density of ρ is hung on the hook of the spring scale. When it is weighed in air, the indication number of the spring scale is F1. When half of the volume of the metal block is immersed in the air, the spring scale will display the number of F1 If the indication of the spring scale is F2, then when the metal block is completely immersed in the liquid, the indication of the spring scale is, what is the density of the liquid?
- 8. A cylinder, its bottom radius is 3cm, its height is 5cm, what is its surface area? What is its volume?
- 9. Pour water from a cold water with a bottom radius of 10 cm into an empty glass with a bottom radius of 5 cm and a height of 8 cm. When the glass is full, the water surface of the cold water cup will drop
- 10. A cuboid is obtained by heightening a cuboid by 2cm (the bottom remains unchanged), and the surface area of the cuboid is 40cm larger than that of the original cuboid;,
- 11. [physical density of the second day of junior high school] when selecting seeds with salt water, the density of salt water should be higher
- 12. The experiment of measuring the density of brine Here is a scale, a cuboid block, water and beaker. Please design an experiment to measure the density of brine
- 13. The surface area of a 2-meter-long log increases by 48CM after it is cut into three sections. The original volume of the log is () cm
- 14. When a is put into alcohol (ρ = 0.8 × 103kg / m3) and B is put into water at rest, the ratio of buoyancy is 3:2, then the density of B is () A. 0.6×103kg/m3B. 0.8×103kg/m3C. 1.2×103kg/m3D. 1.5×103kg/m3
- 15. The buoyancy of a wood block with a mass of 1kg and a density of 0.4 × 103kg / m3 is () A. 1kgB. 5kgC. 9.8ND. 24.5N
- 16. A piece of ice with a volume of 0.1m3 floats on the water surface (ρ ice = 0.9 × 103kg). How to calculate the buoyancy of the ice A piece of ice with a volume of 0.1m3 floats on the water surface (ρ ice = 0.9 × 103kg) to calculate the buoyancy of the ice. Why is the buoyancy of ice calculated by its density rather than the density of water
- 17. A hydrogen balloon, with a volume of 5000m3 and a weight of 15000n, is known to have a density of 0.09kg/m3 for hydrogen and 1.29kg/m3 for air
- 18. There is some water in the cylindrical container. The bottom radius of the container is 5cm, the height is 20cm, and the water depth is 10cm. Now, a cylindrical iron bar with the bottom radius of 3cm and the height of 25cm is vertically inserted into the container to make the bottom of the iron bar contact with the bottom of the container. At this time, the water depth is lower______ Cm
- 19. The inner bottom radius of a cylindrical container containing water is 5cm, 20cm deep and 15cm deep. The iron cylinder with bottom radius of 2cm and height of 17cm is vertically placed on the container The depth of water in the container is several cm
- 20. The height HCM of a certain volume of water in the cylinder is inversely proportional to the square of the cross-sectional area of the cylinder To find the functional relationship between H and s (2) When 1cm cubic water is dropped into the measuring cylinder with 1cm square and 5cm square cross-sectional area, what is the height of liquid level in the measuring cylinder (3) From (2), which of several measuring cylinders with the same volume of water but different cross-sectional area is more convenient for reading?