![](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>)
The length, width and thickness of a brick are 20cm, 10cm and 5cm respectively, and the mass is 2kg. When the brick is placed on the horizontal ground in different ways, what are the maximum and minimum pressures of the brick on the horizontal ground? (take g = 10N / kg)
F = g = mg = 2kg × 10N / kg = 20n, when the brick is placed vertically, the maximum pressure is PDA = FS1 = 20n10 × 5 × 10 − 4m2 = 4 × 103pa; when the brick is placed horizontally, the minimum pressure is PDA = fs2 = 20n20 × 10 × 10 − 4m2 = 1 × 103pa
Density calculation, solution (1) there is a rectangular brick, side length is 10cm and 20cm and thickness is 5cm, if the brick density is 2.5
(1) There is a rectangular brick with side length of 10cm and 20cm and thickness of 5cm. If the density of the brick is 2.5 × 10 ^ 3kg / m ^ 3, what is the mass of the brick?
(2) A bottle can hold 1kg of water, ask: (1) what is the volumetric formula of the bottle? (2) how many kg kerosene can be held with the bottle? (the density of kerosene is 0.8 × 10 ^ 3kg / m ^ 3)
(3) The mass of a piece of glass is 0.3KG, the total mass when it is filled with water is 0.8kg, and the total mass when it is filled with another liquid is 0.7kg?
(4) There are two bottles with equal volume and mass equal to 0.5kg, each filled with water and certain liquid. The total mass of water is 4.5kg, and the total mass of certain liquid is 3.7kg. Q: (1) what is the volume of the bottle? (2) what is the density of the liquid?
(5) After a cubic meter of ice is completely dissolved into water, find out (1) what is the mass of water? (2) what is the volume of water? (the density of ice is 0.9 × 10 ^ 3kg / m ^ 3)
(6) The mass of a copper ball is 890g and the volume is 130cm ^ 3
(1) Is the copper ball hollow or solid?
(2) If it is hollow, what is the volume of the hollow part? (density copper = 8.9 × 10 ^ 3kg / m ^ 3)
(1) Volume 10 * 20 * 5 * 0.001 = 1m ^ 3 mass 1 * 2.5 * 10 ^ 3 = 2500kg (2) density of water ρ = 1.0 × 10 ^ 3 kg / m ^ 3 volumetric formula v = 1 / ρ = 0.001M ^ 3 can hold kerosene M = 0.001 * 0.8 × 10 ^ 3 = 0.8kg (3) mass of water filled with water M = 0.8-0.3 = 0.5kg volumetric formula v = m / ρ = 0.5 / (1.0
A brick is 20cm long, 10cm wide and 5cm thick. When the brick is placed on the horizontal ground, what is the minimum pressure of the brick on the ground
The density of brick is 2.4 * 10 ^ 3kg / m ^ 3
P=F/S
So the gravity of F = g brick is certain, so the larger s is, the smaller P is
The maximum s is 20 * 10 = 200 square centimeter = 0.02 square meter
I won't write the formula, g = mg = density, VG = 2.4 * 10 ^ 3kg / m ^ 3 * 20 * 10 * 5 * 10 to the power of - 6 * 9.8n/kg to get g, divide G by 0.02 square meter
RELATED INFORMATIONS
- 1. There is a long, wide, high 20cm, 10cm, 5cm rectangular wood block. When it is placed horizontally, vertically, and laterally, the ratio of its pressure on the desktop () and the ratio of its pressure ()
- 2. A cube solid iron block with a mass of 7.9kg is placed in the center of a horizontal tabletop with an area of 0.5m2. What is the pressure of the iron block on the tabletop? (the density of the iron is 7.9 × 10 & # 179; kg / M & # 179;, g = 10N / kg)
- 3. Solid cube wood block with side length of 10cm, density of 0.6 × 10 ｛ kg / m ｛ 179;; is still in a container with enough water, and its upper and lower bottom surfaces are smooth Parallel to the water surface, (the wood block is not completely immersed in water) calculation: 2. The buoyancy of the wood block in the water 3. The volume of the wood block immersed in the water 4. The pressure of water on the ground under the wood block. (g = 10N / kg)
- 4. If the mass of a cube with a side length of 10 cm is 0.6 kg, what is the density of the cube;
- 5. The three squares have the same pressure on the ground, and the density is P1, P2, P3. P1 is greater than P2, and P3 is greater than P3
- 6. The density relation of three solid cubes is ρ 1 Find the relationship between these three forces
- 7. The density of a is higher than that of B. the pressure of these two cubes on the horizontal ground is as follows A. P a = P B B. P a > P B C. P a < P B D. All of the above are possible
- 8. The two solid cubes have the same pressure on the horizontal plane, and the relationship between their density is The two solid cubes have the same pressure on the horizontal plane, and the relationship between their density is P1 > P2 (the letter of density will not be printed, instead of P). If the pressure of the two cubes on the horizontal ground is F1 and F2 respectively, then F1 is the same_________ F2 (greater than, less than, equal to) Why?
- 9. The weight of an elephant is 6000kg, and the landing area of each foot is 600cm2. Try to calculate the pressure of the elephant on the ground when standing. (G is 10N / kg)
- 10. The cylinder with the height of 10 cm is erected on the horizontal table. The pressure of copper block on the table is calculated (P (copper) = 8.9 × 10 cubic kg / M cubic)
- 11. As shown in the figure, a beaker with a bottom area of 100cm & sup2; was originally filled with 8.5cm deep water, and a beaker with a mass of 55g and an average density of 1.1 × 10 & sup3; kg / m The buoyancy of an egg immersed in water 2. The pressure of water on the bottom of the container after putting in the eggs. (G is 10N / kg) thank
- 12. A rectangular iron block with a length of 10 cm, a width of 8 cm and a height of 5 cm is melted and cast into a cylindrical iron block with a diameter of 20 cm, and the height of the cylindrical iron block is calculated
- 13. The density ratio of a and B is 2:1 and the side length ratio is 1:2. Place a in the center of B and place B on the horizontal table Find the ratio of the pressure of a to B and the pressure of B to the ground
- 14. When the cube A and cube B are placed on the horizontal table, their pressure on the table is equal, and the ratio of pressure is 9:4, then the ratio of density of cube A and cube B is () A. 2：3B. 3：2C. 1：1D. 4：9
- 15. If the cube A and cube B are placed on the horizontal table, their pressure on the table is equal, and the ratio of pressure is 9:4, then the ratio of density of cube A and cube B is 0 In order to prepare a certain mass fraction of dilute sulfuric acid, when measuring the concentrated sulfuric acid with the dosage cylinder, look down on the scale, and when measuring the water, look up on the scale, why is the mass fraction smaller than the requirement?
- 16. Two metal cylinders stand on the horizontal table, the ratio of their bottom area is 8:9, the ratio of their density is 9:8, and the ratio of the pressure on the table is 3:2. Then the ratio of the height of the two metal cylinders is 8:9______ ．
- 17. The density of physical iron is 7900kg / m3, the mass of an iron ball is 79g, and the volume is 15cc. What is the volume and density of the iron ball?
- 18. In order to judge whether an iron ball is hollow or not, the density of iron is 7.9g/cm3, the mass of iron ball is 79, and the volume of water is 60.0 The total volume of water and iron balls is 75.0 1. Is the ball hollow or solid 2. If the ball is hollow, what is the volume of the hollow part
- 19. How much buoyancy does 11.7kg iron block get when it is immersed in water? (iron density 7.8G / cm3) aluminum block gets buoyancy 2.94n when it is immersed in water, and the mass of aluminum block is 1. What is the mass of the aluminum block when immersed in water? (aluminum block density: 2.7g / cm3) 2. What is the buoyancy when half of the 120cm3 stone is immersed in alcohol? (alcohol density: 0.8g / cm3) 3. What is the volume of the stone when immersed in alcohol is 0.392n? 4. The buoyancy when a stone is immersed in water is 3.92n, How much buoyancy do you get when you immerse it in alcohol? 5. A stone weighs 29.4n, and when you immerse it in water, it weighs 19.6n?
- 20. What is the buoyancy of a 79g iron when it is put into water? (the known density of iron is 7.9 * 10 ^ 3kg / m ^ 3)