Given the density of iron, the weight and thickness of the object; how to calculate the surface area? What is the formula?

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• 1. How to calculate the weight of the lamp pole? The formula is: the density of iron is 7.85 For example, the height of the pole is 11m, the diameter of the big end is 175mm, the diameter of the small end is 80mm, and the lateness of the iron is 4mm,
• 2. Formula for calculating the weight of iron For example, a piece of iron is m 12x80, how much should its weight be? How to calculate the calculation formula? M 12x80 mm. How many kilos do I need to get the result. What's the density. How do you know?
• 3. Fifth grade math oral problem fast! The fifth grade's mental arithmetic needs answers
• 4. Score oral problem, urgent! The second half of the fifth grade
• 5. Oral arithmetic (score) An offer score that can be reduced 1 / 12 × 6 = 2 / 33 × 11= 4 / 5 × 5 / 8 = 1 / 3 + 3 / 5= 4 / 9 × 2 = 3 / 24 × 8= 20 / 21 × 14 / 15= 1 / 3 × 2 / 5 = 2 / 3 × 2 / 3= 5 out of 17 × 0 = 6 out of 1 × 7= 9 of 14 × 7 of 6 = 8 of 9 × 5 of 12= 5 / 6 × 3 / 4 = 2 / 3-1 / 2=
• 6. Some scores have more oral problems
• 7. A park office building has three floors, 2800 in height, 2700 in stairwell, 5400 in depth and 240 in wall thickness, Width b, ladder length 1, floor well width b, platform width D1, D2
• 8. Room 2.3 meters, depth 4 meters, can do staircase? Seek design! Seek the design drawing of stairwell. The height of the building is 3 meters, including the floor
• 9. The height of the residence is 3 meters, the depth of the staircase is 4.5 meters, the opening is 2.6 meters, and the indoor and outdoor height difference is 450 mm. A parallel double running staircase is designed Such as the title
• 10. In the design of multi-storey residential stairs, the size of stairwell is 2.7m, the depth is 4.8m, the floor height is 2.8m, and the height difference between inside and outside is 0.6m. The floor plan of the building is designed
• 11. The relationship between atmospheric pressure and density?
• 12. The relationship between temperature, pressure, density and volume of gas?
• 13. Does the influence of density have anything to do with mass, volume, temperature, state of matter and pressure
• 14. In physics, the relationship between density, mass, volume, and pressure
• 15. Molar ratio to find mass ratio The molar ratio of water and acetic acid is 5.8:1.0 The molar ratio of calcium to magnesium is 1.4:1.0
• 16. How to convert atomic ratio and molar ratio? For example, in a compound, the molar ratio of Mg to CA is 1:100, so what is the atomic ratio of these two elements?
• 17. Molar ratio and mass ratio The molar ratio of nitric acid to cyclohexanol is 1.28 to 1, the molecular weight is 63 and 100, so the mass ratio is 80 to 100 Is this 80:100 in the same ml case? 400ml nitric acid is 600g, 400ml cyclohexanol is 400g, which seems different from 80:100. For example, in the experiment, 400ml nitric acid, 800ml cyclohexanol is 1.28:1, 400ml nitric acid is 600g, 800ml cyclohexanol is 800g, and the mass ratio is 80:100 That is, when the nitric acid is 600g, the cyclohexanol is 750g. Should the 750g be 40ml or 80ml?
• 18. How does mass translate into mole ratio?
• 19. How to convert the molar ratio and the weight ratio? For example, the molecular weight of a is 52.02, the molecular weight of B is 102.02, and the mass ratio of a and B is 0.425? How to convert the molar ratio and weight ratio: for example, the molecular weight of substance A is 52.02, the molecular weight of substance B is 102.02, and the molar ratio of substance A to substance B is 0.425?
• 20. To infer, it is similar to 1m / S = 3.6km/h