When a 10 cm long cylinder is raised by 5 cm, its surface area increases by 31.4 cm As above! No equations

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• 1. The volume of a cylinder is 325cm and the bottom area is 25cm. What is the height of the cylinder
• 2. A cylindrical measuring cylinder with a bottom radius of 5cm. Take a conical iron block out of the measuring cylinder and the water surface drops 3cm. What is the volume of this iron block?
• 3. 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?
• 4. 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
• 5. 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
• 6. 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
• 7. 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
• 8. 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
• 9. 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
• 10. 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
• 11. Cut a cone with a bottom radius of 5cm and a height of 20cm into two cylinders of the same size, and the volume of the two small cylinders is less than that of the cylinder What's the difference between the sum of the surface area and the cylinder before the section?
• 12. The volume of a cylinder with a bottom radius of 5cm and a height of 10cm is______ cm3．
• 13. The surface area of a 50cm long cylinder is increased by 40cm after it is sawed into two identical small cylinders
• 14. I only give you a measuring cylinder with an appropriate amount of salt water. It's 80 ml. the mass of salt is 21.2 g and the volume of water is 70 ml. how to calculate the density of salt water
• 15. When measuring the density of salt water, they measured that the mass of salt water was 105g, the volume of salt water was 100ml, and the known density of salt was 2700kg / m3, Calculate the salt content t of this brine (the mass of salt in each cubic meter of brine)
• 16. Given the Avogadro constant and the molar mass and density of the gas, can we calculate the molar volume of the gas? Why?
• 17. After 58.5g NaCl is prepared into 1L solution, the corresponding concentration of NaCl is 1mol / L?
• 18. In order to prepare 1.00 l 1.00 mol / L NaCl solution, 58.5 g NaCl can be dissolved in 1.00 L water
• 19. The existing 4mol / L NaCl solution is 100ml, and the molar mass of sodium chloride is? Mass is?
• 20. Calculating molar volume with known molar mass density and constant