1. A copper ball with a mass of 178 grams and a volume of 30 cubic centimeters is solid or hollow. What is the hollow volume? If the hollow part is filled with aluminum, what is the total mass? 2. In order to reduce the weight of the aircraft, an engineer changed a steel part into an aluminum part to reduce its mass by 1.56 kg. What is the mass of aluminum required? The density of steel is 7.9 × 10 cubic kg / cubic cm, and the density of aluminum is 2.7 × 10 cubic kg / cubic cm

1. P copper ball = m / v = 178g / 30cm3 = 5.9g/cm3 5.9g/cm3 ＜ 8.9g/cm3 hollow
First calculate the volume of copper in the copper ball, v = m / P = 178g / 8.9g/cm3 = 20cm3
Hollow volume = V aluminum = 30cm3-20cm3 = 10cm3
M = PV = 10cm3 * 2.7g/cm3 = 27g m total = 27g + 178g = 205g
2. Mass reduced by 1.56kg
Equivalency relation P iron V-P aluminum v = 1.56 (making the same part V is equal ~ this is the implied condition)
V=0.0003
M al = PV = 2700 * 0.0003 = 0.81

RELATED INFORMATIONS

1. A hollow copper ball with a volume of 30 cubic centimeters and a mass of 178 grams is used to calculate the volume of the hollow part of the copper ball
2. A hollow copper ball with a volume of 30 cubic centimeters and a mass of 178 grams. If the hollow part of the ball is filled with aluminum, what is the mass of the ball? The density of aluminum is equal to 2.7 times 10 cubic kilogram per cubic meter, and the density of copper is equal to 8.9 times 10 cubic kilogram per cubic meter
3. A bottle contains 500 CM & sup3;, 1.2 × 10 & sup3;, kg / M & sup3;, how much more water should be added to dilute the brine to 1.1 × 10 & sup3;, kg / M & sup3?
4. The density of salt water is 1.1 * 10 ^ 3kg / m3 when selecting seeds with salt water. Now, 0.5 cubic decimeter salt water is prepared, and its mass is 0.6kg. Does this salt water meet the requirements? (if it does not meet the requirements, should salt or water be added? How much to add?) 1.1×103kg/m³
5. They collected 1000ml salt water and weighed it to be 1.05kg. The density of salt water was 2700kg / m2
6. If you want to prepare 1000 ml, density of 1.1 * 10 ^ 3 kg / m ^ 3, mass fraction of 0.1 brine solution, how many kg of water and salt do you need
7. If you want to prepare 1000 ml brine solution with a density of 1100 kg / m3 and a mass fraction of 10%, how many kg of water and salt do you need?
8. If you want to prepare 1000ml salt water solution with density of 1.1 * 10 ^ 3kg / m ^ 3 and mass fraction of 10%, how many kg of water and salt are needed
9. Dilute the concentrated sulfuric acid with density of 1.84 g / cm3 and mass fraction of 98% to dilute sulfuric acid with density of 1.20 g / cm3 and mass concentration of 2 mol / L. calculate: (1) the volume of concentrated sulfuric acid required; (2) the volume of water required
10. The concentrated sulfuric acid with density of 1.84 g / cm3 and 98% mass fraction was diluted into 100 ml. the mass concentration of the substance was 2 mol / L and the density was 1.20 g / cm3 Find the volume of sulfuric acid needed, the volume of water needed?
11. The volume of the hollow copper ball is 30cm3, the mass m = 178g. After the hollow part is filled with some liquid, the total mass m = 314g? (ρ Cu = 8.9 × 103 kg / m3)
12. The volume of the hollow copper ball is 30cm3, the mass m = 178g. After the hollow part is filled with some liquid, the total mass m = 314g? (ρ Cu = 8.9 × 103 kg / m3)
13. The volume is 30 cm3 and the mass is 178 g. if the hollow part is filled with aluminum, what is the mass of aluminum? Density of copper P = 8900 kg / m3, density of aluminum P = 2700 kg / m3 Clear calculation process
14. If the hollow part of a hollow copper ball with a volume of 30 cm3 and a mass of 178 G is filled with aluminum, what is the total mass of the ball filled with aluminum? (known: the density of aluminum is 2.7 × 103kg / m3, the density of copper is 8.9 × 103kg / m3)
15. A copper ball contains 178g of copper. If the total volume of the ball is 40 cubic centimeters, what is the hollow volume of the ball To process, urgent!
16. A hollow copper ball has a mass of 178g and a volume of 50 cubic centimeters. What is the volume of the hollow part of the ball,
17. The mass of the hollow copper ball with a volume of 30 cm3 is 178 g. when the hollow part of the ball is filled with some liquid, the total mass of the ball is 314 g. what is the density of the injected liquid? (ρ Cu = 8.9g/cm3)
18. One cubic meter cube can be divided into several 1 cubic decimeter cubes. If these cubes are arranged in a row, how many meters are they in total?
19. Cut 1 cubic meter cube block into 1 cubic decimeter cube block. If these blocks are arranged in a row, they are () long A. 1km B. 100m C. 100m D. 1000M
20. A cubic meter cube can be cut into () 1 cubic decimeter cubes. If you line them up, they are () meters long