A hollow copper ball with a mass of 178g and a volume of 30cm3, (1) The ratio of the volume of the hollow part to the volume of the solid part of the copper ball was calculated. (2) Xiao Hua filled the hollow part of the copper ball with some liquid, and the total mass was 314g

A hollow copper ball with a mass of 178g and a volume of 30cm3, (1) The ratio of the volume of the hollow part to the volume of the solid part of the copper ball was calculated. (2) Xiao Hua filled the hollow part of the copper ball with some liquid, and the total mass was 314g

The density of copper is 8.9g/cm3
1）
The volume of copper V1 = 178 / 8.9 = 20 cm ^ 3
Volume of hollow part V2 = 30 - 20 = 10 cm ^ 3
The volume ratio of the hollow part to the solid part of the copper ball is 1:2
2）
Mass of injected liquid M = 314 - 178 = 136 G
The density of the injected liquid is ρ = 136 / 10 = 13.6 g / cm ^ 3
It's mercury~

A copper ball with a mass of 178g and a volume of 30cm3 is solid or hollow? What is the hollow volume? If the hollow part is filled with aluminum, what is the total mass?
2. There is a glass bottle with a mass of 0.1kg. When the bottle is filled with water, the total mass of the bottle and water is 0.4KG. Use this bottle for another liquid. The total mass of the bottle and liquid is 0.64kg. Calculate the density of this liquid

Junior high school students
178 / 8.9 = 20cm3 theoretical volume
30-20 = 10 hollow part
10 * 2.7 = 27 weight of aluminum
178 + 27 = 205 total mass
0.4-0.1=0.3
0.3kg/1=300cm3
(0.64-0.1)kg/300=1.8g/cm3
Although the answer how to feel a little strange, in the eyes of junior high school students should also be a very simple question ah

Is the copper ball with volume of 30cm & sup3; and mass of 178g solid or hollow? If it is hollow, what is the mass of aluminum if the hollow part is filled with aluminum?

It's hollow
From ρ = m / V
ρ = 178g / 30cm & sup3; = = 5.93 * 10 ^ 3kg / M & sup3;
The density of Cu is ρ Cu = 8.9 × 10 ^ 3 kg / M & sup 3;
ρ