When two solid metal blocks of density ρ A and ρ B are all immersed in water for weighing, the indication of the spring dynamometer is the same A. When ρ A is less than ρ B, they may have the same gravity in the air. B. when ρ A is greater than ρ B, they may have the same gravity in the air. C. when ρ A is less than ρ B, they may have the same gravity in the air. D. when ρ A is greater than ρ B, they may have the same gravity in the air

When two solid metal blocks of density ρ A and ρ B are all immersed in water for weighing, the indication of the spring dynamometer is the same A. When ρ A is less than ρ B, they may have the same gravity in the air. B. when ρ A is greater than ρ B, they may have the same gravity in the air. C. when ρ A is less than ρ B, they may have the same gravity in the air. D. when ρ A is greater than ρ B, they may have the same gravity in the air

Hang a metal block under the spring scale, and the indication of the spring scale is 2.2n
When it is immersed in 0.8 * 10 3 times of kg / M cubic alcohol, the reading of the spring scale is 1.6n, then the volume of the metal block is? When it is completely immersed in water, the reading of the spring scale is?
It's a process

1. After immersion in alcohol, the decrease of the reading of the spring scale is equal to the buoyancy produced by alcohol, so the buoyancy f = 2.2n-1.6n = 0.6N
2. Let the volume of the object be 2V
F = ρ liquid * g * V
Therefore, v = f / (ρ liquid * g) = 0.6 / (cubic kg / m * 10 of 0.8 * 10) = 0.000075m3 (75cm3)
So the volume of this object is 150 cubic centimeters
3. Completely submerged in water,
Buoyancy F1 = 1 * 10 to the third power kg / m * 10 * 0.000075m3 * 2 = 1.5n
At this time, the reading of spring scale = 2.2-1.5 = 0.7n

The density of an alloy block a is 6.6 * 103kg / cm3, and that of a brick B is 2.2 * 103kg / cm3. Their masses are equal
If it is suspended and immersed in water, the buoyancy ratio of a and B is equal to the number ratio of a and B springs

Because the density of a and B is larger than that of water, the reading of spring is positive when it is suspended in water. The density ratio of a and B is 3:1 and the volume ratio is 1:3, so the buoyancy ratio is 1:3. Because the mass is equal and the volume ratio is 1:3, the reading ratio of spring is: (6.6-1) x103x15.5 5 5 -------- = --