A bottle with a volume of 3 times 10 to the negative fourth cubic meter contains 0.2 kg of water. A thirsty crow will take a cube with a density of 2.5 times 10 each time Kilogram per cubic meter of pebbles into the bottle, when the crow put 25 pieces of the same pebbles, the water rose to the bottle Q 1. What is the mass of a small stone? 2. If all the pebbles are dissolved in water and mixed with water to form a liquid with uniform mass distribution, what is the density of this liquid? Wait online, please..

A bottle with a volume of 3 times 10 to the negative fourth cubic meter contains 0.2 kg of water. A thirsty crow will take a cube with a density of 2.5 times 10 each time Kilogram per cubic meter of pebbles into the bottle, when the crow put 25 pieces of the same pebbles, the water rose to the bottle Q 1. What is the mass of a small stone? 2. If all the pebbles are dissolved in water and mixed with water to form a liquid with uniform mass distribution, what is the density of this liquid? Wait online, please..

The density of water is 1000 kg / m3
The volume of 0.2kg water: 0.2/1000 = 2 * 10 ^ - 4) (cubic meter) the negative fourth cubic meter of 2 times 10
Total volume of added stones: 3 * 10 ^ - 4-2 * 10 ^ - 4 = 10 ^ - 4
Total mass: 2.5 * 10 ^ 3 * 10 ^ - 4 = 0.25 (kg)
Mass of each stone: 0.25/25 = 0.01 (kg) = 10 (g)
Total mass of mixed liquid: 0.2 + 0.25 = 0.45 (kg)
Density: 0.45 / (3 * 10 ^ - 4) = 0.15 * 10 ^ 4 = 1.5 * 10 ^ 3 (kg / m3)

A bottle with a volume of 3 × 10 and a power of minus 4 m ^ 3 contains 0.2kg of water. A thirsty crow puts a pebble with a mass of 0.01kg into the bottle each time. When the crow throws 25 identical pebbles, the water surface rises to the top of the bottle
(1) Total volume of stones in the bottle
(2) Density of stone

1. The volume of water is the negative fourth power of 2 * 10
The negative fourth power of 2 * 10 is equal to the negative fourth power of 10, so the volume of stone in the bottle is the negative fourth power of 10
2. The mass of stone is 0.01 * 25, equal to 0.25
Using the density formula P = m / V
The negative fourth power of P = 0.25/10 = the third power of 2.5 * 10