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A research team wants to measure the density of eggs with the following equipment: a thin wooden stick with uniform thickness and wax on its surface; One section is too small to be ignored.
(1) Eggs need salt to be suspended in salt water.

(2) Experimental steps:

1. Make a simple densimeter by winding fine iron wire around a small stick.

2. Put the simple densitometer into the water, the simple densitometer floats vertically in the water, and measure the depth h of the water immersed in the water with a scale.

3. Take out the simple densimeter, put the eggs in water, add salt, and keep stirring with the simple densimeter until the eggs are suspended in salt water.

4. Take out the eggs, then float the simple densimeter vertically in the salt water, and also measure the immersion depth of H 1.

Let the cross-sectional area of a simple densimeter be s,

The density of water is ρ water, and when the densimeter floats on the water surface, the depth of immersion in water is H water.

When the densimeter floats on the water surface, it is subjected to buoyancy: F floating water = ρ water gV drainage = ρ water gsh water,

The density of brine is ρ 1. When the densimeter floats on the surface of salt water, the depth of immersion in salt water is h 1.

When the densimeter floats on the surface of salt water, it is subjected to buoyancy: F floating 1=ρ 1gV row 1=ρ 1gsh 1,

In both cases, the densitometer floats on the liquid surface, and the buoyancy is equal to its gravity: f floating 1=F floating water =G,

∴ rho1gsh1= rho water GSH water,

∴ρ 1h 1=ρ water h water,

∴ Egg density: ρ egg =ρ 1=h water ρ water h 1

So the answer is: (1) What is needed is salt;

Step: 1. A simple densimeter can be made by winding fine wire around a small stick.

2. Put the simple densitometer into the water, the simple densitometer floats vertically in the water, and measure the length h of the water immersed in the water with a scale.

3. Take out the simple densimeter, put the eggs in water, add salt, and keep stirring with the simple densimeter until the eggs are suspended in salt water.

4. Take out the eggs, then float the simple densimeter vertically in the salt water, and also measure the immersion depth of H 1.

(2) Egg density: ρ egg =h water ρ water h 1.