Measure the density of an eraser, the density of the eraser and the density of water

1) Required materials: balance, graduated cylinder, fine line, sufficient amount of water (2) Experimental methods and steps: 1 Weigh the measured mass of plasticine m2 with a balance Pour an appropriate amount of water into the graduated cylinder and measure its volume v1 3 Tie the plasticine with a thin wire and slowly put it into the graduated cylinder weighing water After it is fully submerged, write down the number of the measuring cylinder at this time v2 (3) According to the letters used in the experimental procedure, the density of the plasticine is expressed:

m/v2-v1

1) Balances, pipettes, beakers.

2）1.Use a balance to weigh the plasticine mass m.

2.Fill the beaker with water (marked with scale).

3.Place the eraser into the beaker and use a pipette to aspirate the volume of liquid V higher than the scale.

3） p=m/v

Materials required: water, cup, balance.

Steps: 1, Put the eraser into the quilt filled with water, calculate the volume of the eraser L2 according to the overflowing water, and weigh the eraser mass s with a balance

3. Calculate the rubber density.

Eraser density = s l

1) Required materials: scale, tray balance (2) Experimental methods and steps: : Measure the mass of the eraser m: Measure the length, width and height of the eraser abh: Calculate.

3) Indicate the density of the plasticine according to the letters used in the protocol: m (abh).

Note: If the eraser is irregular, a graduated cylinder, water, and the volume of the eraser are measured using the drainage method.

Graduated cylinders, balances, water.

1.First, measure its mass m. with a balance

2. Add a certain amount of water to the vector cylinder and write down the reading as v1

3Put the eraser in it and read v2

The density is m v1-v2

a. The cork socks will float in the water, indicating that the density of the cork is less than the density of the water, so A does not meet the topic;

B. People can float on the water with only their heads exposed, or they can dive into the water very easily, Ye Na shows that the average density of people is close to the density of water, so B is in line with the topic;

c. The commonly used ordinary eraser will sink when put into water, indicating that the density of the eraser is greater than the density of water, so C does not meet the topic;

d. Ordinary glass will sink when put into water, indicating that the density of glass is greater than the density of water, so D does not slow down the spinal stimulation in line with the topic;

Therefore, choose B

As shown in the figure below, the front ant is measured:

The measurement results are centimeters;

So the answer is: Senki finger.