Question

1,35 кг/м3г Медная, чугунная и стальная детали объёмом 200 см3 каждая имеют массы, соответственно 1,78 кг, 1,4 кг и 1,56 кг. Какая из них обладает плотностью меньшей, чем цинк?

Answer 1

Чугун имеет меньше плотность, чем цинк.
у чугуна плотность 7000 кг/м3,а у цинка 7100 кг/м3
(медь-8900 кг/м3; сталь-7800 кг/м3

Answer 2

Calculation of Density

To determine which of the given materials (copper, cast iron, and steel) has a lower density than zinc, we need to calculate the density of each material. Density is defined as mass per unit volume.

The mass and volume of each material are given as follows: - Copper: mass = 1.78 kg, volume = 200 cm^3 - Cast iron: mass = 1.4 kg, volume = 200 cm^3 - Steel: mass = 1.56 kg, volume = 200 cm^3

To calculate the density, we can use the formula: Density = Mass / Volume

Let's calculate the density for each material:

1. Copper: - Mass = 1.78 kg - Volume = 200 cm^3 - Density = 1.78 kg / 200 cm^3 = 0.0089 kg/cm^3

2. Cast iron: - Mass = 1.4 kg - Volume = 200 cm^3 - Density = 1.4 kg / 200 cm^3 = 0.007 kg/cm^3

3. Steel: - Mass = 1.56 kg - Volume = 200 cm^3 - Density = 1.56 kg / 200 cm^3 = 0.0078 kg/cm^3

Comparison with Zinc

Now, let's compare the densities of copper, cast iron, and steel with the density of zinc. Unfortunately, the density of zinc is not provided in the question. To determine which material has a lower density than zinc, we need to know the density of zinc.

If you can provide the density of zinc, I can compare it with the densities of copper, cast iron, and steel to determine which material has a lower density.