Question

внешний диаметр трубы 6,4 дм ,а толщина стенок 0,2 дм. вычислить площадь поперечного среза трубы

Answer 1

s=пи*(R^2-0.02м)

s=3.14(0.64-0.02)=1.9468м^2

Answer 2

Calculation of the Cross-Sectional Area of a Pipe

To calculate the cross-sectional area of a pipe, we need to know the external diameter and the wall thickness of the pipe. In this case, the external diameter of the pipe is 6.4 dm (decimeters) and the wall thickness is 0.2 dm.

The formula to calculate the cross-sectional area of a pipe is:

Cross-sectional area = π * (External radius^2 - Internal radius^2)

Since we only have the external diameter and the wall thickness, we need to calculate the internal diameter first. The internal diameter can be obtained by subtracting twice the wall thickness from the external diameter.

Let's calculate the internal diameter and then use it to find the cross-sectional area of the pipe.

Calculation Steps:

1. Convert the external diameter and wall thickness from decimeters to meters: - External diameter: 6.4 dm = 0.64 m - Wall thickness: 0.2 dm = 0.02 m

2. Calculate the internal diameter: - Internal diameter = External diameter - 2 * Wall thickness - Internal diameter = 0.64 m - 2 * 0.02 m = 0.6 m

3. Calculate the external radius: - External radius = External diameter / 2 = 0.64 m / 2 = 0.32 m

4. Calculate the internal radius: - Internal radius = Internal diameter / 2 = 0.6 m / 2 = 0.3 m

5. Calculate the cross-sectional area: - Cross-sectional area = π * (External radius^2 - Internal radius^2)

Now, let's plug in the values and calculate the cross-sectional area of the pipe.

Calculation:

Cross-sectional area = π * (0.32^2 - 0.3^2)

Using the value of π (pi) as approximately 3.14159, we can calculate the cross-sectional area.

Cross-sectional area = 3.14159 * (0.32^2 - 0.3^2)

Cross-sectional area = 3.14159 * (0.1024 - 0.09)

Cross-sectional area = 3.14159 * 0.0124

Cross-sectional area ≈ 0.0388 square meters

Therefore, the cross-sectional area of the given pipe is approximately 0.0388 square meters.

Please note that the calculations are based on the provided values of the external diameter and wall thickness of the pipe.