Question

с какой силой давит воздух на поверхность стола, длина которого 1,1 м, ширина 50 см, если атмосферное давление равно 750 мм. рт. ст? ​

Answer 1

Ответ:

1) 50 см = 0,5 м

Найдём площадь стола:

S = ab = 1,1 м × 0,5 м = 0,55 м²

2) 750 мм.рт.ст. = 99991,8 Па

3) Найдём силу тяжести по формуле:

F = P × S

F = 99991,8 Па × 0,55 м² = 54 995,49 Н ≈ 54 995 Н

Answer 2

Calculating the Force Exerted by Air on the Table

To calculate the force exerted by the air on the surface of the table, we can use the formula:

Force = Pressure × Area

Where: - Pressure is the atmospheric pressure in pascals (Pa) or newtons per square meter (N/m²). - Area is the surface area in square meters (m²).

Given: - Atmospheric pressure = 750 mmHg (which is equivalent to 101,325 Pa or 101.3 kPa) - Length of the table = 1.1 m - Width of the table = 0.5 m

Calculation

First, let's convert the atmospheric pressure from mmHg to kPa: - 750 mmHg = 750 * 101.3 / 760 = 99.56 kPa

Now, we can calculate the force exerted by the air on the table: - Area = Length × Width = 1.1 m × 0.5 m = 0.55 m² - Force = Pressure × Area = 99.56 kPa × 0.55 m² = 54.758 N

Therefore, the force exerted by the air on the surface of the table is approximately 54.758 Newtons.