Question

Рассчитайте силу давления воздуха, которая действует на книгу, лежащую на столе при нормальном атмосферном давлении, если площадь поверхности книге 300 см в квквадрате.Почему легко поднять книгу со стола? Решение нужно с Дано. Заранее спасибо

Answer 1

F=pS
F=100000*0,03=3000Н

Answer 2

To calculate the force of air pressure acting on the book, we can use the formula:

Force = Pressure x Area

Given: - Area of the book's surface = 300 cm²

We need to find the force of air pressure. However, the atmospheric pressure is not provided in the question. The atmospheric pressure at sea level is approximately 101.3 kilopascals (kPa) or 1 atmosphere (atm).

Assuming the normal atmospheric pressure, we can calculate the force of air pressure on the book as follows:

Step 1: Convert the area from cm² to m²: - 1 cm² = 0.0001 m² - Area of the book's surface = 300 cm² = 300 x 0.0001 m² = 0.03 m²

Step 2: Calculate the force of air pressure: - Pressure = Atmospheric pressure = 101.3 kPa = 101.3 x 1000 Pa (since 1 kPa = 1000 Pa) - Force = Pressure x Area = (101.3 x 1000 Pa) x 0.03 m²

Now, let's calculate the force of air pressure on the book:

pressure = 101.3 * 1000  # Pa
area = 0.03  # m²

force = pressure * area
force

The force of air pressure acting on the book is approximately 3,039 N (Newtons).

Now, let's discuss why it is easy to lift the book from the table:

The reason it is easy to lift the book from the table is that the force of gravity acting on the book is much greater than the force of air pressure. The weight of the book is the force exerted by gravity on the book due to its mass. When we lift the book, we overcome the force of gravity by applying a force greater than the weight of the book. The force of air pressure, although present, is relatively small compared to the force of gravity, making it easy to lift the book.

I hope this helps! Let me know if you have any further questions.