Question

Книга массой 400 грамм давит на стол, размер книги 21см на 30см. Найти давление книги на стол.

Answer 1

Ответ: p=63,5 Па

Объяснение: Переведём всё в Си*
400г- 0,4 кг
21см- 0,21м
30см- 0,3м
И сначала найдём силу, действующую на книгу
По формуле F-mg
F= 0,4*10=4 Н
А теперь площадь этой книги
S-ab
S= 0,21*0,3= 0,063 м³
А теперь найдём давление
p- F
S
p= 4:0,063= 63,5 Па
Ответ: p= 63,5 Па

Answer 2

Calculating Pressure Exerted by the Book

To calculate the pressure exerted by the book on the table, we can use the formula:

Pressure = Force / Area

The force exerted by the book is its weight, and the area in contact with the table is the base of the book.

Given: - Mass of the book = 400 grams - Dimensions of the book = 21 cm x 30 cm

First, let's convert the mass of the book from grams to kilograms: - 400 grams = 0.4 kilograms

Now, we can calculate the force exerted by the book (its weight) using the formula: - Force = Mass x Acceleration due to gravity - Acceleration due to gravity is approximately 9.81 m/s^2

Let's calculate the force: - Force = 0.4 kg x 9.81 m/s^2

Force = 3.924 N

Next, we need to calculate the area in contact with the table. The area can be calculated by multiplying the length and width of the book.

Given: - Length of the book = 21 cm - Width of the book = 30 cm

Let's convert the dimensions to meters: - Length = 21 cm = 0.21 m - Width = 30 cm = 0.30 m

Now, we can calculate the area: - Area = Length x Width - Area = 0.21 m x 0.30 m

Area = 0.063 m^2

Now, we can calculate the pressure exerted by the book on the table using the formula: - Pressure = Force / Area

Let's calculate the pressure: - Pressure = 3.924 N / 0.063 m^2

Pressure ≈ 62.29 Pa

So, the pressure exerted by the book on the table is approximately 62.29 Pascals.