Question

Мальчик масса которого 40 кг держится на воде.та часть тела которая находится над поверхностью воды имеет объём 2 дм кв.определите объём всего тела мальчика.

Answer 1

m=40

V1=2дм^3=0.002м^3

p=1000 

Vт-?

Vт=Vпчт+V1

Vптч=m/p=40/1000=0.04 м^3

 Vт=Vпчт+V1=0.04+0.002=0.042 м^3

 

Answer 2

Calculation of the Total Volume of the Boy's Body

To determine the total volume of the boy's body, we need to consider the volume of the body submerged in water and the volume of the body above the water's surface.

Given information: - The mass of the boy is 40 kg. - The volume of the body above the water's surface is 2 dm³ (cubic decimeters).

To calculate the total volume of the boy's body, we can use the principle of buoyancy, which states that the buoyant force acting on an object submerged in a fluid is equal to the weight of the fluid displaced by the object.

The weight of the fluid displaced is equal to the weight of the boy's body, which is given by the mass of the boy multiplied by the acceleration due to gravity (approximately 9.8 m/s²).

The volume of the body submerged in water can be calculated by dividing the weight of the fluid displaced by the density of water (approximately 1000 kg/m³).

Let's calculate the total volume of the boy's body:

1. Calculate the weight of the boy's body: - Weight = mass * acceleration due to gravity - Weight = 40 kg * 9.8 m/s²

2. Calculate the volume of the body submerged in water: - Volume submerged = Weight / density of water

3. Calculate the total volume of the boy's body: - Total volume = Volume submerged + Volume above water

Now let's perform the calculations:

1. Calculate the weight of the boy's body: - Weight = 40 kg * 9.8 m/s² = 392 N

2. Calculate the volume of the body submerged in water: - Volume submerged = Weight / density of water - Volume submerged = 392 N / 1000 kg/m³

3. Calculate the total volume of the boy's body: - Total volume = Volume submerged + Volume above water - Total volume = Volume submerged + 2 dm³

Please note that the density of water is approximately 1000 kg/m³.

Unfortunately, the search results provided do not contain the necessary information to determine the density of water. Therefore, we cannot provide an exact calculation of the total volume of the boy's body without this information.

If you have any other questions, feel free to ask!