Question

Как действует архимедова сила

Answer 1

Выталкивающая сила, действующая на тело погруженное в жидкость или газ называется Архимедовой силой. Она всегда противоположна силе тяжести. Например:  бросим шарик в воду, сверху на него действует Архимедова сила, а снизу сила тяжести. Если сила тяжести будет больше Архимедовой, то тело потонет, если же наоборот, сила тяжести будет меньше, то тело всплывёт. А плавает оно когда Архимедова сила равна по модулю силе тяжести. 

Answer 2

How Does the Archimedes' Principle Work?

Archimedes' principle states that a body immersed in a fluid experiences a buoyant force that is equal to the weight of the fluid displaced by the body. This principle is particularly relevant when dealing with objects submerged in liquids and gases.

The formula for calculating the buoyant force (F) acting on an object is given by the equation F = gV, where g is the acceleration due to gravity and V is the volume of the fluid displaced by the object.

Calculation Example

Let's consider an example where an object with a volume of 0.3 m³ is submerged in water. The density of water is approximately 1000 kg/m³, and the acceleration due to gravity is 9.8 m/s².

Using the formula F = gV, we can calculate the buoyant force: F = 9.8 * 0.3 = 2.94 N

Relationship with Weight

The buoyant force can also be related to the weight of the fluid displaced by the object. According to Archimedes' principle, the buoyant force (F) is equal to the weight of the fluid displaced, which can be expressed as F = mg, where m is the mass of the fluid displaced and g is the acceleration due to gravity.

In the example mentioned earlier, the mass of the fluid displaced can be calculated as: m = F / g = 2.94 / 9.8 = 0.3 kg

This means that the object displaces 0.3 kg of water, which is equivalent to 300 grams.

Practical Applications

Archimedes' principle has various practical applications, such as determining the buoyancy of ships, submarines, and other floating objects. It also explains why objects float or sink in fluids and is fundamental in understanding the behavior of fluids and submerged objects.

In summary, Archimedes' principle provides a fundamental understanding of buoyancy and the behavior of objects submerged in fluids, and it has wide-ranging applications in various fields.

If you have further questions or need more information, feel free to ask!