Question

Железобетонная плита объёмом 0.2м( в кубе )погружена в воду.Вычислить выталкивающую силу, действующую на неё.

Answer 1

Fa=плотность воды (ро) × скорость свободного падения (g) × обьем тела (v)
Fa= 1000 Кг/м^3 × 9.8 Н/кг × 0.2 м^3= 1960 Н = 1.96 кН

Answer 2

Calculation of Buoyant Force on a Concrete Slab

To calculate the buoyant force acting on a concrete slab submerged in water, we need to consider the principles of buoyancy. Buoyancy is the upward force exerted by a fluid on an object immersed in it. It is equal to the weight of the fluid displaced by the object.

In this case, the concrete slab has a volume of 0.2 cubic meters. To calculate the buoyant force, we need to determine the weight of the water displaced by the slab, which is equal to the weight of the slab itself.

The weight of the slab can be calculated using the formula:

Weight = Density x Volume x Gravity

The density of concrete can vary, but a typical value is around 2400 kg/m^3. The acceleration due to gravity is approximately 9.8 m/s^2.

Substituting the given values into the formula, we can calculate the weight of the slab:

Weight = 2400 kg/m^3 x 0.2 m^3 x 9.8 m/s^2

Now, let's calculate the buoyant force:

Buoyant Force = Weight of Water Displaced = Weight of Slab

Therefore, the buoyant force acting on the concrete slab submerged in water is equal to the weight of the slab itself.

Please note that the specific density of the water is not provided in the question. However, the buoyant force depends only on the weight of the water displaced, which is equal to the weight of the slab. So, we do not need the specific density of water to calculate the buoyant force.

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