Question

Вага деталі у повітрі 8,5 Н, а у воді - 7,5 Н. Визначити густину речовини, з якої виготовлена деталь. Густина води 1000 кг/м 3 .

Answer 1

Ответ:

5667 кг/м³

Объяснение:

В воде на деталь действует сила Архимеда, поэтому вес детали в воде меньше

В воздухе вес детали равен силе тяжести

F тяжести = mg = 8.5 H

Вычислим массу детали: m = F тяжести / g = 8.5 H / 10 (м/с²)= 0.85 кг

Вес в воде:

P = mg - p(воды)gV = 7.5 Н, где V - объем детали

V = (mg - P)/p(воды)g =  (8.5 H - 7.5 Н)/(1000 кг/м³ * 10 (м/с²))

m = p(детали)*V

p(детали) = m / V = (F тяжести / g) / (mg - P)/p(воды)g =

= F тяжести * p(воды)/(mg - P) = 8.5 H * 1000 кг/м³ / (8.5 H - 7.5 Н) =

= 5667 кг/м³

Answer 2

Calculating the Density of the Material

To calculate the density of the material from which the part is made, we can use the formula:

Density = Weight / Volume

Given that the weight of the part in the air is 8.5 N and in water is 7.5 N, and the density of water is 1000 kg/m^3, we can calculate the density of the material.

First, let's calculate the volume of the part using the weight in water and the weight in air.

The weight of the part in water is less than in air due to the buoyant force acting on it. The buoyant force is equal to the weight of the water displaced by the part. Therefore, the weight difference between the part in air and in water is equal to the weight of the water displaced by the part.

Calculating the Volume of the Part

The volume of the part can be calculated using the weight difference between the part in air and in water, and the density of water.

Volume = Weight in air - Weight in water / Density of water

Substitute the given values: Volume = (8.5 N - 7.5 N) / 1000 kg/m^3

Calculating the Density of the Material

Now that we have the volume of the part, we can calculate the density of the material using the formula:

Density = Weight / Volume

Substitute the given weight in air and the calculated volume: Density = 8.5 N / Volume

By calculating the volume and using it to find the density, we can determine the density of the material from which the part is made.