Question

Стальная деталь массой 75 г имеет объём 15 см кубических. Определите , есть ли внутри полость ? Найдите объём полости Плотность стали 8,9г/см кубических Ответ выраженный в см кубических округлите до 10

Answer 1

1)ρ=m/Vρ=0.075/0.000015=5000 кг/м3 Деталь (сосчитано)ρ(стали из таблицы)=7800 кг/м3Значит полость имеется.2) ρ(молока)=1027кг/м3m=Vρ=0.0015*1027=1.5405 кг

Answer 2

Calculating the Presence of Cavity and Cavity Volume

To determine if the steel detail has a cavity and find the volume of the cavity, we can use the given information about the mass, volume, and density of the steel.

Given: - Mass of steel detail, m = 75 g - Volume of steel detail, V = 15 cm^3 - Density of steel, ρ = 8.9 g/cm^3

Determining the Presence of Cavity

To determine if there is a cavity inside the steel detail, we can use the relationship between mass, volume, and density:

Density = Mass / Volume

We can rearrange this equation to solve for the mass and volume separately:

Mass = Density × Volume

Now, we can calculate the mass of the steel detail using the given density and volume: ``` Mass = Density × Volume = 8.9 g/cm^3 × 15 cm^3 ≈ 133.5 g ``` The calculated mass (133.5 g) is different from the given mass (75 g), indicating that there is a cavity inside the steel detail.

Finding the Volume of the Cavity

To find the volume of the cavity, we can use the difference between the actual mass and the mass of the steel without the cavity.

The mass of the steel without the cavity can be calculated using the given density and the actual mass of the steel detail: ``` Mass of steel without cavity = Actual Mass - Mass of Cavity = 75 g - 133.5 g = -58.5 g ``` The negative value indicates that the mass of the steel without the cavity cannot be determined using the given information. Therefore, the volume of the cavity cannot be accurately calculated.

Conclusion

Based on the calculations, it can be concluded that there is a cavity inside the steel detail, but the volume of the cavity cannot be accurately determined with the given information.