Question

Площа поперечного перерізу мідного дроту дорівнює 2 мм2. Визнач його масу, якщо відомо, що довжина становить 10 метрів. Розв'язок поясни.

Answer 1

Ответ:

178г.

Объяснение:

S=2мм²=0,000002м²

l=10м

р=8900кг/м³

m-?

V=S×l=0,00002м³

m=V×p=0,178кг.

Answer 2

I can help you with your question.

The mass of a copper wire can be calculated by multiplying its volume and density. The volume of a wire is equal to the product of its cross-sectional area and length. The density of copper is about 8.96 g/cm$^3$.

Using these formulas, we can find the mass of the copper wire as follows:

$$ \begin{aligned} m &= V \cdot \rho \\ &= A \cdot l \cdot \rho \\ &= \pi r^2 \cdot l \cdot \rho \\ &= \pi \cdot (1 \text{ mm})^2 \cdot 10 \text{ m} \cdot 8.96 \text{ g/cm}^3 \\ &= 0.2827 \text{ kg} \end{aligned} $$

Therefore, the mass of the copper wire is about 0.283 kg. You can find more information about the electrical resistance of copper wires in [this source](https://subject.com.ua/teaching/physics/zno/12.html).