Предмет: Физика, автор: nonsennnse

На рисунке брусок, изготовленный из алюминия.
Найдите объем бруска:
высота:450 мм, длина:915 мм, ширина: 435 мм
1. Выразите размеры в см.
2. Определить обьем бруска:
V =см3=м3?(в кубических метрах и сантиметрах)
3. Вычислить массу бруска в килограммах
4. Определить количество теплоты, которое требуется для нагревания этого бруска от температуры 25 °С до температуры плавления:(660 градусов)Q1=Дж
4. Определить количество теплоты, которое требуется для плавления этого бруска (уже нагретого до температуры плавления)Q2=Дж
5. Какое количество теплоты было затрачено на все агрегатные изменения данного тела?

Ответы

Автор ответа: Disiachka
0
1. Размеры в сантиметрах:
- Высота: \(45 \ \text{см}\) (450 мм)
- Длина: \(91.5 \ \text{см}\) (915 мм)
- Ширина: \(43.5 \ \text{см}\) (435 мм)

2. Объем бруска:
\[ V = \text{Высота} \times \text{Длина} \times \text{Ширина} \]

Результат в кубических сантиметрах (\(\text{см}^3\)) и кубических метрах (\(\text{м}^3\)).

3. Масса бруска в килограммах:
\[ \text{Масса} = \text{Объем} \times \text{Плотность алюминия} \]

Для алюмінію плотність приблизно \(2.70 \ \text{г/см}^3\).

4. Количество теплоты для нагревання до температуры плавления:
\[ Q_1 = \text{Масса} \times \text{Удельная теплоємність алюмінію} \times \text{ΔТ} \]

ΔТ - різниця в температурі (зазвичай виражається у градусах Цельсія).

5. Количество теплоты для плавления бруска:
\[ Q_2 = \text{Масса} \times \text{Теплота плавления алюмінію} \]

6. Загальне кількість теплоти для всіх агрегатних змін тіла:
\[ Q_{\text{заг}} = Q_1 + Q_2 \]

Будь ласка, визначте конкретні значення температур і констант для розрахунків.
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