На електричній плитці нагріли 1,2 л води від 10 до 100 градусів за Цельсієм . При цьому 3% перетворилося на пару . Скільки часу тривало нагрівання якщо потужність 600 Вт , а її ККД 65 % ?
The last film I watched was "fantastic critters, and where they inhabit". This movie is about what the main character wants to save, and save a fantastic world, among people. In this he is helped by two golduns, and a man. But that's what's stopping them. But in this they are hindered by the president/mayor of the city(countries.) Says these creatures are quite dangerous for World. That's why she starts to set up the creatures, which prevents her main character. I advise you to see it!
а разве не проще самим придумать?
Объяснение:
The last film I watched was "fantastic critters, and where they inhabit". This movie is about what the main character wants to save, and save a fantastic world, among people. In this he is helped by two golduns, and a man. But that's what's stopping them. But in this they are hindered by the president/mayor of the city(countries.) Says these creatures are quite dangerous for World. That's why she starts to set up the creatures, which prevents her main character. I advise you to see it!
T₀ = 100 °C = 373 К
T = 600 K
λ = 0,25 · 10⁵ Дж/кг
с = 0,13 · 10³ Дж/(кг·К)
Найти:
υ = ?
Решение:
Механическая энергия которой обладает пуля = кинетической энергии пули.:
ΔW = Eк = (m · υ²)/2
Внутренняя энергия пули после застревания равна 60 % от кинетической энергии:
Eк = 0,6 · ΔU = 0,6 · (Q₁ + Q₂)
где Q₁ - тепло которое получается поля после застревания (Дж);
Q₂ - после получения тепла пуля расплавилась (Дж);
Q₁ = c · m · (T - T₀)
Q₂ = λ · m
Составим уравнение:
(m · υ²)/2 = 0,6 · (c · m · (T - T₀) + λ · m)
откуда выразим скорость пули:
υ = √(1,2 · (c · m · (T - T₀) + λ · m)/m)
υ = √(1,2 · (c · (T - T₀) + λ) = √(1,2 · ( 0,13 · 10³ · (600 - 373) + 0,25·10⁵) ≈ 245,8 (м/с)
p.s. сверху - для тех кто с телефона