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Консультация № 190084
20.11.2016, 16:05
0.00 руб.
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1
Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Задача. Шар радиусом R вращается вокруг своей оси. При его торможении частота уменьшается от V1 до v2. При этом к % выделяющейся энергии идет на нагрев шара и его температура увеличивается на At. Металл, из которого состоит шар, и его плотность р приведены в таблице. Определите величину, указанную в таблице знаком вопроса.
R. см ---- 12
V1, с-1 ----300
v2. С-1 ----?
к, % ------40
At, °С ----4
Металл ----А1
р, кг/м3 ----2700
Задача. Шар радиусом R вращается вокруг своей оси. При его торможении частота уменьшается от V1 до v2. При этом к % выделяющейся энергии идет на нагрев шара и его температура увеличивается на At. Металл, из которого состоит шар, и его плотность р приведены в таблице. Определите величину, указанную в таблице знаком вопроса.
R. см ---- 12
V1, с-1 ----300
v2. С-1 ----?
к, % ------40
At, °С ----4
Металл ----А1
р, кг/м3 ----2700
Обсуждение
23.11.2016, 12:05
общий
это ответ
Здравствуйте, crater.10!
Запишем условие задачи снова, уточняя обозначения и формулировки.
Шар радиусом
м вращается вокруг своей оси. При его торможении частота вращения уменьшается от 
с[sup]-1[/sup] до 
При этом 
выделяющейся энергии идёт на нагрев шара и его температура увеличивается на 
К. Материал шара - алюминий (плотность 
кг/м[sup]3[/sup]). Определить
Масса шара составляет
Момент инерции шара при вращении вокруг своей оси составляет
Удельная теплоёмкость алюминия составляет
Дж/(кг*К). Чтобы нагреть шар на 
нужно затратить количество теплоты
которое составляет
от выделяющейся энергии 
или 
откуда получим
(с-1).
Запишем условие задачи снова, уточняя обозначения и формулировки.
Шар радиусом
м вращается вокруг своей оси. При его торможении частота вращения уменьшается от с[sup]-1[/sup] до При этом выделяющейся энергии идёт на нагрев шара и его температура увеличивается на К. Материал шара - алюминий (плотность кг/м[sup]3[/sup]). Определить Масса шара составляет
Момент инерции шара при вращении вокруг своей оси составляет
Удельная теплоёмкость алюминия составляет
Дж/(кг*К). Чтобы нагреть шар на нужно затратить количество теплотыкоторое составляет
от выделяющейся энергии или откуда получим (с-1).
5
Спасибо огромное вы очень помогли.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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