Предмет: Физика, автор: Timka1233211

Стальную болванку массой 150 г, раскаленную до 650оС, опускают для закалки в сосуд, содержащий 800 г воды при температуре 15оС. Какова удельная теплоемкость стали, если вода нагрелась до 28оС?

С дано и т.д пожалуйста.

Ответы

Автор ответа: WiLdToNnY
0
Дано:
Сталь
m_1=150  _Gamma=0,15  _K_Gamma \ t_1=650  кC
t=28  кC - температура на которую остынет раскаленная болванка
Вода
m_2=800  _Gamma =0,8  _K_Gamma \ t_2=15  кC
c=4200 Дж/кг·°С - удельная теплоёмкость воды
t=28  кC - конечная температура воды
Найти: 
c=  ? 
Решение: 
Уравнение теплового баланса:
                        Q_1=Q_2 \ c_1cdot m_1cdot (t_1-t)=c_2cdot m_2cdot (t-t_2)
Откуда удельная теплоемкость стали: 
                  c_1= frac{c_2cdot m_2cdot (t-t_2)}{m_1cdot (t_1-t)} = frac{4200cdot 0,8cdot (28-15)}{0,15cdot (650-28)} approx 468,1672 Дж/кг·°С

Автор ответа: Timka1233211
0
В Найти это m1?Просто вроде-бы в дано оно уже есть.
Автор ответа: WiLdToNnY
0
Упс)
Автор ответа: WiLdToNnY
0
Исправил) Не правильно просто написал!
Автор ответа: Timka1233211
0
Бывает:D
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Mr. Healthy

John Healthy is a neighbor of mine. He is a keep - fit fan. Every day he goes jogging in
the park after work. He gets up very early in the morning and goes to work on foot. He is a
vegetarian and always buys his fruit and vegetables on a farm near our town. He always
drinks fruit juice and water. He goes to bed at 10 p.m. he hasn’t got a TV set at home but he
sometimes buys the newspaper and listens to the music.
John often invites his friends to spend the weekend with him. They have a big and
substantial breakfast in the morning. John lays the table and everybody helps him. They put
many different things on the table – different kinds of cereals, cornflakes and muesli;
yoghurt, porridge, fruit juice, water, hot and cold milk, tea and coffee; bread and butter,
toast, cheese, boiled eggs, jam, marmalade and a bowl of fresh fruit.
They have lunch together, talk a lot and have much fun. John Healthy seems to be
happy because he has a very healthy life.
Task 1. Write True or False. Correct the false sentences.
Напиши: Правда или ложь. Исправь неправильные предложения.
1. John hates jogging
2. He never gets up late and he usually walks to work.
3. He doesn’t like any fruit juice.
4. Every evening he watches TV at home.
5. Every day he buys the newspaper.
6. John prepares breakfast for him and his friends at weekends.
7. They have a lovely time together.
8. John Healthy feels unhappy because he hasn’t got any friends.
Task 2. Answer the following questions on the text.
Ответь на вопросы по тексту.
1. Does John Healthy like walking and running?
2. What does he do when he finishes work?
3. How does he go to work?
4. Where does he buy his food?
5. Why doesn’t he eat any meat?