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Консультация № 66121
08.12.2006, 16:35
0.00 руб.
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Здравствуйте Уважаемые эксперты ! Может снова чего-то "не вижу" в задаче...:: В стальной сосуд (Сс=460 Дж/кгК) массой Мс=0.3кг налили воду Мв=1,5 кг при То=17гр.С. В воду опустили кусок мокрого снега(L=330000 Дж/кг) массой Мс=0,2 кг. Когда снег растаял установилась температура Тк=7 гр.С. Какое количество воды было в снеге? Решение: Q1=Cc*Mc; Q2=Cв*Мв*(Тк-То); Q3=L*Мс; Q4=Мвх*Св*(Тк-Твх) где Твх=0 гр.С ,а Мвх- искомая масса воды; Q1+Q2+Q3+Q4=0 => Cc*Mc+Cв*Мв*(Тк-То)+L*Мс+Мвх*Св*(Тк-Твх)=0 => Мвх=0,117 кг-неверный мой ответ Правильный ответ 0,023 кг...
Обсуждение
10.12.2006, 02:24
общий
это ответ
Здравствуйте, Алексей Тимофеев!
Во-первых, привыкните вводить разные обозначения для разных величин. У Вас Мс и масса сосуда, и масса снега...
Во-вторых, в формуле для Q1 вы потеряли температуру.
В-третьих, плавится в Q3 не все 0.2 кг, а только безводная часть снега.
В-четвертых, нагревается в Q4 не только "водная" часть снега, но и вода от "талого" снега тоже.
Многовато для одной задачи...
Процессы:
1. Нагрев сосуда от То до Тк (Индекс обозначим ст)
2. Охлаждение воды от То до Tк
3. Плавление "чистого" снега (без воды в нем) (Индекс сн)
4. Нагревание воды массой равной талому "чистому" снегу, от 0 до Тк
Нагревание воды, содержавшейся исходно в снеге, от 0 до Тк
Последние 2 процесса эквивалентны нагреванию воды массой равной мокрому снегу от 0 до Тк.
Ccт*Mcт*(Tк-To)+Cв*Мв*(Тк-То)+L*(Mcн-Мвх)+Св*Mcн*(Тк-273.15 К)=0
(Ccт*Mcт+Cв*Мв)*(Тк-То)+L*Mcн-L*Мвх+Св*Mcн*(Тк-273.15 К)=0
Мвх=[(Ccт*Mcт+Cв*Мв)*(Тк-То)+L*Mcн+Св*Mcн*(Тк-273.15 К)]/L=[(460Дж/кг*0.3кг+4.19*10^3Дж/кг/К*1.5кг)*(7-17)К+3.3*10^5Дж/кг*0.2кг+4.19*10^3Дж/кг/К*0.2кг*(7-0)К]/(3.3*10^5Дж/кг)=[(138Дж+6285Дж)*(-10К)+6.6*10^4Дж+5.866*10^3Дж]/(3.3*10^5Дж/кг))=[-64230+66000+5866]кг/330000=0.0231 кг
Удачи Вам!
Во-первых, привыкните вводить разные обозначения для разных величин. У Вас Мс и масса сосуда, и масса снега...
Во-вторых, в формуле для Q1 вы потеряли температуру.
В-третьих, плавится в Q3 не все 0.2 кг, а только безводная часть снега.
В-четвертых, нагревается в Q4 не только "водная" часть снега, но и вода от "талого" снега тоже.
Многовато для одной задачи...
Процессы:
1. Нагрев сосуда от То до Тк (Индекс обозначим ст)
2. Охлаждение воды от То до Tк
3. Плавление "чистого" снега (без воды в нем) (Индекс сн)
4. Нагревание воды массой равной талому "чистому" снегу, от 0 до Тк
Нагревание воды, содержавшейся исходно в снеге, от 0 до Тк
Последние 2 процесса эквивалентны нагреванию воды массой равной мокрому снегу от 0 до Тк.
Ccт*Mcт*(Tк-To)+Cв*Мв*(Тк-То)+L*(Mcн-Мвх)+Св*Mcн*(Тк-273.15 К)=0
(Ccт*Mcт+Cв*Мв)*(Тк-То)+L*Mcн-L*Мвх+Св*Mcн*(Тк-273.15 К)=0
Мвх=[(Ccт*Mcт+Cв*Мв)*(Тк-То)+L*Mcн+Св*Mcн*(Тк-273.15 К)]/L=[(460Дж/кг*0.3кг+4.19*10^3Дж/кг/К*1.5кг)*(7-17)К+3.3*10^5Дж/кг*0.2кг+4.19*10^3Дж/кг/К*0.2кг*(7-0)К]/(3.3*10^5Дж/кг)=[(138Дж+6285Дж)*(-10К)+6.6*10^4Дж+5.866*10^3Дж]/(3.3*10^5Дж/кг))=[-64230+66000+5866]кг/330000=0.0231 кг
Удачи Вам!
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