Предмет: Физика, автор: ewerghji

Помогите, пожалуйста! Даю 35 баллов!

Через змеевик, который вмерз в лед, проходит 2 кг вода при температуре 97 ºC. Какое количество льда можно расплавить таким образом, если температура воды на выходе из змеевика равна 6 ºC.

Ответы

Автор ответа: inthehell666
0

Ответ:

дано:

М = 2 кг.

t1 = 97°;

t2 = 6°C.

m = ?

решение:

Если исходная температура льда = 0°С, то:

теплоёмкость воды: с = 4200 Дж/(кг·град), теплота плавления льда: r = 3,4*10^5 Дж/кг. 

Тогда: m*r = M*c*(t1 – t2); ==> m = M*c*(t1 – t2)/r= 2*4200*(97-6)/(3.4*10^5) = 2,248 кг = ~2,25 кг.

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