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Консультация № 190404
10.01.2017, 19:48
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Бармен хочет изготовить 0,5 кг льда из дистиллированной воды. Для этого он
наливает в открытый сосуд M = 1 кг воды при температуре T1 = 20C и начинает
понемногу подливать в сосуд кипящий жидкий азот (которого в баре много), имеющий
температуру T2 = -196C. При этом смесь воды и жидкого азота всё время энергично
перемешивается. Когда весь азот из сосуда испаряется, его доливают ещё, и так много раз,
до получения желаемого количества смеси воды со льдом. За какую цену бармен должен
продать получившийся лед, чтобы получить 10% прибыли, если стоимость 1 кг жидкого
азота 200 р? Теплоёмкостью сосуда и его теплообменом с окружающей средой можно
пренебречь. Удельная теплоёмкость воды C = 4200 Дж/(кгC), удельная теплота
плавления льда = 3;4105 Дж/кг, удельная теплота парообразования азота L = 2;0105
Дж/кг. Считать, что затратами является только стоимость жидкого азота.
Спасибо.
Бармен хочет изготовить 0,5 кг льда из дистиллированной воды. Для этого он
наливает в открытый сосуд M = 1 кг воды при температуре T1 = 20C и начинает
понемногу подливать в сосуд кипящий жидкий азот (которого в баре много), имеющий
температуру T2 = -196C. При этом смесь воды и жидкого азота всё время энергично
перемешивается. Когда весь азот из сосуда испаряется, его доливают ещё, и так много раз,
до получения желаемого количества смеси воды со льдом. За какую цену бармен должен
продать получившийся лед, чтобы получить 10% прибыли, если стоимость 1 кг жидкого
азота 200 р? Теплоёмкостью сосуда и его теплообменом с окружающей средой можно
пренебречь. Удельная теплоёмкость воды C = 4200 Дж/(кгC), удельная теплота
плавления льда = 3;4105 Дж/кг, удельная теплота парообразования азота L = 2;0105
Дж/кг. Считать, что затратами является только стоимость жидкого азота.
Спасибо.
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