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thả 1 miếng đồng nặng 500g đang ở nhiệt độ 130đọ C có nhiệt dung riêng C1=390J/Kg.độ, miếng đồng thả vào 1 cốc nước đá đang ở nhiệt độ 0độ C, khối lượng 0,9Kg. Biết rằng nhiệt nóng chảy của nước đá là lam dda1=250J/kg, nhiệt dung riêng của nước ở dạng lỏng là 4200J/Kg. Bỏ qua sự thất thoát nhiệt độ. hãy tính nhiệt độ cuối cùng trong cốc nước nói trên.
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thả 1 miếng đồng nặng 500g đang ở nhiệt độ 130đọ C có nhiệt dung riêng C1=390J/Kg.độ, miếng đồng thả...
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