Thả 1 miếng đồng khối lượng 0,5kg vào 500g nước. Miếng đồng nguội đi từ 100°c xuống 20°c. Hãy cho biết nước nóng thêm bao nhiêu nhiệt độ? Biết nhiệt dung riêng của đồng là 380J/kg.k,của nước là 4200J/kg.k

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