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thaiquynhanh2007
2 năm trước
Cần cung cấp một nhiệt lượng bằng bao nhiêu để đun sôi 5kg nước ở 30 độ C, biết ấm đựng nước làm bằng nhôm có khối lượng 200g và môi trường ngoài hấp thụ một nhiệt lượng bằng 1/20 nhiệt lượng do ấm nước thu vào. Nhiệt dung riêng của nhôm là 880J/kg.K; của nước là 4200J/kg.K *
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