Câu 7: Một nồi nhôm có khối lượng 150g chứa 2,5 kg nước ở 250C . a. Tính nhiệt lượng cần thiết để cho nồi nước tăng đến 650C. Biết nhiệt dung riêng của nhôm và nước lần lượt là 880J/ kg.K, 4200J/kg.K b. Với nhiệt lượng của câu a có thể làm cho một quả cầu bằng kim loại có nhiệt dung riêng 460J/kg.K và có khối lượng 15 kg tăng thêm bao nhiêu độ? Tìm nhiệt độ của quả cầu khi đó ? Biết nhiệt độ ban đầu quả cầu là 23,40C

Các câu hỏi liên quan

3. My father was in Ha Noi three weeks ago. . .......................................................................................................................................... 4. Nam played badminton with Minh. . .......................................................................................................................................... 5. She went to the doctor because she had a backache. . .......................................................................................................................................... 6. The students are practicing their English at the moment. . .......................................................................................................................................... 7. He had an appointment at 10.30. . .......................................................................................................................................... 8. They travelled to the USA by plane last month. . .......................................................................................................................................... 9. No. I don’t really like cartoons. I prefer movies. . .......................................................................................................................................... 10. I’d love to. I really like pop music. . .......................................................................................................................................... III. Change into negative and interrogative form: 1. Her mother wrote a sick note for her. . .......................................................................................................................................... . .......................................................................................................................................... 2. Nam was absent from school yesterday. . .......................................................................................................................................... . .......................................................................................................................................... 3. I had a bad cold two days ago. . .......................................................................................................................................... . .......................................................................................................................................... 4. Many students caught flu last month. . .......................................................................................................................................... . .......................................................................................................................................... 5. They were happy with their life. . .......................................................................................................................................... . .......................................................................................................................................... 6. He suggested going out for dinner. . .......................................................................................................................................... . .......................................................................................................................................... 7. I was busy last Sunday. . .......................................................................................................................................... . .......................................................................................................................................... 8. We enjoyed our summer vacation. . .......................................................................................................................................... . .......................................................................................................................................... 9. Children should spend little time playing video games. . .......................................................................................................................................... . .......................................................................................................................................... 10. We often play table tennis together. . .......................................................................................................................................... . ........................................................................................