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hoangminhvu2001
2 năm trước
khi nhiệt độ tăng thêm 1oC thì độ dài của 1 dây đồng 1m tăng thêm 0,017 mm.Nếu độ tăng độ dài do nở vì nhiệt tỉ lệ với độ dài ban đầu và độ tăng nhiệt độ của vật thì 1 dây dẫn bằng đồng dài 30m ở nhiệt độ 20oC sẽ có độ dài bằng bao nhiêu khi ở nhiệt độ 80oC?
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