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baoanh1392001
2 năm trước
Câu 30: Một bình hình trụ đặt thẳng đứng có đường kính trong 20 cm, được đậy kín bằng một nắp có trọng lượng 20N. Trong bình chứa khí ở nhiệt độ 1000C dưới áp suất bằng áp suất khí quyển 105 N/m2. Khi nhiệt độ trong bình giảm xuống còn 200C nếu muốn mở nắp bình cần một lực tối thiểu bằng
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