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Physics, 17.10.2021 06:20 sanchez7489
Một sóng cơ lan truyền trên một sợi dây đàn hồi rất dài. Phương trình sóng tại điểm M trên dây là u = 4 cos(20 πt) (cm). Coi biên độ sóng không thay đổi. Thời điểm t, li độ của M bằng 3cm thì ở thời điểm t + 0,25s li độ của M s bằng
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Một sóng cơ lan truyền trên một sợi dây đàn hồi rất dài. Phương trình sóng tại điểm M trên dây là u...
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