Physics, 21.07.2021 20:20 alyonaprotopopova
một sóng cơ truyền trên 1 sợi dây đàn hồi rất dài phường trình sóng tại 1 điểm trên u=4cos(20πt -πx/3)(mm) với x đo bằng mét t đo bằng dây tốc độ truyền sóng trên sợi dây có giá trị
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một sóng cơ truyền trên 1 sợi dây đàn hồi rất dài phường trình sóng tại 1 điểm trên u=4cos(20πt -πx/...
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