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Bài 6. Một đĩa quay đều quanh trục qua tâm O được 300vòng/ phút. Tính tốc độ góc, chu kì,tốc độ dài, gia tốc hướng tâm của 1 điểm trên đĩa cách tâm 10cm. Giúp với ạ
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