Một chất điểm dao động điều hòa trên một đường thẳng quanh vị trí cân bằng O với chu kì \(T=0,314s\). Biết rằng khi \(t=0\)vật ở li độ \(x=-6cm\)với vận tốc bằng không.

a) Viết phương trình dao động. Tính giá trị vận tốc cực đại.

b) Tính vận tốc và gia tốc của chất điểm ở thời điểm \(t=\frac{\pi}{15}s\)và chiều chuyển động của nó.

c) Tính vận tốc khi \(x=3cm\)

có BN chữ Q

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Chiếu một chùm tia sáng trắng hẹp coi như một tia sáng vào một lăng kính có tiết diện thẳng là tam giác cân ABC, có góc chiết quang \(A=5^0\)theo phương vuông góc với mặt phẳng phân giác của góc chiết quang tại một điểm tới rất gần A. Biết \(n_t=1,54\)và \(n_đ=1,5\). Quang phổ hứng được trên một màn đặt song song và cách mặt phẳng phân giác của lăng kính là 2m. Tính bề rộng quang phổ thu được trên màn.

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