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2 năm trước
Cho hệ vật như hình vẽ: m1 = 3kg, m2 = 2kg, alpha = 30 độ. Bỏ qua ma sát, khối lượng của dây và khối lượng ròng rọc. Lấy g = 10m/s2. a. Tính gia tốc chuyển động của mỗi vật b. Tính lực nén lên trục ròng rọc. c. Sau bao lâu kể từ khi bắt đầu chuyển động từ trạng thái đứng yên thì hai vật ở ngang. Biết lúc đầu m1 ở vị trí thấp hơn m2 0,75m.
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