thusokiu2011 thusokiu2011

15-01-2024
Physics

contestada

Thanh OA đồng chất, tiết diện đều dài 60 cm, có trọng lượng 4N được đặt như hình vẽ, tại B ( AB = 20 cm) người ta đặt một vật khối lượng m = 0 kg. Tìm lực căng dây và phản lực tại O.

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