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phunghuyen1123
2 năm trước
Trên hai đầu A,B một thanh cứng nhẹ có treo hai vật khối lượng lần lượt là m1 và m2 . Người ta dùng lực kế để móc vào một điểm O trên thanh, điểm O cân bằng thì thanh nằm ngang và lực kế chỉ 70N. Tìm khối lượng m1 và m2 , biết chiều dài OA = 40cm, OB = 60cm giúp em với ạ gấp lắm rồi ạ Mng giúp em vứi ạ
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