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Physics, 17.12.2021 14:00 xjsg

VD2, Thanh nhẹ AB nằm ngang, chiều dài 1m chịu tác dụng của 3 lực không song song cùng chiều vuông góc với thanh lần lượt là F1=20 N, P=50 N ở 2 đầu thanh, F2=30 N ở chính giữa thanh A, Tìm điểm đặt và độ lớn của hợp lực tác dụng lên thanh,
B, Tìm vị trí đặt giá đỡ để thanh cân bằng, Tỉnh lực nén lên giá đỡ,

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