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Physics, 27.10.2021 01:00 amazingmariah1234

Thanh AD có trọng lượng không đáng kể,đươc giữ nằm ngang cân bằng nhờ bản lề cố định A và sợi dây treo CE không giãn nghiêng một góc 30° so với phương nằm ngang, tại B treo vật có trọng lượng P=10KN như hình. Lực chủ động là ?

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Thanh AD có trọng lượng không đáng kể,đươc giữ nằm ngang cân bằng nhờ bản lề cố định A và sợi dây tr...
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