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Physics, 06.12.2021 14:00 cici86

một chiếc thước AB có chiều dài 60cm có thể quay trong mặt phẳng thẳng đứng quanh trục cố định nằm ngang đi qua đầu A. Tác dụng vào đầu B một lực có phương nằm trong mặt phẳng thẳng đứng, có độ lớn F = 4N, hướng của lực hợp với AB một góc 37. Mô men lực có độ lớn bằng

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một chiếc thước AB có chiều dài 60cm có thể quay trong mặt phẳng thẳng đứng quanh trục cố định nằm n...
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