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【Daily Question】Theoretical Foundation 2020.03.06

2020-03-06View Original

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Multiple-choice question: A homogeneous rod of mass m and length 2l is initially in a horizontal position, as shown in the figure. After end A detaches, the rod rotates around axis B; when the rod reaches a vertical position, the magnitude of the restraining force at point B of the AB rod is ( ). Answer: D Hint: Extra rewards will be given to those who can explain the solution process; the answer can be seen there!

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