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【Daily Question】Theoretical Foundation 2020.03.03

2020-03-03View Original

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Multiple-choice question: Two objects, each with a mass of m, are attached to two soft ropes. These ropes are in turn wrapped around two pulleys with radii of r and 2r respectively, and the pulleys are fixed together. The mass of the drum wheel formed by the two circular wheels is also m, and its radius of rotation about axis O is ρo. Of the two objects, one is suspended vertically while the other is placed on a smooth surface. When the system moves under the gravitational force of the left heavy object, the angular acceleration α of the drum wheel is ( ). Answer: A Hint: Extra rewards will be given to those who can explain the solution process; the answer can be seen there!

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