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Two rigidly connected homogeneous rods o...

Two rigidly connected homogeneous rods of the same length and mass `m_(1)` and `m_(2)` respectively form an angle `pi//2` and rest on a rough horizontal surface (Fig.) The system is uniformly pulled with the help of a string fixed to the vertex of the angle and parallel to the surface. Determine the angle `alpha` formed by the string and the rod of mass `m_(1)`.

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