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Two touching bars 1 and 2 are placed on ...

Two touching bars 1 and 2 are placed on an inclined plane forming an angle `alpha` with the horizontal (figure). The masses of the bars are equal to `m_1` and `m_2`, and the coefficients of friction between the inclined plane and these bars are equal to `k_1` and `k_2` respectively, with `k_1gtk_2`. Find:
(a) the force of interaction of the bars in the process of motion,
(b) the minimum value of the angle `alpha` at which at bars start sliding down.

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