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7-39. A thin uniform rod of mass m and length / is balanced vertically on a horizontal surface. An infinitesimal disturbance causes it to fall.

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7-39. A thin uniform rod of mass m and length / is balanced vertically on a horizontal surface. An infinitesimal disturbance causes it to fall. (a) Find the coefficient of friction u if the rod makes an angle @ = 30 with the vertical at the moment when slipping begins. (b) Find the range in 6 over which it is impossible for slipping to begin, regardless of the value of the coefficient of friction

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