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Newton's Laws for System of Particles

15 There is a...

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15 There is a uniform rod of mass m and lengthlhaving particles A of mass m and B of mass 3mattached at its end. The rod is hinged at a point sothat it can turn in a vertical plane about ahorizontal axis. Distance of hinge from particle A,so that angular acceleration of system is minimumwhen released from horizontal position is

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