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14.1.6. the center of mass motion of a mechanical system is determined by the radius vector rc = 2cosπti + 2sinπtj. Determine the projection on the y-axis is the principal vector of external forces at time t = 0,5 s, if the mass of the system m = 10 kg.
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(Chapter 3 - Dynamics theme - 14.1: on the movement of the center of mass theorem) of Reshebnik to the collection of short tasks on the theoretical mechanics Kep OE, JA Viba, OP Grapis, JA Svetinysh et al. Publishing Moscow / Graduate School / 1989, 2009, 2012.
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