Inside the tube smooth, curved along radius R = 2 m circle in a horizontal plane moves from rest mass of the material point m = 42 kg under the force F = 21 N. determine a horizontal component at time t = reaction tube 7, if the direction force coincides with the velocity vector.

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(Chapter 3 - Dynamics theme - 13.1: Defining the parameters of curvilinear motion by the given forces) from 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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