17.1.14. The material point mass m = 0,1 kg slides on a non-smooth, vertically disposed guide radius r = 0,4 m. In the lowest position of the point v = velocity of 4 m / s, while the tangential acceleration aτ = 7 m / s2. Determine the instantaneous value of the force F, if the coefficient of friction f = 0,1.

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(DYNAMICS, Chapter 17 - paragraph - 17.1: kinetochtatiki method for a material point) 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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