17.1.22. The material point M is the mass of m = 4 kg is moving according to the law s = 0,5t2 + 0,5sin4t. At time t = 5, the radius of curvature of the trajectory of ρ = 4 m. Determine the time in the inertia force modulus of the material point.

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(DYNAMICS, Chapter 17 - The principle of D'Alembert, 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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