17.3.20. The crown gear has a mass m = 30 kg, the radius of gyration ρ = 0,25 m, a pitch circle radius R = 0,3 m, a radius r = 0,15 m. Determine a spring force F when angular acceleration of the crown ε = 40 rad / s2, and the force engaged F = 800 N. The springs are the same.

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(DYNAMICS, Chapter 17 - The principle of D'Alembert, paragraph - 17.3: kientostatiki method for solid state and mechanical system) from 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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