20.2.1. The potential energy of a mechanical system P = 15φ2, where φ - in rad. Determine the generalized force corresponding to the generalized coordinate φ at a time when the angle = 90 °.
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(DYNAMICS, Chapter 20 - Lagrange equation of the second kind, paragraph - 20.2: Generalized power systems with one degree of freedom) 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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