15.6.1. Uniform disc radius of 0.4 m can be rotated about a horizontal axis perpendicular to the plane of the disk and passing through its rim. What initial angular velocity is necessary to inform the drive that he turned a quarter turn?

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(Chapter 3 - Dynamics theme - 15.6 Theorem of the kinetic energy of a solid change) 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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