Task 10382.

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Bulb 20 g fastened to weightless thread length l = 50 cm, is rotated in a horizontal plane about a vertical axis with frequency n1 = 2 v / v. To determine the angular velocity and kinetic energy of the ball, if the length of the filament 3 times shortened, thereby bringing the ball to the axis of rotation.

Detailed solution shorthand terms, formulas, laws used in the decision, the withdrawal of the calculation formula and the response.

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