The ball attached to a weightless thread is rotated in

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The ball attached to a weightless thread is rotated in a horizontal plane about a vertical axis. Determining how many times to increase the number of revolutions per unit time of the ball and its kinetic energy by decreasing the length of thread twice thereby bringing the ball to the axis of rotation.

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Task 10874. Detailed solution shorthand terms, formulas and laws used in the decision, the withdrawal of the calculation formula and the response.
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