Задача 10683.

Disc 1 kg and a diameter of 0.6 m rotates around an axis through the center and perpendicular to its plane, making about 20 / sec. What kind of work have to do to stop the disc?

A detailed solution with a brief note of the condition, formulas and laws used in the solution, the derivation of the calculation formula and the answer.
If you have any questions about the solution, write. I try to help.