Determine the moment of force M, which must be applied to the block rotating at a frequency of 12 c^-1, so that it stops within the time t = 8 s. Block diameter D = 30 cm, block mass m = 6 kg is considered uniformly distributed over the rim.

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.