Determine the moment of force that must be applied to a block rotating at a frequency of 12 s ^ -1 so that it stops within a time of 8 s. The block diameter is 30 cm. The mass of the block 6 kg is considered to be uniformly distributed over the rim.

A detailed solution with a brief note of the conditions, formulas and laws used in the solution, the derivation of the calculation formula and the answer.