79. The fan rotates at n = 600 r / min. After he began to spin off ravnozamedlenno and making N = 50 turns, I stopped. Work A braking force is equal to 31.4 J. Define: 1) torque M braking; 2) the moment of inertia J of the fan.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)