61. The platform as a disc of radius R = 1 m coasts at a frequency n1 = 6 min-1. On the edge of the platform is a person, the mass m is equal to 80 kg. N How often will rotate the platform, if a person goes into its center? Moment of inertia J platform is 120 kg · m2. Moment of inertia of the human count for a material point.

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