Extracting the rotational energy of a black hole would be more complicated, but still theoretically possible. In his 1969 article, Penrose described a mechanism that could directly utilize ...

Black holes are a drag. The energy that Penrose and now Pinochet suggest could theoretically be extracted from black holes is the kinetic energy that keeps them rotating.

For the rotation of the object (about the center of mass), there is rotational kinetic energy. It has the form: Here, I is commonly called the moment of inertia.

The application, filed for in June 2011, notes that most contemporary wind turbines convert kinetic energy from wind into mechanical energy, or in some cases electricity.

Kinetic energy and joints. Pin joint connection. ... Therefore, the initial potential energy of the system goes into rotational KE for the bar and both translational + rotational KE for the disk.

If we use the rotational energy of the Earth, it would spin at a slower rate. I will start off assuming we make the day 1 second longer. Currently, the Earth takes 23.9345 hours to rotate.