For central Ohio, pay rates for Spinning instructors varies from around $13/hour to $30/hour.

To stay up in space.

Gravity.

Anything moving has energy. The formula for kinetic energy is energy equals mass times the square of the speed. So yes, spinning turbine blades have energy.

The spinning of the Earth is probably a very minor component in the generation of the winds, although the spinning does distribute the primary power source for the winds, which is the Sun. The Sun's light heats up areas of the Earth, causing updrafts, and since it can't all go up, there are downdrafts to compensate. The changing heat caused by sunlight causes turbulent air flow.

Yes, those are certainly both topics in Physics. What's your question ?