Does Rotational Kinetic Energy Differ for Objects Like Fans in the Air?

[kmikias]

Hi I have some question on rotational kenitic energy.here is my question

If something rolling motion the total kinetic energy is the translation kinetic energy and the rotational kinetic
Energy.where I am confuse is what if something rotating in the air like a fan,air conditioner
What would be the kinetic energy would that be 1/2Iw^2...for circle.

 

[LowlyPion]

Your fan blades would have rotational kinetic energy only if the fan is at rest.

And yes that would be ½Iω².

Determining the moment of inertia would be your only problem depending on the shape of the blade.