What maximum output would you expect from a wind turbine with a 20 ft diameter blade in a 15 mph wind?

What maximum output would you expect from a wind turbine with a 20 ft
diameter blade in a 15 mph wind?

Why dont we all put a little wind turbine on our roofs to power heaters in the winter?

So would this work, stick a roof top wind turbine on your house and directly plug it into a heater, which would heat your house in the winter?

Will the energy produced by the windmill be enough to power my hospital?

The model of the windmill is
http://windenergy7.com/home–wind/turbine/index.php?product=45

The monthly electricity bill is 428$

I’m planning to buy a windmill for my hospital at economic rates. If more models discovered please suggest the web-site.

Thanks for your time,
Rutvik Bade

Which renewable energy source has the greatest net energy yield?

Which renewable energy source has the greatest net energy yield?
A. Solar Energy
B. Hydroelectric
C. Wind
D. Biomass
E. Hydrogen Fuel
F. Geothermal

And please explain why you picked the answer , for example :

F , Geothermal , this is beacuse …….

Thanks , i need the answer+explaination by tonight .