A wind turbine works by slowing the air that passes its blades and converting much of the extracted kinetic energy to electric energy. A large wind turbine has 45 m-radius blades. In typical conditions, 98,000 kg of air moves past the blades every second.
If the air is moving at 13 m/s before it passes the blades and the wind turbine extracts 40% of this kinetic energy, how much energy is extracted every second?