The blades of a wind turbine sweep out an area of $2000\,\text{m}^2$. It changes the power in the wind into electrical power with an efficiency of $50\%$. How much electrical power is produced when the wind speed is $10\,\text{m s}^{-1}$? (The density of air is $1.3\,\text{kg m}^{-3}$.)
- A$130\,\text{kW}$
- B$650\,\text{kW}$
- C$1300\,\text{kW}$
- D$2600\,\text{kW}$