(a)[3]
The wind moves straight towards the turbine at a speed of $12\,\text{m s}^{-1}$. In 1 second, $60\,000\,\text{kg}$ of air flows through the circular area swept out by the blades. Calculate the kinetic energy of this mass of air.
(b(i))[1]
State one reason why it is important to cut the amount of carbon dioxide produced.
(b(ii))[1]
Suggest one advantage of a coal-fired power station when compared with a wind turbine.
(c(i))[1]
Define what is meant by the kilowatt-hour (kWh).
(c(ii))[1]
Calculate the mass of carbon dioxide saved if the wind turbine has a power output of $2000\,\text{kW}$ and runs for $12$ hours.
(d)[1]
Wind energy is a type of renewable energy. State the name of one other renewable energy source.