Problem 4.
A small wind turbine is producing electricity operating with an 11 m/s wind with a density of 1.2 kg/m^3. Assume the diameter of the wind turbine is 4 m. If pressure is atmospheric everywhere, what is the force on the turbine in the horizontal direction? Assume the incoming flow at 3 m diameter will result in a 4.5 m diameter downstream. Assume uniform velocity in every cross-section.
Don't forget the figure!