The diameter of the 80m high tower of a Vestas V90-2.0 turbine is 3.98m at the base and 2.3m at the nacelle. Assume a constant tower drag coefficient, Cd, given by Cd=21U02ddrag=0.5 where drag is the drag on the tower per m of its height, d is the diameter, and U0 is the hub height wind speed. Estimate a. the total drag on the tower at a wind speed U0=8m/s. Take the density of air in southern Alberta as =1.05kg/m3. b. the rotor thrust for the same conditions. c. the total overturning moment at the tower foundations