Q1 (25 pts): Wind turbines having a tower height of 40 meters will be installed at a certain site. There is no wind speed measurement at the site but the roughness coefficient z is known to be 0.28 . Calculate the mean wind speed at the site (for h=40m ) by using the data given in a wind map. According to the map the average wind speed for that site is 9m/sec. Wind maps are drawn for a height of 10m and z0=0.03. Effect of surface roughness becomes negligible for heights higher than 60m. U(h)=U(hsed)ln(z0hvof)ln(z0h)