Question 2 (15+10+10=35) a) A large wind turbine has blades 50 m long. In Northern UAE's winds of 20 m/s, calculate the rotational rate if the blade tips were to equal the speed of sound (340 m/s). b) What would be the tip speed ratio if hurricane-force wind of 40 m/s blows over the hills? Compare your results with the figure on Slide#35 and identify which turbine would best work under this condition? c) Can a turbine rotation really reach supersonic speed? What is the usual cut-out speed for wind turbines (cut-out speed is the speed of air at which the turbine would shut down)? Activate Wi