1. Use the Bernoulli equation and show that, for a wind turbine, the wind velocity is the arithmetic

1. Use the Bernoulli equation and show that, for a wind
turbine, the wind velocity is the arithmetic average of the velocity upstream
and downstream of the propeller.

2. Wind is approaching a wind turbine at 27 mph, as shown in
Figure VIc.5.3. The wake wind has a velocity of 15 mph. Find a) the wind
velocity at the blade and b) the corresponding power extracted by the turbine.