1. A propeller 1 f t in diameter rotates at 1200 rpm in water and absorbs 2 hp. Find the power coefficient, and estimate the power required to increase the speed to 1500 rpm if the power coefficient remains constant.
2. A high-speed two-bladed wind turbine 35 m in diameter operates at its peak effi- ciency in winds of 30 km/hr. Estimate the power generated, the rotor speed, and the wind velocity in the wake.