Question: when a jet of air 254 cm in diameter strikes...

When a jet of air 2.54 cm in diameter strikes a series of rotors on a turbine rotor, the inlet and outlet velocities are as shown. Assuming that the air has a constant density of 1.2 kg/m3 , compute the force on the rotor, the power transferred to the rotor, and the velocity of the blade system, ωr.