If the incoming wind speed is at 10 m/s, if the axial induction factor is at optimal value please calculate the wind speed right in front of the wind turbine (U2) and wind speed right after the wind turbine (U3) and wind speed in the far wake (U4).

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?