If air velocity at 21.1 m/s is desired, what is the expected difference between stagnation and static pressure read by a water manometer in inches H2O at this air velocity if the air pressure is 100 kPa and 20 Celsius?

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?