Water at 15 °c (pe 999.1 kg/m"), and ρ=1.138 x 10-3 kg/m s) is flowing steadily in 30 m-long and 5 cm diameter horizontal pipe (ε= 2 x 10-6 m) at a rate of 9 l/s. determine: (i)-the pressure drop. (ii)-the head loss.

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?