A wastewater plant discharges 3 MGD of effluent with a dissolved oxygen concentration of 0.5 mg/L into a chloride-free river flowing at 50 cfs. Upstream of the wastewater treatment plant outfall, the river is saturated with oxygen an at a temperature of 46.4 Fahrenheit degrees (8 Celsius degrees). What is most nearly the dissolved oxygen deficit (in mg/L) in the river just downstream of the outfall caused by the wastewater treatment plant discharge?

An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet

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?

The characteristic roots of a dynamic system are: 1.7920 1.8160 i, -1.7920 1.8160 i, -0.4160 what is the order of this system? what are the settling time and damping ratio of the system?