The town of Pittsburg discharges 0.126 m3 /s of treated wastewater into Cherry Creek. The BOD5 of the wastewater is 34 mg/L. Cherry creek has a flow rate of 0.126 m3 /s. The BOD5 of the river before the wastewater outfall is 1.2 mg/L. The BOD rate constants are 0.222 and 0.090 d-1 for the wastewater and creek respectively. The temperature of the creek and wastewater is 20 C. Calculate the initial ultimate BOD after mixing. (Problem 7-24 from textbook)

Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg.k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m.k