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)

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.