Ariver discharges 4 m3/s into a lake with a volume of 4,000,000 m3. the concentration of arsenic in the river is 1 ppb. an industry discharges 0.5 m3/s with an arsenic concentration of 20 ppb into the lake. the arsenic adheres to clay in the bottom of the lake creating an effective water concentration decay coefficient of 0.1 per day. what is the arsenic concentration leaving the lake?

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature

Which of the following refers to refers to how well the control system responds to sudden changes in the system. a)-transient regulation b)- distributed regulation c)-constant regulation d)-steady-state regulation

Hydraulic fluid with a sg. of 0.78 is flowing through a 1.5 in. i.d. pipe at 58 gal/min. the fluid has an absolute viscosity of 11.8 x 105 lbf-sec/ft2. is the flow laminar, turbulent or within the critical range? give both a numerical reynolds number and a term answer.