Engineering, 22.02.2020 00:54 gtemple22pdzs4j
Assume a factory releases a continuous flow of wastewater into a local stream, resulting in an in-stream carcinogen concentration of 0.72 mg/L just below the outfall. Suppose this carcinogen has an oral potency factor of 0.45 (mg/kg-day)-1 and that it is degradable with a reaction rate coefficient k of 0.23/day. To keep the problem simple, assume that the stream is uniform in cross section, flowing at the rate of 2 mph, and that there is no other sources or sinks for this carcinogen. At a distance of 150 miles downstream, a town uses this stream as is only source of water. Estimate the individual residential lifetime cancer risk caused by drinking this water.
Answers: 1
Engineering, 04.07.2019 18:10
Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.
Answers: 2
Engineering, 04.07.2019 18:10
Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2
Answers: 3
Engineering, 04.07.2019 18:10
Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way
Answers: 2
Engineering, 04.07.2019 18:20
Derive the correction factor formula for conical nozzle i=-(1+ cosa) and calculate the nozzle angle correction factor for a nozzle whose divergence hal-fangle is 13 (hint: assume that all the mass flow originates at the apex of the cone.
Answers: 3
Assume a factory releases a continuous flow of wastewater into a local stream, resulting in an in-st...
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