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The concentration of BOD (an indicator of organic pollution) in a river just downstream of a sewage-treatment plant effluent pipe is 75 mg/L-1 . If the BOD is destroyed through a first-order reaction with rate constant equal to 0.05/day-1 , what is the ROD concentration 50 km downstream? The velocity of the river is 15 km/day-1 .
A tow truck is using a cable to pull a car up a 15 degree hill. If the car weighs 4000 lbs and the cable has a diameter of .75 inches, find the stress in the cable when the truck comes to a stop while on the hill.
When stationary, vehicles are spaced at average distance headway of 6 m. It may be assumed that there is a linear relationship between speed and density. When the traffic flow approaching the roadworks is 3500 vehicles per hour
what size galvanized iron pipe (e=0.0005ft) is required to carry a flow of 5 cfs of water at 60 degrees F (v=1.217X10^-5) without exceeding a head loss of 5.0 ft/100ft of pipe
A 6.6 mA current is flowing through a 47 kilo-Ohm, 5% tolerance, 2-watt resistor. If the resistor values are uniformly distributed, how many resistors out of a package of 100 would you expect to burn up
A vertical crest curve has an approach grade +6% and a departure grade -6%. The Vertical intersection point level is 125 m. It is proposed to use a curve 720 m long. Calculate the level at TPl.
The system shown consists of a member which is built in to rigidfoundations at both ends. It is unstrained in the horizontalposition. But then it is put in an upright position, and hence issubject to gravity. Find the stress and strain as a function ..
If the time required to pay for parking is exponentially distributed with a mean of 15 seconds, find the average time in system.
1.explain how the desert air can contain much more h2o vapor in the air than the pole and still a lower humidity than
A rectangular channel has a bottomwidth = b and flow depth = y. Prove that for a given area, the mostefficient rectangular cross section is one with y = b/2.
On a spreadsheet plot the concentration of waste (C) as a function of time in days considering that t = 0 corresponds to the time when the input concentration increases to 1500 mg/L.
write a c++ code for two classes one being automobile and one being motorcycle both being the base class then at least one derived class from each
task 1you have been asked by your construction director to provide a prediction of short term sales growth for your
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