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Below a discharge from a wasterwater treament plant , an 8.6km stream has a reoxygenation constant of .4 d^-1, a velocity of .15m/s, a dissolved oxygen concentration of 6mg/L, and an ultimate demand of 25mg/L. The stream is 15C, the deoxygenation constant is estimated at .25d^-1. What will be the impact on fish population in the stream
Section 604 of the act lists the phase-out of production of substances that deplete the ozone layer. What is the last year that carbon tetrachloride can be produced
the rigid bar abcd is supported by a pin at B and restrained by identical steel bars at C and D, each of area 250mm^2. if the temperature is increased by 80C, determine the force P that will cause the bar at c to be stress-free.
Why is the anchorage capacity of a standard hook not increased by extending the bar well beyond the end of the hook
A horizontal Curve is designed for a two lane mountainous terrain. The following data are known. intersection angle: 40 degrees tangent length: 436.76 ft Station on PI: 2700+10.65 fs=0.12 e=0.08
The force is applied at the two pins. The pins allow rotation around the z-axis and do not allow rotation around the y-axis. The length of the beam between the pins is 8m. Determine the maximum allowable compressive force that can be applied.
a 4ft-long, 1-in-diameter shaft rotates inside an equally long cylinder that is 1.02 in. in diameter. Calculate the torque required to rotate the inner shaft at 2000 rpm if SAE-30 oil at 70 degrees F fills the gap
Conduct a powder factor design for the following conditions: -Rock is iron ore; density is 5370 lb/cubic yards -Rock swells 60% from in situ when broken -Bench height is 45ft -Drill hole diameter is 12.25 inches
Three parallel rural routes connect two cities A and B. Traffic on these routes mainly consists of heavy trucks for a logging company, and passenger vehicle flow can be neglected. The performance functions of these three routes are
an unconfined compression test was conducted on a cylindrical clay specimen with the following properties: Peak load at failure = 4.5lb, diameter of sample = 1.2 in.
A tensiometer is used to measure a compacted soil in the field that has a matric suction of 200 kPa under atmospheric conditions. The pore-water pressure measurement in the tensiometer reaches
At an angle of α=30°with the vertical, a 5kg sphere is suspended on a string of length .8m with a initial velocity of 1.2m/s, it colides with wedge B. ε=.7 between the .9kg wedge and sphere A.
Testing has already been completed on the water and the Usage Rate for the carbon is 0.4 pounds of carbon per 1000 gallons of water treated. The required EBCT is 20 minutes and the carbon longevity must be at least 6 months.
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