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A wastewater treatment plant discharges 1E-5 m^3/day of treated waste to a river. Immediately upstream of the plant, the ultimate CBOD is 2 mg/L and the flow is 9E5 m^3/day. At a distance of 20 km downstream of the plant, the river has an ultimate CBOD of 10 mg/L. The state has set an ultimate CBOD discharge limit for the treatment plant of 2000 kg/day. The river has a velocity of 20km/day. The CBOD decay coefficient is .1/day. Is the plant in violation of the discharge limit?
What is the pH of the solution created by combining 0.90 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)?
QZY, Inc. is evaluating new widget machinesoffered by three companies. The machines have the following characteristics: A B C First cost $15,000 $25,000 $20,000 Maintenance and operating 1,600 400 900
A two post in ground car lift uses compressed air to force water under two aluminum pistons that move in unison (both pistons at same elevation) to raise and lower the vehicles.
The concentration of Chemical Oxygen Demand (COD) in the effluent from this system is 25 mg L-1. The growth rate of the organisms in this case is 0.9 days-1. The activated sludge tank has a volume of 50 m3 and the flow rate through it is 500 m3 da..
A crane is placed along the easterly sideline of a building, but 25 feet from the front of the building. The building to be erected is a 6 story building that is 100 feet wide by 50feet deep. YOu may assume that each story is 15 feet.
The air pressure is 120 KPa, the air temperatuer is 28 degrees C, and the dew point is 20 degrees C. Calculate the corresponding vapor pressure (ea) and relative humidity (RH). Assume Atmospheric pressure is 101,000 Pa.
how far back from the front axle would the center of gravity have to be to ensure that the maximum tractive effort developed for front- and rear- wheel-drive options is equal (assume that all other variables are unchanged)
Could all the people in china hold back the water behind the three gorges dam?
A 12.0 m rectangular channel, having a bed slope of 50 cm/km and a Manning roughness coefficient of 0.015, conveys water at a normal depth of 1.0 m. A dam is built across the channel at which the water depth is 2.0 m.
The fluids do not mix and the atmospheric pressure is 1.01 x 105 N/m2. Determine the gauge pressure head and the absolute pressure head in metres of water at i depth of 6.6m below the free surface.
A fully enclosed cylindrical fuel tank with a diameter of 6.00 meters and a height of 8.00 meters has a manufacturing tolerance of +/- 0.04 meteres for each of these dimensions.
Modeling the skydiver as a particle and assuming that the skydiver follows a perfectly vertical trajectory, determine the average force exerted by the parachute from the moment of deployment until landing.
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