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1. An industry discharges 0.5 m3/s of a waste with a 5-day CBOD of 500 mg/L to a river with a flow of 2 m3/s and a 5-day CBOD of 2 mg/L Calculate the 5-day CBOD of the river after mixing with the waste.
2. A waste having an ultimate CBOD of 1,000 mg/L is discharged to a river at a rate of 2 m3/s. The river has an ultimate CBOD of 10 mg/L and is flowing at a rate of 8 m3/s. Assuming a reaction-rate coefficient of 0.1/day, calculate the ultimate and 5-day CBOD of the waste at the point of dis-charge (0 km) and 20 km downstream. The river is flowing at a velocity of 10 km/day.
Find the angular velocity and angular acceleration needed to keep the prisoner in the beam of the spot light at the moment when the prisoner is 4000 ft away from the spot light.
How accurately would each 100-ft distance have to be measured so that the 95% error would no exceeded +-0.24ft in a total distance of 4000ft
Water is pumped 9 mi from a reservoir at elevation 100 ft to a second reservoir at elevation 210 ft. The pipeline connecting the reservoirs has a 54-in diameter. It is concrete and has an absolute roughness of 0.003.
Using Buckingham-Pi method, derive a relationship to evaluate the discharge, Q, over a rectangular notch as a function of the width of notch, b, acceleration due to gravity, g, fluid density
A corporation issues a new 10 year bond that has a coupon rate of 4.65% with quarterly dividend payments. Alex purchases 200 of these bonds at a price of $98.75, for a total investment of $19,750. Assuming he holds them to maturity, what will be..
A moist soil sample weighing 22.2 N has a moisture content of 20%. How man N of water must be added to the sample to increase the moisture content to 30%
Assume a collision occurs at 10:30 PM on the westbound of a 4-lane bridge (2-lane in each direction) blocking the entire roadway. When the accident happens, the traffic volume is around 1200 veh/hr. Emergency crew responded quickly to open 1 lane wit..
Assume the collector provides this energy to a thermal storage unit (a thermal reservoir) at 220oC. A heat engine receives energy from this thermal storage unit and discharges energy by heat transfer to the surroundings at 20 C
Conduct either a qualitative or quantitative risk assessment on this project. Identify the risk factors that you consider most important for the suspension bridge construction. How would you assess the riskiness of the project? Why?
Water at 1000 kPa, 250?C is brought to saturated vapor in a piston/cylinder with an isothermal process. Find the specific work and heat transfer. Estimate the specific work from the area in the P-v diagram and compare it to the correct value.
What are the requirements to become a surveyor in Texas? 3 pages
For the cantilever beam shown the depth is h at the support. Find the required depth y as a function of the length x in order for all sections to be equally effective in their resistance to bending
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