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A diffuser discharges wastewater into a slow-moving river that has a mean velocity of 3 cm/sec. After initial mixing, the DO concentration in the river is 9.5mg/L and the temperature is 15ºC. If the ultimate BOD of the mixed river water is 30mg/L, the rate constant for BOD at 20ºC is 0.6d-1, the reaeration rate constant at 20ºC is 0.8d-1, and the removal of BOD by sedimentation can be neglected, estimate the minimum DO and the critical location in the river.
The cost for maufacturing a component used in intelligent interface converters was $23000 the first year. The company expects the cost to increase by 2% each year. Calculate the presence worth over a 5 year period at an interest rate of 10% per ye..
What is the smallest particle size (density 2.65 g/cm3) that will be removed in a horizontal grit chamber 10 m long and 1.0 m deep if the flow rate is 1000 m3/hr. Assume the temperature of the water is 25°C.
determine the value of Po, as a funciton of H, for these two investment alternatives to be equivalent at an interest rate of i=15% per year.
A 1 m diameter unfinished concrete pipe (n = 0.015) has a slope of So = 0.001 and conveys water at Q = 0.5 m3/s. Find the normal depth yo and critical depth yc.
a spot speed study was conducted on a freeway on which the mean speed and the standard deviation were found to be 72 .4 mi/hr and 5.4 mi/hr, respectively. what is the range of the values that would be expected to contain the middle 95 percent of s..
A Ferris wheel with a radius of 35 feet starts from rest and undergoes an angular acceleration of 0.05 rad/s^2. Compute the magnitude of the velocity and acceleration vectors at 5 seconds for a point on the rim of the Ferris wheel.
It was observed that the truck traveled a distance of 120 ft after the brake was engaged before coming to a complete stop. If instead the driver brings the truck to a velocity of 90 mph and completely engages the brake
Discuss the different agencies, institutes, centers, different environmental companies that are active in UAE.
The proposed highway has two tangents of bearings N 45Degrees 54' 36" E and N 1 Degree 22' 30" W. The highway design engineer, attempting to obtain the best fit for the simple circular curve join these tangents, decides that the external is to be ..
An Electrostatic Precipitator must treat 500,000 acfm with 99% efficiency. Assuming an effective drift velocity of 0.4 ft/sec, calculate the required plate area in ft^2, and the number of plates if each is 20 ft tall by 10 ft long, and there are 4..
The 5-m long cantilever beam using a W410 x 67 standard wide flange section has a distributed load of 1200 N/m placed on it. It is also supported by a cable at B, of length 2 m with a 7 mm2 cross sectional area. What is the force in the wire
The bar is 1m long and its weight, W, acts at its midpoint. The angle is a=30 degrees, and the the spring constant k= 100N/m. The spring in its current position is 1.52m long, and its unstretched length of 1.25 m occurs when the bar is vertical a=..
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