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1.A sample of dry sand having a unit weight of 105 pcf and a specific gravity of 2.70 is placed outdoors. During a storm, the sample degree of saturation increased to 40% while its total volume did not change. Determine the total unit weight and water content of the sample after being wet.
2.Given the following BOD test results..
Initial DO = 8 mg?L
Final DO = 0 mg?l
Dilution = 1/10
what can you say about
a. BOD5
b. BOD ultimate
c. COD
3.a settling tank has a dimension of 3m deep, 10 m long, and 4 mwide. The flow entering the tank is 10 cubic meters perminute.
a. what is the residence time in this tank
b. what is the velocity of a critical particle in thissettleing tank
Many years ago, well-known architect Frank Lloyd Wright designed a mile-high skyscraper, which has never been built.
To verify the constant of a particular prism, a straight line EFG is laid out. The EDM instrument is first set up at E, with the following measurements recorded: EG = 426.224 m, EF = 277.301 m.
A 100 ft cut steel tape was used to measure between two property markers. The rear surveyor held 93 ft, while the head surveyor cut .67ft. What was the distance between the markers
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.
A jet aircraft is flying in a standard atmosphere at an altitude of 4,000 m at 900 km/hr. The frontal intake area of the jet engine is 0.80 m2. The engine exhaust area is 0.56 m2. The temperature of the exhaust gas is 120°C.
If the specific surface energy for aluminum oxide is 0.90 J/m^2, using data contained, compute the criteical stress required for the propagation of an internal crack of length 0.40 mm.
Assuming constant acceleration, determine how long the train blocked the crossing. Dis- regard the width of the crossing.
A room in a single-story building has three 2.5 x 4 ft double-hung wood windows of average fit that are not weather-stripped. The wind is 23 mph and normal to the wall with negligible pressurization of the room.
a 520 ft long equal tangent crest vertical curve connects tangents that intersect at station 340 00 and elevation 1325 ft the initial grade is if 4 and the final grade is 2.5 determine the elevation and stationing of the high point PVC AND PVT
DISCUSS THE LIMITATION AND PROBLEM OF EXTRAPOLATING MECHANICAL PROPERTIES MEASURED ON A SMALL ROCK SAMPLE TO FIELD SITUATIONS.
The tank has an inside diamater of 100 cm and will be subjected to a maximum internal pressure of 820 kPa. The allowable tensile stress in the wall is 83 MPa, and the allowable tensile stress in the weld is 55 MPa.
Assuming that the velocity variation within the main channel and the floodplain subsections is much smaller than the change in mean velocities between subsections, find the value of the kinetic energy correction coefficient.
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