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A ground water sample has a pH of 7.5, hardness (due to primarily Ca2+) of 100 mg/L, and an alkalinity of 250 mg/L as CaCO3(s). Is the calcite precipitating or dissolving in the pore water? (Alkalinity = [HCO3-] + 2[CO32-]+[OH-]-[H+])
Determine axial force and Max bending - Question in structure analysis
Calculate the temperatures of the object with the indicated solar albedo and IR emissivity placed out in the sun where solar radiation is 1100 W/m^2. Assume a rectangular shape of length 4 m and width 3m.
The following wind conditions are expected: V = 10 i - 5 j mph for 0 10 hr. Draw to scale the expected streakline of the stream for t = 3, 10, and 15 hr.
Lab studies have shown that the rate constant associated with the process are as follows: k = 0.95 mg COD/mg VSS-day; Y = 0.48 mg VSS/ mg COD, half-saturation K = 85 mg COD/L; ke = 0.07 d-1.
For each of the two cases below, determine the water pressure, pressure head, elevation head, and total head at points A, B, and C. Please solve the problem using: (a) the upper reservoir level as the datum
An obstruction is lodged in a 10-ft wide rectangular channel (n = 0.022) that has a botom slope of 0.005. The depth of the channel just upstream of the obstruction is 5.0 ft. If the flow rate is 325 cfs, what is the channel and flow classification
A submerged surface has an area of 25 square feet, and the resultant force acting on it is 100 pounds, what is the pressure exerted on the surface, in psi
A short 60mm diameter circle bar is made of material for which the maximum safe compressive strees is 80 MPa and the maximum safe shearing strees is 30 MPa.
As a civil engineer you look up in your strength of materials book and find out that the deflection, for a square beam of width, t, and length, L, when subjected to a tensile force, F, is given by: h=FL/(Et2), where E is Young's modulus.
If a car engine is turning at 4000 rpm, the transmission gear ratio is 3:1 and the final drive ratio is 4:1. (a) what is the speed in rpm of the car wheels and (b) the vehicle speed if the tire radius is 8 inches
A town is going to upgrade its primary WWTP to a secondary plant that can meet the effluent standard of 25 mg/L BOD5 and 30 mg/L suspended solids. They have selected a CSTR activated sludge system for the upgrade.
You are designing a highway to AASHTO guidelines on a rolling terrain where the design speed will be 60 mi/h. at one section, a +1.0% grade and a -3.0% grade must be connected with an equal-tangent vertical curve.
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