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A wastewater treatment plant must disinfect its effluent before discharging the wastewater to a near-by stream. The wastewater contains 4.5*105 fecal coliform colony-forming units (CFU) per liter. The maximum permissable fecal coliform concentration that may be discharged is 2,000 fecal coliform CFU/L. It is proposed that a pipe carrying the wastewater be used for disinfection process. Determine the length of pipe required if the linear velocity of the wastewater in the pipe is 0.75 m/sec. Assume that the pipe behaves as a steady-state plug-flow system and that the reaction rate constant for destruction of the fecal coliforms is 0.23 min-1.
Find the maximum shearing stress and its location in the shaft and the angle of twist of A with respect to C. Let G = 4x10^6 psi for the entire shaft.
A vertical curve of 600 ft in length is used to connect two tangents with the following locations: Tangent 1.- Point 1, Sta = 59+00, El = 1250.0' Point 2, Sta = 72+00, El = 1190.0' Tangent 2.- Point 1, Sta = 72+00, El = 1190.0' Point 2, Sta = 84+0..
Briefly explain the purpose of the International Space Station, and list the name of all space agencies involved in building and operating it.
Evaluate company performance in relation to GRI standards and comment on Stigler's theory.
A surveyor measures an angle with two instruments; call them A and B. Both instruments produced unbiased measurements, but the standard deviation of measurements made with instrument A is twice that of B.
A rectangular beam 4 inches wide and 12 inches height must sustain a maximum bending stress of 12,500 Lbs/in^2. A) Sketch beam and show neutral axis. B) Solve for the maximum bending moment.
A computer CPU chip consists of 50 g silicon,20g copper, and 50 g polyvinyl chloride (plastic). It heats from 15?C to 75?C as the computer is turned on. How much did the entropy increase
Two ships A and B are moving with constant speeds Va and Vb along straight intersecting courses. The navigator of ship B notes the time rates fo change of the separation distance r between the ships and the bearing angle theta.
Determine the maximum service load W (kips) at the mid-height of the beam-column shown in the accompanying figure 2.1. Assume the member is hinged with respect to bending in both x and y directions at the top and bottom.
Determine the percent error n in replacing the sine and the tangent of an angle by the value of the angle in radians for angle values 5 degrees, 10 degrees, and 20 degrees. Explain the qualitative difference between the sine and tangent results
A hydroelectricity plant is supplied from a resevoir via a pipeline 2km long and 2.5m in diameter. The pipeline terminates at the downstream end at in a control valve. Determine the minimum surge tank size if the max allowable height
Assess the adequacy of this existing curve in light of the reconstruction design speed of 60 mi/h and, if the existing curve is inadequate, compute a satisfactory curve length.
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