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There are three reactors degrading a chemical biologically, at three degradation rates; i.e., 0.2 d^-1, 0.4 d^-1, and 1.0 d^-1. The residence time of the chemical in these reactors are 10 d, 5 d, an
Chemical ‘A' is regulated by EPA and the maximum allowable concentration in water is 5 ?g/L. Design a reactor for a water treatment plant where 1000 ppm of chemical ‘A' is introduced at
The stream has a naturally occurring NaCl concentration of 20 mg/L. If the storm sewer flow rate is 2000 L/min and the stream flow is 2.0 m^3/s, what is the concentration of salt in the stream after
At a temperature of 60 F, a .04 in gap exists between the ends of the two bars. Bar 1 is an aluminum alloy [E=10,000ksi, v=.32, alpha=12.5x10^-6/F] bar with a width of 3 in and a thickness of .75 in
Two level sections of an east-west highway (G = 0) are to be connected. Currently, the two sections of highway are separated by a 4000-ft (horizontal distance), 2 % grade. The westernmost section of
If the maximum (total) depth of water that can be accommodated at the weir is 1m and the width of the channel is 4m, determine the crest height of a suppressed weir that should be used to measure th
Knowing that the modulus of rigidity is 77 GPa for the steel and 27 GPa for the aluminum, determine the largest angle through which end A can be rotated if the following allowable stresses are not b
From historical cost records, the capacity ratio exponent of a process unit is 0.5. Use the capacity ratios raised to an exponent method to determine the estimated cost of a similar process unit wit
To avoid the salinization of soil in a farming area, parallel drainage canals are to be installed to maintain the water table at a depth of at least 4m below the ground surface. It is thought that n
In a water table aquifer bounded on the ends by rivers, the hydraulic conductivity is 50 m/day. The hydraulic heads at x = 0 and x = 1000 m are 100 m and 90 m, respectively.
A canal was constructed running parallel to a river 1500 ft away. Both fully penetrate a sand aquifer with a hydraulic conductivity of 1.2 ft/d. The area is subject to rainfall of 1.8 ft/y and evapo
The storativity of the Jordan Aquifer (a regional confined aquifer) is 5 x 10-4 and the porosity is 0.3. The thickness of the aquifer is 200 ft. The Jordan has been pumped for several decades, yet r
The water content in one of five standard Proctor test samples is 15.2%. The corresponding degree of saturation is 85%. Calculate the dry unit weight if Gs=2.67
The coordinates for station A are 1023.34 N and 988.56 E. What are the northing and easting coordinates for station B that is located 40 feet due east of A, and 22.32 feet due south of A
The trapezoidal channel has a slope of .004. The sides of the canal are sealed with a plastic membrane, which is protected by a 1 ft thick layer of 1 in diameter gravel. The bottom is a 6 in slab of
The 81-lb uniform square plate is supported by a ball-and-socket joint at O, a cable at E, a fixture at A which can support vertical force only, and a linear spring at C. If the unstretched length o
The modules of elasticity of the wood is 12 GPa. If one side of the column is 25 cm across, find the minimum dimension of the other side to keep the column's deformation under 1.3 mm.
A 4-cm- diameter rod of aluminum 7075-T6 is to subjected to an axial tensile force such that the factor of safety based on the yield stress on 1.75. Find the maximum allowable tensile force.
The flat circular disk rotates about a vertical axis through O with a slowly increasing angular velocity. Prior to rotation, each of the 0.60-kg sliding blocks has the position x = 29 mm with no for
The bottom of a rectangular flume is 5 m above reference level. The depth of the water in the flume is 3 m. The average velocity is 1.7 m/s. What is the total hydraulic energy at the surface of the
The velocity distribution for the flow of oil (SAE 20W) at 150 degrees between two plates is given by y(y-4) mm/s, where y is measured in mm and the space between the plates is 4mm. Determine the sh
a 150 kg mass is suspended by wires from two hooks. the lengths of the wires have been adjusted so that the wires are each 50º from horizontal. assume that the mass of the wires is negligible.
A 200-kg mass is hanging from a hook conncted to a pulley. The chord around the pulley is connected ot the overhead support at two points. What is the tension in each cord connected to the support i
While washing up Grandma's old aluminum cooking pot I noticed that it would just barely touch the bottom of the sink if I added 2.5 cups of water to it. The pot is 3.5 in high and 9.5 in diameter. T
1. Describe why materials such as aluminum, steel, basswood, and Polystyrene Plastic and structures are important in our everyday lives. 2.Write a paragraph to explain to a lay person a few of the im