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A plastic to be used for a torsional snap fit is known to yield under a tensile stress of 8 ksi. Determine the allowable rotation of the tabs, if the snap fit is not to yield. The twisting member has a diameter of 0.3 in. and the tabs are 1 in. away from each of the fixed ends. (Take G = 150 ksi.)
A small town produces 0.15 MGD of wastewater. How many acres in size would an aerated lagoon need to be to treat this wastewater assuming a depth of 8 ft. and a detention time of 6 days? (7.48 gal/ft^3 ; 43,560 ft^2/acre)
Will crack widths be affected by the air entrainment?
A reservoir has a capacity of 2.75 million acre-ft. How many years would this supply a city of 100,000 people if evaporation is neglected. Assume a use rate of 180 gpcd.
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 the p, of the sod solids is 2700 kg/m', what is the dry density and degree of saturation of the fill?
The Three Gorges Dam in China will be the world's biggest when complete. When did the construction start
You plan to use a tank of total volume V= 10 m3 to remove a contaminant at concentration Cin = 1 g/m3 from a waste stream with a flow rate of Q = 1 m3/h. The reaction is first order with a rate constant k1 = 0.5 h-1.
design a three story office buildingassume separate business functions on each floor only top floor allowed full
The town of Obfisquitory wishes to use 4 equal volumes of CFSTR's in series to disinfect 2 million gallons per day (mgd) of water containing 1000 coliforms/L to the maximum required concentration (MCL) of 1 coliform/L.
In an irrigation system sometimes water must be pumped over long distances. Consider a system that consistes of a 1 m diameter, 2 km long commercial steel pipe, which connects a river to an irrigation canal.
A nylon thread is to be subjected to a 10-N tension. Knowing that E=3.2 GPa, that the maximum allowable normal stress is 40 MPA, and that the length of the thread must not increase by more than 1%, determine the required diameter of the thread.
In all but a very few vehicles today crush or crumple zones are employed as a method to reduce energy transfer to the occupants in a crash. For the most part crumple zones form a structural part of the car such as frontal rail or rear bumper beam..
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