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Two bridge designs have been proposed for the new interstate highway to cross Detroit Michigan to Windsor, Ontario. A bridge constructed from wood will cost $6000 and will last for eight years. Bridge constructed form steel will cost $11,000 and will last for twenty years. Either bridge will have a zero salvage value at the end of its life. Use an interest rate of 8% and determine whether the increased life of the steel bridge justifies the increased cost.
The wastewater influent has a linear velocity of 0.5m/s and contains 3.0x10^5 fecal coliform colony unit (CFU) per liter. Determine the coliform concentration of the discharge effluent into Back river.
Repeat LEM(Limit Equilibrium Method) analysis in clay (undrained) using a circular failure surface, with the center of the circle a distance h above the edge of the footing. What ratio of h/B gives the minimum value of Nc
For a ternary system, three components are present; temperature is also a variable. What is the maximum number of phases that may be present for a ternary system, assuming that pressure is held constant
A plastic bar fit snugly between rigid supports at room temp. (68)but with no initial stress. When the temperature of a bar israised to 160 F the compressive stress on an inclined plane pqbecomes 1700 psi.
Carbon dioxide flows in a 75 mm diameter PVC pipe at 0.014 kg/s at a pressure of 345 kN/m^2/s abs and a temperature of 10 degrees C. Calculate the head loss in 500 m of pipe.
Suppose we want to estimate the average weight of adult males in greater metropolitan Atlanta area. We draw a random sample of 1,000 men from a population of 1,000,000 men and weigh them.
The beam has an allowable flexural stress of 9 MPa and a much lower allowable shear stress parallel to the grain of 850 kPa. What is the maximum that each of these 2 equal loads can be
The point of dicharge is 5 m abovethe floor, and friction losses in the 50 mm pipe from the resevoirto the tower amount to 2.5 J/kg. At what height in the resevoirmust the water level be kept if the pump can deliver only 0.1kW
The maximum eight-hour average concentration of carbon monoxide (CO) in an urban area is measured to be 17 ppm. The NAAQS is 9 ppmv (equivalent to 10.3 mg/m^3 estimated at P = 1 atm and T=298.25°K).
A hydraulic transition 100 ft long is used to connect two rectangular channels, 12ft and 6ft wide. The design discharge is 500 cfs, mannining coefficient=.013 and the slopes of the channels are both .0009.
Define flow at a hydraulic jump (upstream and downstream) in terms of the types of flow and corresponding Froude number. What is the depth of water at each section (upstream and downstream) compared to critical depth
Water under a gage pressure of 65 psi flows with a velocity of 12.5fps through a right-angled bend that has a uniform diameter of10in. The bend lies in a horizontal plane
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