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The block of weight W = 100 lb is suspended by two springs each of stiffness k = 200 lb/ft and is acted upon by the force F = 75 cos 15t lb where t is the time in seconds. Determine the amplitude X of the steady-state motion if the viscous damping coeffi- cient c is (a) 0 and (b) 60 lb-sec/ft Compare these amplitudes to the static spring deflection δst.
A multinational engineering consulting firm that wants to provide resort accommodations to certain clients is considering the purchase of a three-bedroom lodge in upper Montana that will cost $250,000. The property in that area is rapidly appreciatin..
The cash flow associated with landscaping and maintaining a certain monument in Washington, D.C., is $100,000 now and $50,000 every 5 years forever. Determine its perpetual equivalent annual worth
Develop a simple urban constructed wetland design guidelines and drawings. Your report should include the following:I. Data required for the design II. Types of constructed wetlands III. Components of a constructed wetland
The Fluoride feeder runs out of feed solution. The rapid mix tank is connected to a 5 km long distribution pipe. The flow rate into the tank mix tank is 0.44 m?/s and the volume of the tank is 2.50 m?.
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.
groundwater is pumped for domestic use from an unconfined aquifer. the thickness of the clay is 40%. after 10 years of pumping, the porosity is reduced to 30%. determine the subsidence of the clay surface.
5,000 gpd of primary sludge at 5% solids (50,000 mg/l) and 5,000 gpd of biological treatment sludge (10,000 mg/l) are blended, then thickened to 8% solids. What volume of supernatant is returned to the reactor
A pumped storage power plant is to be designed for a flow rate of 6,000 cfs per penstock. The penstocks are 20 ft. in diameter, with a relative roughness of 0.008. The elevation difference between the two reservoirs is 340 ft.
The city of Lancaster's water distribution system has 3 wells for water supply. There are 10 pumps at these wells. It is estimated that a pumping rate of 10,000 gallons per minute is needed to satisfy the city's total water demand.
What is the effective stress 25 feet deep if the specific weight of the dry soil (dry unit weight) is 120 pcf and the water table is 12 feet deep
The fluid pressure in the screen of a piezometer in a saline aquifer is 7.688 x 10^5 N/m^2. The fluid density is 1055 kg/m^3 and the temperature is 14 degrees C. The elevation of the piezometer screen is 45.9 m above sea level.
Two 1/2 inch rods are spliced together by glueing a 2 inch section of plastic pipe over the rods ends. If a tensile force P = 350 lb is applied to the spliced nylon rod, what is the average chear stress in the glue joint between pipe and the rods?
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