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A layer of sand extends from ground level to a depth of 11m and overlies a layer of clay, of very low permeability, 8m thick. The water table is 7m below the surface of the sand. The saturated unit weight of the sand is 19kN/m3 and that of the clay 20kN/m3; the unit weight of the sand above the water table is 16kN/m3. Over a short period of time the water table rises of 3m and is expected to remain permanently at this new level. Determine the effective vertical stress at depths of 8m and 12m below ground level (a) immediately after the rise of water table and (b) several years after the rise of the water table.
at a railroad crossing, an overpass must be built centered over the tracks at a height of 24ft and be 200ft long. the existing highway has a design speed of 50mi/hr.
Calculate expected error L if a theodolite has direct angular accuracy of 10" and a distance of 1500m was measured.
After moving the bubble four divisions off center, the reading is 1.410 m. For 2-mm vial divisions, what is (a) the vial radius of curvature in meters and (b) the angle in seconds subtended by one division
Consider two alternative water resource projects, A and B. Project A will cost $2,533,000 and will return $1,000,000 at the end of 5 years and $4,000,000 at the end of 10 years.
Two wooden members joined by a simple scarf splice and its diagram. The maximum allowable tensile stress in the splice is 75 psi. Determine the largest load P that can be supported and the corresponding shearing stress in the splice.
a). Determine the state of stresses in the walls and indicate these stresses (including arrows to denote the direction of the stresses) on the element below. b). Then, determine the maximum in-plane shear stress on the wall of the pipe using Mohr's..
A ladder is supported by a horizontal floor and a vertical wall. Is 15 feet long and weighs 50 lbs, with the weight concentrated at its midlength. The ladder supports a person weighing 180 lbs.
A 4x4 carries an axial compressive force caused by dead, love, and roof live loads. Lumber is No. 1 Douglas Fir-Larch. Cm = 1.0 , Ct = 1.0, Ci = 1.0. The unbraced length of the member is 12 ft.
A present sum of $50,000 at an interest rate of 12% per year compounded quarterly is equivalant to how much money 8 years ago
The acceleration of point A is defined by the relation a = -1.08sin kt - 1.44 cos kt, where a and t are expressed in m/s^2 and seconds, respectively, and k = 3 rad/s. knowing that x = 0.16 m and v = 0.36 m/s when t = 0
A thin-walled circular tube has an average diameter of 100 mm and a wall thickness of 4 mm. It is subject to torque of 4 kNm and a compressive axial force of 40 kN.
Develop the mass balance equation and solve for the deficit concentration as a function of x, u, Lo, Do, ka, kd,and ks in the stream. Lo ans Do are the initial concentrations of BOD and DO deficit in the stream at x
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