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A square foundation with dimension (BxB) has to be constructed on dense sand. Its depth is Df = 1 m. The unit weight and the angle of friction of the soil can be assigned representative values of 18kN/m3 and 39o, respectively. The foundation may be subjected to a maximum dynamic load of 1800 kN increasing at a moderate rate. Determine the size of the foundation using a factor of safety of 3. (Assume kv=0 and kh =0.176).
Water in a piston/cylinder at 400?C, 2000 kPa is expanded in a reversible adiabatic process. The specific work is measured to be 415.72 kJ /kg out. Find the final P and T and show the P-v and T-s diagrams for the process.
The composition of moist air is given on a molar basis to be 78 percent N2, 20 percent O2, and 2 percent water vapor.
calculate the magnitude and direction of the horizontal force exerted on the contraction (not on the water). Assume that there is no loss of energy in the contraction. Use the gamma of water is equal to 1000 kg/m^3
Nitrate concentrations are often recorded in units of NO3--N/L to be compared with other nitrogen constituents. Near three rural wells nitrate concentrations were reported as 0.25 mg
The factor of safety is defined as the ratio of the stabilizing moment divided by the overturning moment. The densities of concrete and water are = 2.40 and = 1 , respectively. Assume that the dam does not slide.
A galvanized iron pipe with a roughness height (e) of 5x10-6 m with a diameter (D) of 0.05 m and a length (L) of 100 m carries a discharge (Q) of 0.003 m3/s. Calculate the head loss (hL).
What is the concentration (M) of Al3+ in lake water with pH = 4 assuming the equilibrium below with excess Al(OH)3 (s) The reaction is Al(OH)3 (s) --> Al3+ + 3OH-. pKsp = 32.9.
Consider the function z(x, y), its partial derivatives (∂z/∂x)y and (∂z/∂y)x, and the total derivative dz/dx. (a) How do the magnitudes (∂x)y and dx compare?
Peg P is driven by the fork link OA along the curved path described by r = (2*theta) ft. At the instant theta = pi / 4, the angular velocity and angular acceleration of the link are (theta-1dot) = 3.0 rad/sec and (theta-2dot) = 1.1 rad/sec^2
calculate the neuron output for the following transfer functions
A cantilever beam AB has a rectangular cross section and is loaded by a force P at an angle α that acts at the centroid of the cross section. Two strain gages are placed at point C, which is at mid-height of the beam. Gage D measures the strai..
Steam enters the turbine of a single vapor power plant with a pressure of 10 MPa and a temperature of 580 C and expands adiabatically to 6 kPa. The isentropic turbine efficiency is 85%. Saturated liquid exits the condenser at 6 kPa and the isentropic..
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