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1. A 9,000-lb single wheel load is placed on a PCC slab that is 9.5 in. thick. The concrete has a modulus of elasticity of 5 million psi with a Poisson’s ratio of 0.15. The modulus of subgrade reaction is 225 pci. Tire pressure is 90 psi.
(a) Calculate the maximum bending stress if the load is placed at the interior of the slab, assuming the shape of the loaded area is: (i) A circle; (ii) A square. Comment on the practical significance of the discrepancy between the two solution sets.
2.Solid waste production in the United states was 4.3lbs/person-day. Calculate the potential methane production in one year for a land fill that serves a community of 50,000 people. Assume that none of the solid waste is recycled, that all the solid waste can decompose rapidly, and that the density of methane equals 0.717kg/m cubed
Replace the given forces by a wrench and determine the coordinates of the intersection of its line of action (the coordinate of point P) with the plate. With a Force Fca=(100i+100j)N coming off of point C
Measurements of groundwater concentrations of silica (SiO2) in mg/L, were made at a sample of 12 wells in Birmingham. The sample mean concentration was 61.3 and the standard deviation was 5.2.
Commercial aqueous nitric acid, HNO3, has a density of 1.42 g/mL and is 16 M. Calculate the weight percent of HNO3 in the solution.
For the following waste and river characteristics just upstream from the outfall, find the minimum downstream DO that could be expected
A 900-mm strip of steel is bent into a full circle by two couples applied. Determine (a) the maximum thickness t of the strip if the allowable stress of the steel is 420 MPa, (b) the corresponding moment M of the couples.
For determining the centroid of the area, two square segments are considered; square ABCD and square DEFG. What are the coordinates (x, y ) of the centroid of square DEFG?
The cost of running this fleet is $325/hr per truck. For a given contract, a total of 2,500 tons must be removed from one construction site and moved to another location 35 miles away.
The median value of the rupture strength was 300 MPa. The ceramic is to be used for components with dimensions l=50mm, b=d=5mm loaded in simple tension along their length. Calculate the tensile stress that will give a probability of failure of the..
The pedestal supports a load P at its center. If the material has a mass density p, determine the radial dimension r as a function of z so that the average normal stress in the pedestal remains constant.
Determine the deflection at the mid span of a simple beam (wood joist) of a row house. The joist is designed as 2x12@16'' for DL = 12psf and LL=40 psf. The span length of the joist is 18'
The variable capacitor in the tuner of an AM radio has a capacitance of 135pF. When the radio is tuned to a station at 550kHz what is the capacitance for station at 1600kHz.
A bridge has been constructed between the mainland and an island.The total cost (excluding tolls) to travel across the bridge isexpressed as C = 50 + 0.5V, where V is the number of veh/h and C isthe cost/vehicle in cents.
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