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A structural tension member of 10 ft. long with a square cross-section is subjected to a load of 120,000 lb. There is a choice between an aluminum alloy and structural steel, with the following information given for each.
Aluminum:
Unit weight (lb/ft^3) 165ultimate strength (psi) 45,000modulus of elasticity (psi) 10.5*10^6cost per lb $0.45
Steel:
Unit weight (lb/ft^3) 490ultimate strength (psi) 90,000modulus of elasticity (psi) 30*10^6cost per lb $0.21
A) Which material will be cheaper if you want a factor of safety of 5? (F.S = ultimate strength/applied stress).B) Which material will result in the lightest member if you want to limit the elongation to 0.20 in.? Which material will be cheaper under these conditions?
Calculate the metric tons of gravel required to fill an excavated area 70 meters by 50 meters by 2 meters deep if the gravel has a density of 1890 kg/(m^3).
An industry discharges PCE (tetrachloroethene, tetratchloroethylene, or perchloroethylene) into a small, well-mixed lake. The influent concentration is 0.4mg/L and the hydraulic residence time of the lake is 5days.
A steel pipe carries an industrial oil under pressure. The steel pipe inside diameter is 36 in, the pressure head on the fluid is 383.0 ft. A)- Find the internal fluid pressure in psi
A power plant emits 95 g/s of SO2 from an effective stack height of 60 m. The wind speed is 3 m/s and the solar insolation is slight. A) Estimate the ground level SO2 (ug/m^3) at a point 4 km directly downwind of the power plant
No incisions are noted. Find the maximum axial tension using LRFD. Can we resist the same force in compression if the member is 10ft long?
Moment of inertia of an I-beam with two different flange widths about the beam's centroidal axis As shown, an I-beam has a bottom flange that is150mm x30mm , a web that is 30mm x 150mm, and top flange 75mm x 30mm that is
A sample of 20 yields a mean 32.4. Test the two sided hypothesis that the sample drawn from a population with a mean of 35 for the following cases. (a) if a variance of the population is 33; and (b) if the variance of the population is unknown,
Using Darcy's Law, calculate the quantity of groundwater (L/day), the seepage velocity (m/s), and the contaminant loading (Kg/day) to the river (assuming no retardation) for the following scenario. Be sure to include both a plane view and cross-se..
determine the value of Po, as a funciton of H, for these two investment alternatives to be equivalent at an interest rate of i=15% per year.
A spillway carries a discharge of 22.5 m^3/s with the outlet velocity of 15 m/s at a depth of .2 m. Select an adequate USBR stilling basin and determine the sequent depth, the length of the hydraulic jump and the energy loss.
A regular hexagonal pyramid has an upper base edge of 16 ft. and a lower base edge of 28 ft. if the volume of the frustum is 18041 ft^3., find the lateral area of the frustum.
a rectangular beam with a width of a 8 in. an effective depth of 10 in., and a total depth of 12 in., is reinforced with a single fiberglass reinforcing bar that has a cross sectional area of 0.45 in^2.
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