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Two bridge designs have been proposed for the new interstate highway to cross Detroit Michigan to Windsor, Ontario. A bridge constructed from wood will cost $6000 and will last for eight years. Bridge constructed form steel will cost $11,000 and will last for twenty years. Either bridge will have a zero salvage value at the end of its life. Use an interest rate of 8% and determine whether the increased life of the steel bridge justifies the increased cost.
Christian is picking out ties for a business trip. Anastasia knows from experience that Christian has a 50% chance of picking a grey tie. Find the probability Christian won't pick out a grey tie until the 3rd or 4th tie.
at one point on the highway, a 720 ft equal-tangent crest vertical curve exists. measurements show that at 3+40 stations from the PVC, the vertical curve offset is 3.5 ft. assess the adequacy of this existing curve in light of the reconstruction d..
We have a batch reactor ( r = -k1) with volume of V1. The concentration entering the batch reactor is Co. The batch reactor is operated from t =0 to t = t1. After that the water exits the batch reactor and enters a PFR (r = -k2C) wi..
Calculate the radius of a palladium atom, given that Pd has an FCCcrystal structure, a density of 12.0 g/cm^3 , and an atomic weightof 106.4 g/mol.
sand cone test has been performed . The test results: intial weight of cone + sand =13.51lb, Final weight of sand cone + sand= 4.26lb, weight of sand to fill cone=2.12lb, weight of soil from hole+bucket=12.42lb, weight of bucket=1.21lb
Assume that the width of the intersection in 24 ft and the car is 20 ft long. If the driver's perception-reaction time is 0.75 seconds, determine if he can clear the intersection safely for the following conditions
If the car passes point A with a speed of 20m/s and begins to increase its speed at a constant rate of At=0.5m/s^2, determine the magnitude of the car's acceleration when s=100m and x=0.
A 780-g mass is attached to a vertical spring and lowered slowly until the mass rests at its equilibrium position 30 cm below the original length of the spring. It is then set into simple harmonic motion of amplitude 5 cm.
Seawater flows steadily into an open 100 liter tank initially filled completely with freshwater. The freshwater mixes thoroughly with the seawater and the mixture overflows out of the tank.
acceleration of a particle traveling along straight line is a=(1/5)s^(1/2), s is in m, if v=0, s=3 when t=0 determine the particles velocity at s=6
determine the Allowable Stress Design (ASD) reference and adjusted design values for the following members and loading conditions. All members are No. 2 Hem-Fir and are fully braced to prevent lateral-torsional buckling.
The hull of a boat has a volme of 150m and the total mass of the boat when empty is 8560kg. determine how much load this boat can carry without sinking in a lake.
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