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In an Less-than-Truckload trucking company, terminal docks include casual workers who are hired temporarily to account for peak loads. At the Omaha, Nebraska, dock, the minimum demand for casual workers during the 7 days of the week (starting on Monday) is 20, 14, 10, 15, 18, 10, and 12 workers. Each worker is contracted to work 5 consecutive days.
Develop the model by finding the 1)variables 2)objective function 3) and constraints
At what air temperature will exhaled breath condense by self-nucleation. Assume that a saturation ratio of 4.3 is required.
A sand sample has a porosity of 38% and specific gravity of solids of 2.66. Find the void ratio and wet unit weight in lb / ft3 if the degree of saturation is 35%.
The Earth may be considered as a sphere whose diameter is 8000 mi. and whose density is roughly approximated to be 6560 kg/m^3. What is the mass of the Earth in pound-mass and kilograms
Two pounds of an ideal gas are contained within a piston-cylinder arrangement. The initial volume and pressure are 1 ft3 and 75 psia respectively. The final volume is 3 ft3.
The water velocity is estimated to be 3.0 m/sec. Acetone has a density of 0.786 gm/mL and a half-life in water of 20.0 hr. Determine the concentration of acetone in the river due to this pulse release at distance of 2, 4, and 7 km from the site at..
A biological reactor is used to treat wastewater from a small community (Q = 100,000 gpd). The influent BOD5 concentration to the reactor is 200 mg/L and the required effluent BOD5 concentration is 30 mg/L.
Using the method of lee et al. predict the temperature required in an isothermal plug flow incinerator to reduce the xylene level in a waste gas from 1000 ppm to 10ppm. Assume a residence time of 0.7 sec.
The maximum flow rate of a standard shower head is about 3.5 gpm and can be reduced to 2.75 gpm by switching to a low-flow shower head that is equipped with flow controllers. Consider a fam- ily of four, with each person taking a 6-minute shower e..
A triaxial test was performed on a dry, cohesionless soil under confining pressure of 144 kN/m^2. If the sample failed when the deviator stress reached 395.8 kN/m^2, determine the soil's angle of internal friction.
Just below the point where a continuous discharge of pollution mixes with the river, the BOD is 10.9 mg/L and the DO is 7.6 mg/L. The river and waste mixture has a temperature of 20oC, a deoxygentation constant of 0.2/day
Determine the cycle time for a single engine scraper rated at 21 cy heaped that is used to haul material from a pit to a fill 900 ft away under severe conditions. The average haul speed will be 14 mph and the average return speed will be 20 mph.
You may assume that the total pressure at the downstream station is uniform across the tunnel and given by the value at the wall. Neglecting gravitational effects.
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