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Consider a house into which radon is emitted through cracks in the base-ment. The total volume of the house is 650 m3 (assume that it is well mixed throughout). The radon source emits 250 pCi s-1 (pCi, or picoCuries, is a unit proportional to the amount of radon gas, and indicates the amount of radioactivity of the gas). Air inflow and outflow can be modeled as a flow of clean air into the house of 722 m3 h-1, and an equal air flow out. Radon can be considered to be conservative in this problem.
(a) What is the retention time of the house?
(b) What is the steady-state concentration of radon in the house? Express your answer in units of pCi/L.
The cross sectional dimensions of a 4-ft-long wood member at 30% moisture content is 1.5 in. x 7.5 in., and its weight is 11 lb. At oven-dry condition, its dimensions and weight are 1.35 in x 6.8 in., and 10.2, respectively. What is its specific g..
In an oedometer test, the void ratio of a clay sample changed from 1.62 to 1.41 as the vertical effective stress imposed on the sample was increased from 100 kPa to 200 kPa.
A 10 feet thick clay that was unsaturated with a unit weight of 108 pcf and a water content of 20% gets saturated and also swells by 20% due to rain. G=2.70.
A significant obstacle in the design of atomic weapons is theso-called delta phase instability (a type of mixed dislocation) inPu-239. This is the problem: We wish to construct a sphericalatomic bomb core out of pure delta phase (f.c.c.) Pu-239. A de..
The water table is 7m below the surface of the sand. The saturated unit weight of the sand is 19kN/m3 and that of the clay 20kN/m3; the unit weight of the sand above the water table is 16kN/m3.
Find the required diameter of the force main PA, (dPA), if the pressure at point A is not allowed to drop below 370 kPa. Determine the required diameter of pipe BC, (dBC), if the maximum allowed head loss in the network ABC is 0.003 m/m.
The partition is free to move and allows conduction from one gas to the other without energy storage in the partition itself. The air and carbon dioxide each behave as ideal gases. Determine the final equilibrium temperature
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.
Find the direction and magnitude of the equivalent force at the section a-a. Find the direction and magnitude of the bending moment at the section a-a
1. The vertical compressive stress at a point in a soil is 100kN/m2 while the horizontal compressive stress at the same point is 57kN/m2. Both stresses are principal stress.
Carbon dioxide gas contained within a piston-cylinder assembly undergoes three processes in series. Sketch the processes on P-V coordinates and evaluate the work for each process in kJ.
While cost is an important issue, include some discussion on the potential long-term performance of the selected pavement as compared with other pavements
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