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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.
If 30% of supplied water is retained within the consumption areas ( as garden water,...) determine daily average, daily maximum and daily minimum of wastewater using both tabulated coefficients and Gift's formula for peaking factor. N.B. Conduit I..
A closed tank having a volume of 1.0 ft3 is filled with 0.15 lb of a gas. A pressure gage attached to the tank reads 12 psi when the gas temperature is 80? F. There is some question as to whether the gas in the tank is oxygen or helium. Which do you ..
Two pipes, one circular and one square, have the same cross-sectional area. Which has the larger hydraulic radius, and by what percentage
A 0.4m^3 moist soil sample has the following: Moist mass = 711.2 kg, Dry mass 623.9 kg, Specific gravity of soil solids = 2.68 Estimate: a). Moisture content. b). Moist density.
A cylindrical specimen of soil is compressed by an axial principal stress of 500 kPa and a radial principal stress of 200 kPa. Plot Mohr's circle of stress and determine (a) the maximum shear stress and
A gun is aimed at point A located 15 degrees N or W. Knowing the gun forms and angle of 25 degrees with the horizontal and the max recoil force is 400 N, determine a) the x, y,z components of that force b)
Using the DeHoff method, compute the change in internal energy when 12 liters of argon gas at 273 K and 1 atm is compressed to 6 liters with the final pressure equals to 10 atm. Assume argon behaves ideally and CV = 3/2·R.
The height (in meters) of a projectile shot vertically upward from a point 2 m above ground level with an initial velocity of 24.5 m/s is h2+24.5t-4.9t^2 after t seconds. a) When does the projectile reach its maximum height? b) What is the maximum..
Knowing that the coefficents of friction between the tape and the drums are us=.40 and uk=0.30 and that drum C is free to rotate, determine the smallest allowable value of P if slipping of the tape on drum B is not to occur.
determine the power developed by the force when t = 5s. Hint: First determine the time needed for the force to cause motion.
A new development is to be constructed in Mexico City. Due to the large subsidence, the elevation at the proposed site must be raised prior to construction. The total volume of soil needed to raise the site is 100,000 cubic yards.
The mass flow rate of steam into a steam turbine is 5 kg/s . The turbine has a heat loss of 5 kj/s. if the velocity of the refrigerant is to be limited to 2 m/s, what is the minumum allowable pipe diamter
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