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You purchase a house with a known radon problem. The house has a 1 m high dirt-floored crawl space. The emission rate of radon into the crawl space is reported to be 0.6 pCi/m2s. An exhaust system was added to provide 1 air exchange per hour (ACH) in the crawl space. The outdoor concentration of radon is 1 pCi/L.
Develop a mass balance for this problem and estimate the steady-state radon concentration in the crawl space (in pCi/L).
The longitudinal slope of the swale is to be 1.5% with side slopes of 5:1 (H:V). If the grassed swale has a Manning's n of 0.030 and a minimum infiltration rate of 200 mm/hr, determine the length of the swale required.
The homogeneous gate shown in Fig. P2.88 consists of one quarter of a circular cylinder and is used to maintain a water depth of 4 m. That is, when the water depth exceeds 4 m, the gate opens slightly and lets the water flow under it. Determine the w..
In one observation well water stands 28.8 ft above the bottom at a radius of 687 ft, and in the other it stands 22.5 ft above the bottom. What is the discharge per 100 foot wide strip of the aquifer in square ft per day
a soil sample is obtained by pushing a 16 in long tube into the side of a pit. the tube has an inside diameter of 3 in. and weighs 1.8 lb. The soil in the tube is trimmed so that its ends are flush with the ends of the tube.
A tugboat tows a ship at a constant velocity. The tow harness consists of a single tow cable attached to the tugboat at point A that splits at point B and attaches to the ship at points C and D.
Assume that (t) is givenin degrees, and write the matlab statement to evaluate tan (t) aslong as the magnitude of cos(t) is greater then or equal to(10^-20). If the magnitude of cos(t) less then (10^-10,
A baseball is hit from home plate and travels over the center field fence. What would the trajectory of the baseball look like if air-resistance was not factored in
The dimensionless henry's constant for TCE at 25 degrees celsius is 0.4. A sealed glass vial is prepared that has an air volum of 4mL overlying an aquesous volume of 36mL.
An unknown fluid flows through a horizontal 35-mm-diameter pipe with a Reynolds number of 100,000 and a density of 680 kg/m3. The pressure drop across a 21-mm-diameter nozzle meter placed in the pipe is 4.2 kPa.
A sample of undisturbed soil has a dry weight of 10 lb and volumen of 1 ft^3. If the specific gravity of the soil solids is 2.65, determine the void ratio and the porosity.
Calculate the viscous drag force on this plate, assuming boundary-layer flow with free-stream velocity of 15 ft/s and plate dimensions of L = 8 ft and W = 4 ft.
A high-strength steel simply supported W24 X 76 beam carries a uniformly distributed load over its entire length of 25 ft. (a) If the allowable stress is 33 ksi, what may be the value of the load, in addition to the beam's own weight
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