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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 modulus of elasticity of the wood is 13GPa. If one side of the column is 25cm across, find the minimum dimension of the other side to keep the column's deformatin under 1.3 mm
find the unknown quantity in each of the following, using the standard series equivalence formulas and tables in the Appendix. Give preference to the approach yielding the fewest computational steps.
shaped nozzle such that the velocity along the center line of the flow increased from 1.5 m / s to 15 m / s at a distance of 37.5 m. specify the amount of convective acceleration at the beginning and end of the range.
A total of 6800 kg of a bulk fertilizer is stored in a flat-bottomed bin having side dimensions 5.0 m x 3.5 m. compute the loading on the floor in newtons per square meter, or pascals.
Air at 20oC and 1atm flows at 20 m/s past the flat plate shown below. A pitot tube placed 2mm from the wall, develops a manometer head h=16mm of Meriam red oil (SG = 0.827),
Annual rare based on amount of products which can ordinarily be shipped each year as a function of the amount of vehicles or service purchased with the first cost and the M&O costs.
material (LCY) in 12 yard dump trucks, placing it, and compacting the weight of the soil is 3,750 lb/cu.yd. (30 pts.) (show your calculations) a) Find the Swell and Shrinkage b) Load and Shrinkage Factors
Soil is excavated from a borrow to construct an embankment with a net volume of 50,000 cy. This is performed by compacting 12-in layers of the soil to a dry weight of 110 pcf at a moisture content of 18%.
As an agronomist you have been approached by a large pepper farmer who wishes to determine an appropriate"yield goal" fot this season. He provides you with yield data for ten year period which indicates that his production has been slowly decreasi..
An equal-tangent sag curve has its PVI at station 10+00 and elevation at 138 ft. Directly above the PVI the bottom of an overpass structure is at elevation 162 ft. The PVC is at station 4+00. If the initial grade is -4.0%
A surveyor measures an angle with two instruments; call them A and B. Both instruments produced unbiased measurements, but the standard deviation of measurements made with instrument A is twice that of B.
Groundwater in Taupe, Arizona, initially contains 1.8 mg/L of iron(III). What must the pH be raised to in order to precipitate 0.3 mg/L of the iron (T=25°C)
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