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Radon from well water may pose a radiological health hazard. One treatment technique is simply to hod the water in storage, allowing the radon to decay. The decay rate is first order:
Rn---> Products ; k= 0.2day^-1
Consider a situation in which water is delivered from a well to a household at a rate of 1m^3/day . The radon concentration is to be reduced by storage to 7 percent of its level in the untreated supply.
a. How large must the storage tank be if it acts a plug-flow reactor?
b. How large must the storage tank be if it acts a completely mixed flow reactor?
c. If the storage tank system consists of two identical CMFRs in series, how large must each be to achieve the desired level of control?
A spillway carries a discharge of 22.5 m^3/s with the outlet velocity of 15 m/s at a depth of .2 m. Select an adequate USBR stilling basin and determine the sequent depth, the length of the hydraulic jump and the energy loss.
thermo-gravimetry of calcium oxalate1. evaluate the percent mass loss for each of the three thermal events indicated
calculate the moment of inertia for the Milkyway. Assume it to be a disk.
The 10-mm-diameter steel bolt is surrounded by a bronze sleeve. the outer diameter of this sleeve is 20 mm, and its inner diameter is 10 mm. if the yield stress for the steel is
Two Cables support a large lift which weighs 8 tons. find the forcein the cables and size them based on E= 30000 psi and the allowabletensile stress is 14400 psi.
If they pull themslevles along the the rope until they meet how far does each skater travel? B)If only the 45 kg skater pulls along the rope until she meets her friend( who just holds onto the rope) how far does each skater travel?
A 5-micron droplet of water is being carried in standard air toward a 500-micron drop of water at a relative velocity of 40m/s. Will the two drops collide
how far back from the front axle would the center of gravity have to be to ensure that the maximum tractive effort developed for front- and rear- wheel-drive options is equal (assume that all other variables are unchanged)
a vertical triangular orifice in the wall of a reservoir has a base 0.9m long0.6m below its vertex and 1.2 m below the
The average unit weight of this soil is 118 lb/ft^3, and the average moisture content is 9.6%. It also has a maximum dry unit weight of 122 lb/ft^3 and an optimum moisture content of 11.1%
There are 10 vehicles in a queue when an attendant opens a toll booth. Vehicles arrive at the booth at a rate of 4 per minute. The attendant opens the booth and improves the service rate over time following the function u(t) = 1.1 + .30t, where u(..
A 3 kg mass is attached to one end of a 1 m long cord. The other end of the cord is attached to the center of a rotating disk (with radius greater than 1 m) that has a very large constant angular velocity.
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