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Indoor Air quality is greatly affected by Radon, which can cause lung cancer. When we moved to Colorado, we tested the house for Radon and installed a radon mitigation system.
Consider the diagram below as a model for radioactive indoor air pollution.
Assume the soil under my single story house emits 1.5pCi/m2 of Radon. To be conservative, assume that all this Radon seeps through the floor and into the house. The floor space is 250 m2 and the ceiling height is 3m. The air exchange in the house is 0.9 air changes per hour.
Answer the following questions
a) Calculate the decay rate of radon in units of hr-1.
b) Develop a mass balance equation for the concentration of radon in the house using the diagram above.
c) Assuming steady state, what is the concentration of radon in the house in pCi/m3. Let the ambient outdoor concentration be negligible.
Suppose a sample of the 90 °C air is put in a closed variable-volume chamber containing a mirror, and the pressure is raised at constant temperature until a mist forms on the mirror. At what pressure would the mist form
a beryllium copper wire having diameter of 1-50 mm and length of 40mm is used as a small torsion bar in an instrument. determine what angle of twist would result in the wire when it is stressed to 250 mpa.
The uniform 30 kg bar OB is secured to the accelerating frame in the 30 degree position from the horizontal by the hinge at O and roller at A. if the horizontal acceleration of the frame is a equals 20 m/s^2
if D has a mass of 600 kg, determine the required mass of C, the maximum sag h of the cable, and the length of the cable between the pulleys A and B. The Beam has a mass per unit length of 50 kg/m.
Assume that you have a constant diameter pipe that has no pumps or turbines connected to it.Prove that the fluid in the pipe will flow from a location with high piezometric pressure to one with low piezometric pressure.
a temperature probe moves with the velocity 2i+2j-3k through air. the temperature of air changes as T(x,y,z,t)=(2x^2-3y+z^3)cos(at). Find the rate of change of temperature measured by the probe.
above a peninsula of land. the length of the box is 25 km, its width is 80 km, and a radiation inversion restricts mixing to 25 m. Wind is blowing clean air into the long dimention of the box at 0.8 m/s.
Wastewater flow of 2000 m3/day containing 120g/L of salt. Discharge into a river with a flow of 34,000 m3/day and a salt concentration of 50 mg/l. The agency wants to maintain the salt level to no greater than 250 mg/L downstream of the discharge.
A cyclone is designed with an inlet width (W) of 12.0 cm and has four effective turns. The inlet gas velocity is 15.0 m/s and the particle density is 1.70 g/cm3. (a) Estimate the particle size that will be collected with 50 % efficiency.
A water treatment plant with a maximum daily flow of 4.4 m3/s is treating surface water with a minimum ambient temperature of -1°C (30°F). The water is coagulated with alum and the alum floc was measured to have a settling velocity of 1.6 m/h at 1..
A 0.20 kg stone attached to a 0.8 m long string is rotated in a horizontal plane. The string makes an angle of 25° with the horizontal. Determine the speed of the stone.
The initial schedule called for 500 feet of pipeline to be installed each week, with the total construction cost projected to be $25 million. After 8 weeks, 4750' of pipeline has been installed at a cost of $11.25 million.
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