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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).
A plate is pulled upward from a pool of liquid with velocity, V, entering a thin liquid film on the surface of the plate. The flow is assumed to be laminar and the film thickness
compressed nitrogen (140 lbm) is stored in a spherical tank of diameter D = 2.5 ft @ temp. of 77 degrees Fahrenheit . what is the pressure inside the tank? if the max allowable stress is 30 ksi, find the minimum theoretical wall thickness.
A pendulum consists of a slender rod, AB, of weight Wr= 8.60 lb and a wooden sphere of weight Ws= 21.7 lb .(Figure 1) The length of the rod is d = 7.70 ft and the radius of the sphere is R = 0.500 ft .
Water is flowing in a horizontal 200-mm diameter pipe at a rate of 0.05 m^3/s, and the pressures at sections 80 m apart are equal to 500 kPa at the upstream section and 400 kPa at the downstream section.
1 an equal-tangent crest vertical curve is designed with a pvi at station 11000 and a pvc at station 10743.3. if the
Determine the critical depth in a trapezoidal channel with a 20 foot bottom width and 3:1 (H:V) side slopes if the Q = 1000cfs.
The buildings are single story with a rood line 6 feet above the man-door opening is constructed from clay brick that is 12 inches thick and weighs 115 psf. the opening of the man-doors are 3 feet 4 inches wide.
what value for Fy are the two forces F1=4i+Fyj+20K(N) and F2=8i-5j+7k(N) perpendicular to each other
A pump of 80% efficiency lifts water from one large open tank to another; the difference in water surface elevations is 20 feet. The pipe is relatively smooth (f = 0.0122), and has 3 elbows, each with a loss coefficient of 2/3.
bernard is a principal in a consulting engineering firm. he is also a principal owner in a construction contracting
a drinking water treatment plant will be designed to process a flow of 15000 m3d. the sedimentation tank will have a
determine the elongation of the cable due to its own weight. B. show thet the same elongation would be obtained if the cable were horizontal and if a force equal to half of its weight were applied at each end
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