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Tall buildings can develop a significant difference in pressure between the inside and the outside of the building. Air lock entrances are used at the ground level so the pressure at the ground floor is not the same as atmospheric pressure. Assume that a skyscraper does not use an airlock entrance and that the temperature inside a 300 m skyscraper is 21°C and the temperature outside is a uniform 0°C. Assume standard atmospheric pressure at the base of the building and that the pressure is the same inside and outside at ground level. At the top of the building, calculate the pressure difference between the inside and the outside
(a) assuming air is incompressible,
(b) taking account of the compressibility.
(c) Is the compressibility of air important in this problem?
(d) What is the equivalent height of a water column for this pressure difference?
(e) If someone opens a window on the top floor will air go in or out?
If the evaporation rate from an open water surface is 0.27 inch/day in Tucson Arizona, what should be the surface area of the lagoon? (Note: arsenic does not evaporate but remains in the liquid water)
the flow profile is such that u=u(max)*(1-(r/R)^2) where u is the flow speed and r is the distance from the centre of the pipe in the radial direction. What is the shear stress on the pipe wall What is the shear force exerted by the oil on a 1m lo..
Axis of the hole is perpendicular to VP. Draw elevation, plan and development of the lateral surfaces of the pyramid.
Determine the horizontal and vertical components of reaction at the pin supports at A and B and indicate direction. Take F1 = 7 KN, F2 = 6 KN, and h = 1 m.
a plane truss is subjected to a loads 2P and P at joints B and C, respectively, as shown in figure part a.The truss bars are made of two L102 x 76 x 6.4 stell angles having an ultimate stress tension equal to 390 MPa (cross-sectional are of the tw..
Consider a highway section where traffic is stationary, all trucks travel at speed s and cars at speed v. If aerial surveillance revealed that trucks were a fraction p of the vehicles on a photograph
A cylindrical pressure vessel with hemispherical ends has a 2.5-m radius and a 5-mm wall thickness. It contains a gas with pressure pi = 6×10 5 Pa and the outer wall is subjected to atmospheric pressure p 0 = 1 × 10 5 Pa.
H = h - N. At point A, the geoid correction is -100 feet; the ellipse height is 100'. What is the NAVD88 elevation of point A
Estimate the contact time to achieve an effluent concentration of 200 fecal coliforms/100 mL using a Cl2 dose of 3 mg/L if the wastewater temperature is 28 oC. Assume the activation energy (Ea) at pH = 7.4 is 6,500 cal/mole.
A runs slope a distance of 156.777 m from one point to another point at a rate of +1.5%. What is the corresponding horizontal distance between the points?
Jack Flubber, who owns sons of Flubber Construction Co. and runs it as a proprietorships had gross profit last year of $ 80000. His personal and family expenses are $ 52000 and he has $ 7000 in exemptions and deductions.
A round bar of 6mm diameter is made of 6061-T6 aluminum. When the bar is stretched by an axial force P, its diameter decreases by 0.450 microns. what is the magnitude of the load P
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