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A house has a volume of 450 m3. The air-conditioning system is designed to replace the air in the house every hour, using ducts that have a square cross section. Assume that we can treat air as an incompressible fluid.
(a) The air in the ducts flows at 5.0 m/s, find the width of the ducts.
(b) How big would the ducts need to be if the owner wanted the air to only flow at 1.0 m/s?
We know that a spherical charged particle of will have an external electric field of E = k q/r2, where k = 8.988×109N·m2·C-2 is the Coulomb constant, q is the charge, and r is the distance from the center of the spherical particle.
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