CH ENGR 101A Quiz: 2017 Homework 3
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A classroom contains dust of uniform concentration c = dust . It is to be cleaned up by introducing fresh air at velocity vi through a duct of area ai on one wall and exhausting the room air at velocity v0 through a duct a0 on the opposite wall. Find an expression for the instantaneous rate of change of dust mass dm dust dt within the room. A water jet of velocity vj impinges normal to a flat plate which moves to the right at velocity vc. Find the force (in n) required to keep the plate moving at constant velocity if the jet density is. 1000 kg/m3, the jet area is 3 cm2, and vj and vc are 20 and 15 m/s, respectively. *neglect the weight of the jet and plate, and assume steady flow with respect to the moving plate with the jet splitting into an equal upward and downward half-jet.
