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Unformatted text preview: 1 MATH 141B Quiz#7 Due: Tues March 18, 2008 More interesting and realistic models take some time to set up. However, since Ive clearly laid things out, youll simply be going through the 7step method to solve a linear differential equation, and taking a limit to get long range information. [ 2 ] 1. A 100gallon is filled with pure water . Salt water (brine) of concentration 0.1 pounds of salt per gallon of water is pumped into the tank at 25 gallons per minute. Brine leaves the tank at the same rate. Let y ( t ) denote the amount of salt in the tank at time t . Set up and solve a first order differential equation for the unknown function y ( t ) and compute the amount of salt in the tank in the long run. That is, find y = lim t y ( t ) . In this problem, you will be using the differential equation y = ( F V ) y + I. Note that I = c F , as the units confirm: lbs gal gal min = lbs min (since gallons cancel)....
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This test prep was uploaded on 03/30/2008 for the course MATH 141B taught by Professor Marcfabbri during the Spring '08 term at Pennsylvania State University, University Park.
 Spring '08
 MARCFABBRI
 Math, Logic

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