Q3.Sp07

# Q3.Sp07 - of 6 gal/min. The well-mixed solution is then...

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American University of Sharjah Department of Math and Stat MTH205 – Differential Equations – Quiz #3 Instructor: A. Sayfy Spring 2007 Name: ________________________________ ID#: _______________ Q1. A certain city had a population of 0.5 million at 0 = t . At 10 = t it increases by 15%. What will be the population when 40 = t ? How fast is the population growing at 40 = t ?

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Q2. A large tank is partially filled with 100 gallons of fluid in which 10 pounds of salt are dissolved. Brine containing 2 1 pound of salt per gallon is pumped into the tank at a rate
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Unformatted text preview: of 6 gal/min. The well-mixed solution is then pumped out at a slower rate of 4 gal/min. a) Find the number of pounds of salt in the tank after 30 minutes. b) Estimate when the amount of the salt in the tank will be 100 pounds. Q3. A certain city had a population of 1.5 million now. Assume that it grows continuously at a 4% annual rate, and there is a constant immigration from the city at 50 thousand people per year. What will be its population after 25 years? Formulate the problem first and solve it....
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## This note was uploaded on 02/12/2012 for the course MTH 205 taught by Professor Sadik during the Spring '11 term at American Dubai.

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Q3.Sp07 - of 6 gal/min. The well-mixed solution is then...

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