Problem 2. A large tank is filled to capacity with 500 gallons of pure water. At exactly noon, brine containing 2 pounds of salt per gallon is pumped into the tank at a rate of 5 gal/min. At the same time, a valve is opened in the bottom of the tank, allowing the well-mixed solution to flow out at a faster rate of 10 gal/min. (a) Clearly set up and solve the initial value problem that allows you find Q(t), the number of pounds of salt in the tank at timet. (b) At what time will the tank be completely empty? (c) As soon as the tank completely drains from the bottom, both values are shut off. How much salt passed through the tank from when the valves were first opened? (d) At what time does the tank contain the most salt (in pounds)? (e) Is this also the time when the concentration of salt in the tank is highest? Hint: Justify your answer for parts (d) and (e) by graphing C(t), the concentration of salt in the tank at time t, along with the volume V(t), and Q(t).
Problem 2. A large tank is filled to capacity with 500 gallons of pure water. At exactly noon, brine containing 2 pounds of salt per gallon is pumped into the tank at a rate of 5 gal/min. At the same time, a valve is opened in the bottom of the tank, allowing the well-mixed solution to flow out at a faster rate of 10 gal/min. (a) Clearly set up and solve the initial value problem that allows you find Q(t), the number of pounds of salt in the tank at timet. (b) At what time will the tank be completely empty? (c) As soon as the tank completely drains from the bottom, both values are shut off. How much salt passed through the tank from when the valves were first opened? (d) At what time does the tank contain the most salt (in pounds)? (e) Is this also the time when the concentration of salt in the tank is highest? Hint: Justify your answer for parts (d) and (e) by graphing C(t), the concentration of salt in the tank at time t, along with the volume V(t), and Q(t).
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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