Consider two interconnected tanks as shown in the figure above. Tank 1 initial contains 10 (liters) of water and 310 g of salt, while tank 2 initially contains 100 L of water and 480 g o salt. Water containing 15 g/L of salt is poured into tank1 at a rate of 1.5 L/min while the mi flowing into tank 2 contains a salt concentration of 30 g/L of salt and is flowing at the rate c 3.5 L/min. The two connecting tubes have a flow rate of 4 L/min from tank 1 to tank 2; and 2.5 L/min from tank 2 back to tank 1. Tank 2 is drained at the rate of 5 Limin. You may assume that the solutions in each tank are thoroughly mixed so that the concentration of the mixture leaving any tank along any of the tubes has the same concentration of salt as the tank as a whole. (This is not completely realistic, but as in real physics, we are going to work with the approximate, rather than exact description. The 'rea equations of physics are often too complicated to even write down precisely, much less so How does the water each tank change over time? Let p(t) and g(t) be the number of grams (g) of salt at time t in tanks 1 and 2 respectively Write differential equations for p and q. (As usual, use the symbols p and g rather than p( and q(t).) q' = Give the initial values Show the equation that needs to be solved to find a constant solution to the differential equation: Ja A constant solution is obtained if p(t) = for all time t and q(t) for all time t.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Consider two interconnected tanks as shown in the figure above. Tank 1 initial contains 100L
(liters) of water and 310 g of salt, while tank 2 initially contains 100 L of water and 480 g of
salt. Water containing 15 g/L of salt is poured into tank1 at a rate of 1.5 L/min while the mixture
flowing into tank 2 contains a salt concentration of 30 g/L of salt and is flowing at the rate of
3.5 L/min. The two connecting tubes have a flow rate of 4 L/min from tank 1 to tank 2; and of
2.5 L/min from tank 2 back to tank 1. Tank 2 is drained at the rate of 5 L/min.
You may assume that the solutions in each tank are thoroughly mixed so that the
concentration of the mixture leaving any tank along any of the tubes has the same
concentration of salt as the tank as a whole. (This is not completely realistic, but as in real
physics, we are going to work with the approximate, rather than exact description. The 'real
equations of physics are often too complicated to even write down precisely, much less solve.)
How does the water in each tank change over time?
Let p(t) and g(t) be the number of grams (g) of salt at time t in tanks 1 and 2 respectively.
Write differential equations for p and g. (As usual, use the symbols p and q rather than p(t)
and q(t).)
q' =
Give the initial values
Show the equation that needs to be solved to find a constant solution to the differential
equation:
A constant solution is obtained if p(t) =
for all time t and q(t) =
for all time t
Transcribed Image Text:Consider two interconnected tanks as shown in the figure above. Tank 1 initial contains 100L (liters) of water and 310 g of salt, while tank 2 initially contains 100 L of water and 480 g of salt. Water containing 15 g/L of salt is poured into tank1 at a rate of 1.5 L/min while the mixture flowing into tank 2 contains a salt concentration of 30 g/L of salt and is flowing at the rate of 3.5 L/min. The two connecting tubes have a flow rate of 4 L/min from tank 1 to tank 2; and of 2.5 L/min from tank 2 back to tank 1. Tank 2 is drained at the rate of 5 L/min. You may assume that the solutions in each tank are thoroughly mixed so that the concentration of the mixture leaving any tank along any of the tubes has the same concentration of salt as the tank as a whole. (This is not completely realistic, but as in real physics, we are going to work with the approximate, rather than exact description. The 'real equations of physics are often too complicated to even write down precisely, much less solve.) How does the water in each tank change over time? Let p(t) and g(t) be the number of grams (g) of salt at time t in tanks 1 and 2 respectively. Write differential equations for p and g. (As usual, use the symbols p and q rather than p(t) and q(t).) q' = Give the initial values Show the equation that needs to be solved to find a constant solution to the differential equation: A constant solution is obtained if p(t) = for all time t and q(t) = for all time t
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