denote the amount of salt in the tank at time 
. We're told that 
.
, the salt flows in at a rate of (1/5 lb/gal)*(5 gal/min) = 1 lb/min. When the regulating mechanism fails, 20 lbs of salt is dumped and no more salt flows for 
. We can capture this in terms of the unit step function 
and Dirac delta function 
as
denote the Laplace transform of 
. Take the transform of both sides to get
Solve using dirac deltla/discontinuous forcing
consider the following scenario. a salt tank th...
Mathematics, 18.07.2019 21:20 frankie666
Solve using dirac deltla/discontinuous forcing
consider the following scenario. a salt tank that initially contains 50 gallons of pure water. a brine solution containing 1/5 lb/gal of salt flows in to the tank at a rate of 5 gal/min. brine flows out of the tank at the same rate. at time t = 15 minutes the mechanism regulating salt flow in to the tank breaks and 20 pounds of salt is dumped instantaneously in to the tank. although water continues to flow in to the tank at the original 5 gal/min, there is no salt in the water.
1. write an ivp describing the amount of salt in the tank at time t.
2. solve the ivp from problem 1.
3. plot the solution found in problem 2 and explain the results.
Answers: 3
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