3. Solve the following initial value problems using Laplace transforms. (a) y' + 5y = sin(2t), y(0) = 0. (b) y" +2y' + y = e=t, y(0) = 0, y' (0) = 0.
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- 20.Consider two interconnected tanks similar to those in Figure 7.1.6. Initially, Tank 1 contains 60 gal of water and Q01Q10 oz of salt, and Tank 2 contains 100 gal of water and Q02Q20 oz of salt. Water containing q1 oz/gal of salt flows into Tank 1 at a rate of 3 gal/min. The mixture in Tank 1 flows out at a rate of 4 gal/min, of which half flows into Tank 2, while the remainder leaves the system. Water containing q2 oz/gal of salt also flows into Tank 2 from the outside at the rate of 1 gal/min. The mixture in Tank 2 leaves it at a rate of 3 gal/min, of which some flows back into Tank 1 at a rate of 1 gal/min, while the rest leaves the system. a.Draw a diagram that depicts the flow process described above. Let Q1(t) and Q2(t), respectively, be the amount of salt in each tank at time t. Write down differential equations and initial conditions for Q1 and Q2 that model the flow process. b.Find the equilibrium values QE1Q1E and QE2Q2E in terms of the concentrations q1 and q2. c.Is it…Consider the following tank-water system. Tank A holds 200 liters of water, initially pure. Brine with a concentration of 3 grams of salt per liter flows into tank A at 5 liters per minute. The solution flows out of tank A into tank B at a rate of 5 liters per minute. Tank B is a 125 liter tank of initially pure water which receives the outflow from tank A, and the well-mixed solution flows out of tank B at 5 liters per minute. Write down a system of differential equations that models the scenario.solve and draw a diagram of the problem Two large tanks, each holding 100L of liquid, are interconnected by pipes, with the liquid flowing from tank A into tank B at a rate of 3L/min and from tank B into tank A at a rate of 1L/min. The liquid inside each tank is kept well stirred. Pure water flows into tank A at a rate of 6L/min. The solution flows out of the system from tank A at 4L/min and from tank B at 2L/min. If, initially, tank A contains pure water and tank B contains 20kg of salt, determine the mass of salt in each tank at time t ≥ 0.
- Consider the two-tank connection pictured below. The salt water flows at specified rates and thesolution is assumed to be “well-stirred”. Each tank has a capacity of 5000 gal. Initially, Tank 1 has 500 gal. of fresh water and Tank 2 has 800 gal. of salt water with 2 lb of salt dissolved in it. Salt water with a concentration of 1/5 lb/gal enters Tank 1 at a rate of 4 gal/min and the mixture leaves at a rate of 7 gal/min at the same time. Salt water with a concentration of 1/4 lb/gal enters Tank 2 at a rate of 10 gal/min and the mixture leaves at a rate of 9 gal/min at the same time. Additionally, the mixture from Tank 1 flows into Tank 2 at a rate of 3 gal/min andthe mixture from Tank 2 flows into Tank 1 at a rate of 8 gal/min. Let Q1(t) and Q2(t) denote theamounts of salt in pounds in Tanks 1 and 2 at time t in minutes. Set up the initial value problemsfor Q1(t) and Q2(t) at time t. (Do not solve.)Two connected tanks, each with a capacity of 50 liters, contain brine (saltwater). Initially, the first tank contains 18 liters of brine with a salt concentration of 3 grams per liter and the second contains 17 liters of brine with a salt concentration of 2 grams per liter. At t = 0 brine with a salt concentration of 6 grams per liter flows into the first tank at 8 liters per hour. Well-stirred brine flows from the first tank into the second at 7 liters per hour, from the second into the first at 5 liters per hour, from the first into a drain at 4 liters per hour, and from the second into a drain at 3 liters per hour. (a) Determine the volume (liters) of brine in each tank as a function of time.(b) Give an initial-value problem that governs the amount (grams) of salt in eachtank as a function of time.(c) Give the interval of definition for the solution of this initial-value problem.Two tanks are interconnected. Tank A contains 60 grams of salt in 50 liters of water, and Tank B contains 50 grams of salt in 40 liters of water.A solution of 1 gram/L flows into Tank A at a rate of 5 L/min, while a solution of 4 grams/L flows into Tank B at a rate of 7 L/min. The tanks are well mixed.The tanks are connected, so 8 L/min flows from Tank A to Tank B, while 3 L/min flows from Tank B to Tank A. An additional 12 L/min drains from Tank B.Letting xx represent the grams of salt in Tank A, and yy represent the grams of salt in Tank B, set up the system of differential equations for these two tanks.dxdtdxdt = −850x+340y+5Correct dydtdydt = 850x−12y+28Incorrect x(0)x(0) = Correct, y(0)y(0) = Correct Submit QuestionQuestion 1
- A refinery manufactures two grades of jet fuel, Fl and F2, by blending four types of gasoline, A. B, C, and D. Fuel Fl uses gasolines A. B. C, and D in the ratio 1:1:2:4, and fucl F2 uses the ratio 2:2:1:3. The supply limits for A, B.C, and D are 1000, 1200, 900, and 1500 bbl/day, respectively. The costs per bbl for gasolines A, B, C, and D are $120, $90, $100, and $150, respectively. Fucls Fl and F2 sell for $200 and $250 per bbl, respectively. The minimum demand for F1 and F2 is 200 and 400 bbl/day, respectively. Develop an LP model to determine the optimal production mix for F1 and F2, and find the solution using execl SolverA chicken farmer can buy a special food mix A at 20c per Kg and special food mix B at 40c perKg. Each Kg of mix A contains 3000 units of nutrient N1 and 1000 units of nutrient N2; eachKg of mix B contains 4000 units of nutrient N1 and 4000 units of nutrient N2. If the minimumdaily requirements for the chickens collectively are 36000 units of nutrient N1 and 20000 unitsof nutrient N2, how many pounds of each food mix should be used each day to minimize dailyfood costs while meeting (or exceeding) the minimum daily nutrient requirements? What is theminimum daily cost?Parent W requires one of component B and two of component C. Both B and Care run on work center 10. Setup time for B is 2 hours, and run time is 0.1 hour perpiece. For component C, setup time is 2 hours, and run time is 0.15 hour per piece. Ifthe rated capacity of the work center is 80 hours, how many Ws should be producedin a week?
- A plant food is made from three chemicals, labeled I, II, and III. In each batch of the plant food, the amounts of chemicals II and III must be in the ratio of 5to 3. The amount of nitrogen must be at least 39 kg. The percent of nitrogen in the three chemicals is 8%,4%,and 5%,respectively. If the three chemicals cost $1.02 $0.86 and $0.66 per kilogram, respectively, how much of each should be used to minimize the cost of producing at least 600 kg of the plant food?Consider two tanks T1 and T2 with T1 containing 50 gallons of water in which 25 pounds of salt is dissolved and T2 containing 50 gallons of pure water. Pure water flows from outside into T1 at a rate of 4 gal/min and salt solution is circulated at rates of 6 gal/min from T1 to T2 and 2 gal/min from T2 to T1. If the content of T2 is withdrawn out of the system at the same rate as the pure water to T1 (i.e., 4 gal/min) to ensure no liquid volume change in the system, and the mixture in each tank is well mixed, find the salt contents y1 (t) and y2 (t) in T1 and T2 respectively. Determine the time it would take for the salt contents in the two tanks to be equal.2.) A chemist makes a component of orchid fertilizer that requires two secret ingredients labeled as A and B. She sells ingredient A at Php 200 per kilogram and ingredient B at Php 350 per kilogram. Per production, a kilogram of ingredient A requires 4 units of special pollen while 3 units for each kilogram of ingredient B. Suppose the excess of ingredient B over ingredient A per production should be at most 4 units, and there are only 24 units of special pollen available per production, how many kilograms of ingredient A and ingredient B should be made per production to maximize the sales? Solution: