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In Problems 13–32 use variation of parameters to solve the given nonhomogeneous system.
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Chapter 8 Solutions
A First Course in Differential Equations with Modeling Applications (MindTap Course List)
- Example 11.1. Classify the following equations : a²u 22u d²u du du +4. +4 J + 2- = 0 Əxdy oy² ax dy a²u •+ (1 - y²¹). = 0, -∞ < x ∞, -1arrow_forwardTr.28.arrow_forward2) 3 3 dr+du+ +y=t dr subject to x = 1 and y = 0 at t = 0arrow_forward7. A scientist places two strains of bacteria, X and Y, in a petri dish. Initially, there are 400 of X and 500 of Y. The two bacteria compete for food and space but do not feed on each other. If x = x(t) and y = y(t) are the numbers of strains at time t days, the growth rates of the two populations are given by the system x' = 1.2x – 0.2y, y' = -0.2x + 1.5y Determine what happens to these two populations by solving the system of differential equations.arrow_forward1.1 A mathematical model that describes a wide variety of physical nonlinear systems is the nth-order differential equation y(n) = 9 (t, y, y, %3D .... where u and y are scalar variables. With u as input and y as output, find a state model.arrow_forward2.5 Consider the system x' = (² 9) x. Find the special values of a for which the phase plane changes type. (Assume det A=0).arrow_forward• Problem 2. Find all equilibrium points and determine the type of each isolated equilibrium. Verify with phase portrait. *, = (x, – x, X1 – x² – x;) i, = (x, +x, X1 – x} -x)arrow_forward5. Find a general solution of the linear system. x' = 2x + y ly' = x + 2y – e2tarrow_forward9. discuss the behavior of the dynamical system Xk+1= Axk where -0.31 (@) A = [ (b) A = ["0.3 11 1.5 0.3 (b) A = 0.3 1 3Darrow_forward8.3 I only need number 14 pleasearrow_forward5. The mixing tanks A & B initially contain 10 gallons of brine. Liquid is pumped in and out as shown in fig. Derive the differential equations that describe the number of pounds qi(t) &q2(t) of salt in tanks A & B respectively at time t. a) Solve the linear system subject to q1(0) = 7, q2(0) = 2 pounds of salt. b) Graph the phase plane portrait, component graphs and state the type of equilibrium. 11b/gal 2 gal/min 4 gal/min 10 gals. 10 gals. a gal/min 4 gal/min 2 gal/minarrow_forwardConsider the system = (41%) (22) + (1) * น in which a is a constant (a) Determine the condition under which the system is controllable (b) For a 1 (i) Show that et4 = (cos(t)) sin(t)) cos(t)) (Hint: You may note that A4 = 1, A4k+1 = A, A4k+2 = −I, A4+3 = -A for all k > 0 and determine the MacLaurin series expansion of cos(t) and sin(t)) To (ii) Write the integral formula for the solution X (t) in terms of X (0) = X₁ = and u. Yo (ii) Extract a separate formula for each component of X(t) = ((0)arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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