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In Problems 13–32 use variation of parameters to solve the given nonhomogeneous system.
24.
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A First Course in Differential Equations with Modeling Applications (MindTap Course List)
- 1. The Lotka-Volterra or predator-prey equations dU = aU – UV, dt (1) AP = eyUV – BV. dt (2) have two fixed points (U., V.) = (0,0), (U., V.) = (- :). The trivial fixed point (0,0) is unstable since the prey population grows exponentially if it is initially small. Investigate the stability of the second fixed point (U..V.) = 6:27 PM 3/3/2021 近arrow_forward8.3 I only need number 14 pleasearrow_forwardProblem 11.3. Find a solution to the equation Utt = Uxx, x ≤ [0; 1], t ≥ 0, with ut(x,0) = 0, for x = [0; 1/2], u(0, t) = 0, u(1, t) = 0, u(x, 0) = 0, ut(x,0) = 1, for x € [1/2; 1],arrow_forward
- Tr.28.arrow_forwardHw.137.arrow_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_forward
- 1.1 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_forwardProblem 13.3.5: Suppose heat is lost from the lateral surface of a thin rod of length L into a surrounding medium at temperature zero. If the linear law of heat transfer applies, then the heat equation takes on the form azu ди k hu 0 0 ´əx² at' where h is a constant. Find the temperature u(x, t) if the initial temperature is f (x) throughout and the ends x = 0 and x = L are insulated. See figure below. insulated 0° insulated 0° heat transfer from lateral surface of the rodarrow_forwardProblem 2. Consider the equation: x?y"(x) – xy' +y = 0. Given that yı(x) = x is a solution of this equation. Use the method of reduction of order, find the second solution y2(x) of the equation so that y1 and y2 are linearly independent. (Hint: y2(x) should be given in the form y2(x) = u(x)y1(x). Substitute it into the equation to find u(x).) %3Darrow_forward
- 5.1. Determine the response x(t) of a system described by the differential equation x" + 3x" + 2x' = 0 , x(0) = 0 , x'(0) = 1 , x"(0) = -4arrow_forwardExample 7.2. Find a solution of the following system of ODEs using method of variation of parameters. Use y₁ (0): = 19 and y₂ (0) = -23. * = [6²1]+[A]* y' 3 5 5 etarrow_forward12. [Kaplan & Glass(1995)] Limpets and seaweed live in a tide pool. The dynamics of this system are given by the differential equations ds s² – sl, = S dt dl sl --2, 1>0,s > 0, dt 2 where the densities of seaweed and limpets are given by s and l, respectively. (i) Determine all equilibria of this system. (ii) For each nonzero equilibrium determined in part (a), evaluate the stability and classify it as a node, focus, or saddle point. (iii) Sketch the flows in the phase plane. (iv) What will the dynamics be in the limit as t → o for initial conditions (i) s(0) = 0, 1(0) = 0? (iї) s(0) — 0, 1(0) — 15? (iii) s(0) = 2, 1(0) = 0? (iv) s(0) = 2, 1(0) = 15?arrow_forward
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