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Phase Line Diagrams. Problems
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Differential Equations: An Introduction to Modern Methods and Applications
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- In each of the following problems, sketch the graph of f(y) versus y, determine the equilibrium solutions, and classify each one as asymptotically stable, asymptotically unstable, or semi-stable. Draw the phase line, and sketch several graphs of solutions in the ty-plane. Here y0 = y(0)arrow_forwarda. Identify the equilibrium values. Which are stable and whichare unstable?b. Construct a phase line. Identify the signs of y' and y''.c. Sketch a representative selection of solution curves. dy/dx = y2 - 1arrow_forward2a. Find a change of variable that transforms the equation into an autonomous equation change of variable: new equation: b. Sketch the phase line for the resulting equation and use it to sketch graphs of the long-term behaviors of all the qualitatively different solutions for the new variable, and then for the original equation.arrow_forward
- [6] An equation dt = f(y) has the following phase portrait. 2 Y (a) Find all equilibrium solutions. (b) Determine whether each of the equilibrium solutions is stable, asymptotically stable or unstable. (c) Graph the solutions y(t) vs t, for the initial values y(1.4) = 0, y(0) = 0.5, y(0) = 1, y (0) = 1.1, y(0) = 1.5, y(-0.5) = 1.5, y(0) = 2, y(0) = 2.5, y(0) = 3, y(0) = 3.5, y(0) = 4, y(0) = 4.5, y(-1) = 4.5. (Without further quantitative information about the equation and the solution formula, it's clearly impossible to draw accurate graphs of y(t) vs t. Here, try to sketch graphs qualitatively to show the correct dynamic properties. The point is that a great deal of info about solution dynamics can be read off from one simple figure of phase portrait.)arrow_forward1) Find all equilibrium solutions of the equation (1 − x) (x² − 4) - x = and classify each one in terms of stability. Draw a phase space diagram and sketch by hand several typical solution curves. Describe the long term (t → ±∞) behavior of the solutions.arrow_forwarda. Identify the equilibrium values. Which are stable and whichare unstable?b. Construct a phase line. Identify the signs of y' and y''.c. Sketch several solution curves. y' = y - √y, y > 0arrow_forward
- Problems 8 through 13 involve equations of the form dy/dt = f(y). In each problem sketch the graph of f(y) versus y, determine the critical (equilibrium) points, and classify each one as asymptotically stable, unstable, or semistable. Draw the phase line, and sketch several graphs of solutions in the ty-plane.arrow_forward[14] For each of the following equations, find all equilibria; • find general solutions; • solve the initial value problem with initial condition ₁ (0) = 2, x₂(0) = 1; • sketch the phase portrait, identify the type of each equilibrium, and determine the stability of each equilibrium. 10 x1 1 1 - 3-4 963 = (b) Q]=[4][B]+[B] x2 -5 -7 3 (a)arrow_forward7) In each of the following problems:a. Sketch the Phase Plot of the ODE.b. Determine the equilibrium solutions.c. Classify the equilibrium solutions.d. Draw the phase line and sketch several graphs of solutions on the ty-plane. (7a) y′ = y(y −1)(y −2) , y0 > 0 (7b) y′ = y (1 −y2) , −∞< y0 < ∞. (7c) y′ = y2(1 −y)2, −∞< y0 < ∞. carrow_forward
- 1. Consider the model for population growth below. Use a phase line analysis to sketch solution curves for P(t). Determine if the identified equilibrium is stable or unstable. dP —D P(1 — 2Р) dt 2. Model your own Romeo-Juliet problem. Explain your assumptions and show a plot of the numerical solution. You may add a background story if you want to.arrow_forward(a) sketch the nullclines, (b) sketch the phase portrait, and () write a brief paragraph describing the possible behaviors of solutions. dx =x(-4x – y + 160) dt dy = y(-x? - y² + 2500) dtarrow_forwardPhase Line Diagrams. Problems 1 through 7 involve equations of the form dy/dt = f(y). In each problem, sketch the graph of f(y) versus y, determine the critical (equilibrium) points, and classify each one as asymptotically stable or unstable. Draw the phase line, and sketch several graphs of solutions in the ty-plane. 1. dy/dt = y(y - 1)(y-2), yo≥ 0arrow_forward
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