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8. (First order equations: Nonlinear dynamics: Critical points: Stability) (a) Sketch the graph o...
Consider the nonlinear System of differential equations di dt dt (a) Determine all critical points of the system (b) For each critical point with nonnegative x value (20) i. Determine the linearised...
Consider the nonlinear System of differential equations di dt dt (a) Determine all critical points of the system (b) For each critical point with nonnegative x value (20) i. Determine the linearised system and discuss whether it can be used to approximate the ii. For each critical point where the approximation is valid, determine the general solution of iii. Sketch by hand the phase portrait of each linearised system where the approximation behaviour of the non-linear system the linearised system...
f 5. (See 2.5, 16) Two models used in population modeling are the Logistic equation and...
f
5. (See 2.5, 16) Two models used in population modeling are the Logistic equation and Gompertz equation: dy dt dy = (r-ay)y and where r,a>0 are constant dt a) For both, sketch the graph of f(y) versus y, find the critical points, and determine asymptotic stability. (b) For 0 y a, determine where the graph of y versus t is concave up and where it is concave down. (c) Sketch solution curves near critical points, discussing differences in the...
Using Differential Equations. 6. For y, = y3 _ y, y(0) = 30, -00 <30 <...
Using Differential
Equations.
6. For y, = y3 _ y, y(0) = 30, -00 <30 < 00, draw the graph of (y) = y3-y versus y, determine the equilibrium solutions (critical points) and classify each one as unstable or asymptotically stable. Draw the phase line, and sketch several representative integral curves (graphs of solutions) in the (t, y) plane. Hint: None of this requires explicit formulas for solutions y = φ(t) of the initial value problem.]
Task 8. (10+5+5 pt) The following nonlinear system X' = x3 – x, y = x...
Task 8. (10+5+5 pt) The following nonlinear system X' = x3 – x, y = x – 5y has three critical points. The vector field appears below. (a) Find critical points and linearizations at critical points. Determine stability of critical points, (b) Sketch the phase portrait (feel free to use or not to use the provided vector field). (c) Can there be a solution of the system (x(t), y(t)) such that lim x(t) = 0? Explain your answer. t++ +...
1. The angular displacement e(t) of an undamped pendulum of length l swinging in a vertical...
1. The angular displacement e(t) of an undamped pendulum of length l swinging in a vertical plane under the influence of gravity can be modelled with the nonlinear second order ODE 0"(t) + "$(0(e) – Pef) = = 0, (1) where w2 = { (a) Re-write equation (1) as a system of first-order ODEs by defining (1 = 0(t) and 02 = 't). (b) Find the nullclines and equilibrium points for the system of first-order ODEs. (c) The first order...
6. [20 points] The following nonlinear differential equations describe the motion of a body in orbit...
6. [20 points] The following nonlinear differential equations describe the motion of a body in orbit around two much heavier bodies. An example would be an Apollo capsule in an Earth-moon orbit. The three bodies determine a two-dimensional Cartesian plane in space The origin is at the center of mass of the two heavy bodies, the r-axis is the line through these two bodies, and the distance between their centers is taken as the unit. Thus, if μ is the...
12. (8 points) A Graph Satisfying First and Second Derivative Conditions On the figure below, sketch...
12. (8 points) A Graph Satisfying First and Second Derivative Conditions On the figure below, sketch the graph of a function y = f(x) that satisfies: • f(-2) = -3, • f is continuous • F"(x) > 0 on (-00, 2). • f is concave up for 1 > 2, and • lim f(1) = -2. • f'(2) does not exist. 00
What is the solution for this first order nonlinear differential equation of this SIR model with...
What is the solution for this first order nonlinear differential equation of this SIR model with these initial conditions? S(t)=not infected individuals (1) l(t)- Currently Infected (588) R(t)- recovered individuals (0) This will be a nonlinear first order differential equation(ODE) dasi d/dt-sal-kt di/dt a (s-k/a) i dr/dt-ki Total population will be modeled by this equation consistent with the SlR model. d(S+l+R)/dt= -saltsal-kltkl-0 Solution: i stk/aln stK Model the topic using a differential equation. a) Draw any visuals (diagrams) that exemplify...
4 Consider the autonomous differential equation y f(v) a) (3 points) Find all the equilibrium solutions (critical...
4 Consider the autonomous differential equation y f(v) a) (3 points) Find all the equilibrium solutions (critical points). b) (3 points) Use the sign of y f(z) to determine where solutions are increasing / decreasing. Sketch several solution curves in each region determined by the critical points in c) (3 points) the ty-plane. d) (3 points) Classify each equilibrium point as asymptotically stable, unstable, or semi-stable and draw the corresponding phase line.
4 Consider the autonomous differential equation y f(v)...
3. Consider the system of differential equations = z+9-1 (a) Sketch the r-nullcline, where soluti...
just (A) (B) (C)
3. Consider the system of differential equations = z+9-1 (a) Sketch the r-nullcline, where solutions must travel vertically. Identify the regions (b) On a separate set of axes, sketch the y-nullcline, where solutions must travel horizon in the plane where solutions will move toward the right, and where solutions move toward the right tally. Identify the regions in the plane where solutions will move upward, and where solutions move downward. (c) On a third set of...
Consider the nonlinear System of differential equations di dt dt (a) Determine all critical points of the system (b) For each critical point with nonnegative x value (20) i. Determine the linearised system and discuss whether it can be used to approximate the ii. For each critical point where the approximation is valid, determine the general solution of iii. Sketch by hand the phase portrait of each linearised system where the approximation behaviour of the non-linear system the linearised system...
f
5. (See 2.5, 16) Two models used in population modeling are the Logistic equation and Gompertz equation: dy dt dy = (r-ay)y and where r,a>0 are constant dt a) For both, sketch the graph of f(y) versus y, find the critical points, and determine asymptotic stability. (b) For 0 y a, determine where the graph of y versus t is concave up and where it is concave down. (c) Sketch solution curves near critical points, discussing differences in the...
Using Differential
Equations.
6. For y, = y3 _ y, y(0) = 30, -00 <30 < 00, draw the graph of (y) = y3-y versus y, determine the equilibrium solutions (critical points) and classify each one as unstable or asymptotically stable. Draw the phase line, and sketch several representative integral curves (graphs of solutions) in the (t, y) plane. Hint: None of this requires explicit formulas for solutions y = φ(t) of the initial value problem.]
Task 8. (10+5+5 pt) The following nonlinear system X' = x3 – x, y = x – 5y has three critical points. The vector field appears below. (a) Find critical points and linearizations at critical points. Determine stability of critical points, (b) Sketch the phase portrait (feel free to use or not to use the provided vector field). (c) Can there be a solution of the system (x(t), y(t)) such that lim x(t) = 0? Explain your answer. t++ +...
1. The angular displacement e(t) of an undamped pendulum of length l swinging in a vertical plane under the influence of gravity can be modelled with the nonlinear second order ODE 0"(t) + "$(0(e) – Pef) = = 0, (1) where w2 = { (a) Re-write equation (1) as a system of first-order ODEs by defining (1 = 0(t) and 02 = 't). (b) Find the nullclines and equilibrium points for the system of first-order ODEs. (c) The first order...
6. [20 points] The following nonlinear differential equations describe the motion of a body in orbit around two much heavier bodies. An example would be an Apollo capsule in an Earth-moon orbit. The three bodies determine a two-dimensional Cartesian plane in space The origin is at the center of mass of the two heavy bodies, the r-axis is the line through these two bodies, and the distance between their centers is taken as the unit. Thus, if μ is the...
12. (8 points) A Graph Satisfying First and Second Derivative Conditions On the figure below, sketch the graph of a function y = f(x) that satisfies: • f(-2) = -3, • f is continuous • F"(x) > 0 on (-00, 2). • f is concave up for 1 > 2, and • lim f(1) = -2. • f'(2) does not exist. 00
What is the solution for this first order nonlinear differential equation of this SIR model with these initial conditions? S(t)=not infected individuals (1) l(t)- Currently Infected (588) R(t)- recovered individuals (0) This will be a nonlinear first order differential equation(ODE) dasi d/dt-sal-kt di/dt a (s-k/a) i dr/dt-ki Total population will be modeled by this equation consistent with the SlR model. d(S+l+R)/dt= -saltsal-kltkl-0 Solution: i stk/aln stK Model the topic using a differential equation. a) Draw any visuals (diagrams) that exemplify...
4 Consider the autonomous differential equation y f(v) a) (3 points) Find all the equilibrium solutions (critical points). b) (3 points) Use the sign of y f(z) to determine where solutions are increasing / decreasing. Sketch several solution curves in each region determined by the critical points in c) (3 points) the ty-plane. d) (3 points) Classify each equilibrium point as asymptotically stable, unstable, or semi-stable and draw the corresponding phase line.
4 Consider the autonomous differential equation y f(v)...
just (A) (B) (C)
3. Consider the system of differential equations = z+9-1 (a) Sketch the r-nullcline, where solutions must travel vertically. Identify the regions (b) On a separate set of axes, sketch the y-nullcline, where solutions must travel horizon in the plane where solutions will move toward the right, and where solutions move toward the right tally. Identify the regions in the plane where solutions will move upward, and where solutions move downward. (c) On a third set of...
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