Consider the ODE dy/dt = -y(1-(y/T))(1-(y/K)) where 0 < T < K. (a) Draw a phase line and determine the stability o...
Consider the ODE
dy/dt = -y(1-(y/T))(1-(y/K))
where 0 < T < K.
(a) Draw a phase line and determine the stability of each equilibrium point.
(b) Draw a graph in the yt-plane showing several solutions and
their long term behavior. (Remark:
Solving this ODE isn’t necessary!)
Homework Answers
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Consider the ODE dy/dt = -y(1-(y/T))(1-(y/K)) where 0 < T < K. (a) Draw a phase line and determine the stability o...
Consider the autonomous differential equation dy dt = = y(k - y), t> 0, k >...
Consider the autonomous differential equation dy dt = = y(k - y), t> 0, k > 0 (i) list the critical points (ii) sketch the phase line and classify the critical points according to their stability (iii) Determine where y is concave up and concave down (iv) sketch several solution curves in the ty-plane.
2. Consider the systems: dz =2x(1-5)-yr dt dy dt a) Which system corresponds to a predator-prey o...
2. Consider the systems: dz =2x(1-5)-yr dt dy dt a) Which system corresponds to a predator-prey one? Which is the predator and which the prey? Briefly justify your answer. b) Find the equilibrium solutions only for the predator-prey one. c) Sketch its phase plane showing the equilibrium solutions and the behavior on the r- and y-axis (only for the predator-prey one) d) Describe briefly what kind of situation could the other system represent.
2. Consider the systems: dz =2x(1-5)-yr dt...
Consider the following system: dx/dt=y(x^2+y^2-1) dy/dt= -x(x^2 +y^2-1) Find the equilibrium solution. 13. Consider the following system dx dy (e) Find the equilibrium solutions (0 Use Maple to sk...
Consider the following system:
dx/dt=y(x^2+y^2-1)
dy/dt= -x(x^2 +y^2-1)
Find the equilibrium solution.
13. Consider the following system dx dy (e) Find the equilibrium solutions (0 Use Maple to sketch a phase portrait (me to understand the qualitative behavior of
13. Consider the following system dx dy (e) Find the equilibrium solutions (0 Use Maple to sketch a phase portrait (me to understand the qualitative behavior of
dy -X dx2 dt =2y-x dt 2. Consider the following system of equations: phase plane, showing...
dy -X dx2 dt =2y-x dt 2. Consider the following system of equations: phase plane, showing only the first quadrant. (a) Graph the nullclines on a (b) Find the fixed points (there are two) to determine the nature of each fixed point (i.e., source, sink, saddle, and (c) Use Jacobian analysis whether it is a node or spiral). (d) Draw the flow arrows in each region of your phase plane from part (a). You may use a computer to help...
dr Consider the system: = 4x – 2y dy = x + y dt (a) Determine...
dr Consider the system: = 4x – 2y dy = x + y dt (a) Determine the type of the equilibrium point at the origin. (35 points) (b) Find all straight-line solutions and draw the phase portrait for the system. (35 points) (c) What is the general solution to the system? (15 points) (d) Find the solution of the system with initial conditions: x(0) = 1 and y(0) = -1. (15 points)
dy 3. (5 points): Consider the autonomous differential equation dt is given below. Draw the phase...
dy 3. (5 points): Consider the autonomous differential equation dt is given below. Draw the phase line and classify the equilibria. f(y) where the graph of f(y) Y 1 -0.5 0.5 1 y
Determine the equilibrium, classify each equilibrium, draw a phase line. If y(0)=1 then lim y(t) = ? If y(0)=2 then what is the solution y(t) =? 3/3-4y Let dt 3/3-4y Let dt
Determine the equilibrium, classify each equilibrium, draw a
phase line.
If y(0)=1 then lim y(t) = ?
If y(0)=2 then what is the solution y(t) =?
3/3-4y Let dt
3/3-4y Let dt
only full solution for c and d In a simplified model of tumour growth, the size y(t) of the tumour at time t is given by...
only
full solution for c and d
In a simplified model of tumour growth, the size y(t) of the tumour at time t is given by the equation dy y dt (1-2) is the proliferation rate of the tumour where r and k are positive constants and dy versus y, clearly labelling any equilibrium solutions dt (a) Draw the phase plot (b) Sketch y(t) for sufficiently many initial conditions to display all different basic shapes for the tumour size vs....
Consider the family of differential equations dy/dx=y^3+ky+k^2 Are there any equilibrium solutions when k=0? Draw bifurcation...
Consider the family of differential equations dy/dx=y^3+ky+k^2 Are there any equilibrium solutions when k=0? Draw bifurcation diagram Draw phase diagram for when k=1/2 Does limit exist when k=1/2 and y(0)=0
Consider an autonomous ODE y = f(y) where f(y) = y2 - 1 A. (1 pt)...
Consider an autonomous ODE y = f(y) where f(y) = y2 - 1 A. (1 pt) Draw the graph of function f(y) in the y,y plane and specify the points y where f(y) is singular (that is, f(y) takes an infinite value). B. (1 pt) Finf the equilibrium solution and determine its type: stable, un- stable or semi-stable. Indicate on which side it attracts/repels nearby solutions. C. (2 pt) By separating y and t, specify the general solution y=yt,C) t+C...
Consider the autonomous differential equation dy dt = = y(k - y), t> 0, k > 0 (i) list the critical points (ii) sketch the phase line and classify the critical points according to their stability (iii) Determine where y is concave up and concave down (iv) sketch several solution curves in the ty-plane.
2. Consider the systems: dz =2x(1-5)-yr dt dy dt a) Which system corresponds to a predator-prey one? Which is the predator and which the prey? Briefly justify your answer. b) Find the equilibrium solutions only for the predator-prey one. c) Sketch its phase plane showing the equilibrium solutions and the behavior on the r- and y-axis (only for the predator-prey one) d) Describe briefly what kind of situation could the other system represent.
2. Consider the systems: dz =2x(1-5)-yr dt...
Consider the following system:
dx/dt=y(x^2+y^2-1)
dy/dt= -x(x^2 +y^2-1)
Find the equilibrium solution.
13. Consider the following system dx dy (e) Find the equilibrium solutions (0 Use Maple to sketch a phase portrait (me to understand the qualitative behavior of
13. Consider the following system dx dy (e) Find the equilibrium solutions (0 Use Maple to sketch a phase portrait (me to understand the qualitative behavior of
dy -X dx2 dt =2y-x dt 2. Consider the following system of equations: phase plane, showing only the first quadrant. (a) Graph the nullclines on a (b) Find the fixed points (there are two) to determine the nature of each fixed point (i.e., source, sink, saddle, and (c) Use Jacobian analysis whether it is a node or spiral). (d) Draw the flow arrows in each region of your phase plane from part (a). You may use a computer to help...
dr Consider the system: = 4x – 2y dy = x + y dt (a) Determine the type of the equilibrium point at the origin. (35 points) (b) Find all straight-line solutions and draw the phase portrait for the system. (35 points) (c) What is the general solution to the system? (15 points) (d) Find the solution of the system with initial conditions: x(0) = 1 and y(0) = -1. (15 points)
dy 3. (5 points): Consider the autonomous differential equation dt is given below. Draw the phase line and classify the equilibria. f(y) where the graph of f(y) Y 1 -0.5 0.5 1 y
Determine the equilibrium, classify each equilibrium, draw a
phase line.
If y(0)=1 then lim y(t) = ?
If y(0)=2 then what is the solution y(t) =?
3/3-4y Let dt
3/3-4y Let dt
only
full solution for c and d
In a simplified model of tumour growth, the size y(t) of the tumour at time t is given by the equation dy y dt (1-2) is the proliferation rate of the tumour where r and k are positive constants and dy versus y, clearly labelling any equilibrium solutions dt (a) Draw the phase plot (b) Sketch y(t) for sufficiently many initial conditions to display all different basic shapes for the tumour size vs....
Consider the family of differential equations dy/dx=y^3+ky+k^2 Are there any equilibrium solutions when k=0? Draw bifurcation diagram Draw phase diagram for when k=1/2 Does limit exist when k=1/2 and y(0)=0
Consider an autonomous ODE y = f(y) where f(y) = y2 - 1 A. (1 pt) Draw the graph of function f(y) in the y,y plane and specify the points y where f(y) is singular (that is, f(y) takes an infinite value). B. (1 pt) Finf the equilibrium solution and determine its type: stable, un- stable or semi-stable. Indicate on which side it attracts/repels nearby solutions. C. (2 pt) By separating y and t, specify the general solution y=yt,C) t+C...
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