Phase Portrait
About points...
We associate a certain number of points with each exercise.
When you click an exercise into a collection, this number will be taken as points for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit the number of points for the exercise in the collection independently, without any effect on "points by default" as represented by the number here.
That being said... How many "default points" should you associate with an exercise upon creation?
As with difficulty, there is no straight forward and generally accepted way.
But as a guideline, we tend to give as many points by default as there are mathematical steps to do in the exercise.
Again, very vague... But the number should kind of represent the "work" required.
When you click an exercise into a collection, this number will be taken as points for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit the number of points for the exercise in the collection independently, without any effect on "points by default" as represented by the number here.
That being said... How many "default points" should you associate with an exercise upon creation?
As with difficulty, there is no straight forward and generally accepted way.
But as a guideline, we tend to give as many points by default as there are mathematical steps to do in the exercise.
Again, very vague... But the number should kind of represent the "work" required.
About difficulty...
We associate a certain difficulty with each exercise.
When you click an exercise into a collection, this number will be taken as difficulty for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit its difficulty in the collection independently, without any effect on the "difficulty by default" here.
Why we use chess pieces? Well... we like chess, we like playing around with \(\LaTeX\)-fonts, we wanted symbols that need less space than six stars in a table-column... But in your layouts, you are of course free to indicate the difficulty of the exercise the way you want.
That being said... How "difficult" is an exercise? It depends on many factors, like what was being taught etc.
In physics exercises, we try to follow this pattern:
Level 1 - One formula (one you would find in a reference book) is enough to solve the exercise. Example exercise
Level 2 - Two formulas are needed, it's possible to compute an "in-between" solution, i.e. no algebraic equation needed. Example exercise
Level 3 - "Chain-computations" like on level 2, but 3+ calculations. Still, no equations, i.e. you are not forced to solve it in an algebraic manner. Example exercise
Level 4 - Exercise needs to be solved by algebraic equations, not possible to calculate numerical "in-between" results. Example exercise
Level 5 -
Level 6 -
When you click an exercise into a collection, this number will be taken as difficulty for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit its difficulty in the collection independently, without any effect on the "difficulty by default" here.
Why we use chess pieces? Well... we like chess, we like playing around with \(\LaTeX\)-fonts, we wanted symbols that need less space than six stars in a table-column... But in your layouts, you are of course free to indicate the difficulty of the exercise the way you want.
That being said... How "difficult" is an exercise? It depends on many factors, like what was being taught etc.
In physics exercises, we try to follow this pattern:
Level 1 - One formula (one you would find in a reference book) is enough to solve the exercise. Example exercise
Level 2 - Two formulas are needed, it's possible to compute an "in-between" solution, i.e. no algebraic equation needed. Example exercise
Level 3 - "Chain-computations" like on level 2, but 3+ calculations. Still, no equations, i.e. you are not forced to solve it in an algebraic manner. Example exercise
Level 4 - Exercise needs to be solved by algebraic equations, not possible to calculate numerical "in-between" results. Example exercise
Level 5 -
Level 6 -
Question
Solution
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\(\LaTeX\)
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Exercise:
The figure shows the phase portrait for a two-dimensional system of linear differential s. center includegraphicswidthcm#image_path:phasportrait-# center Which of the following statements can be true? Give reasons for your answers also why a statement cannot be true. abcliste abc The eigenvalues are and . abc The eigenvalues are - and -. abc The eigenvalues are i and -i. abc The eigenvectors are vec v_ pmatrix pmatrix quad textrmand quad vec v_ pmatrix pmatrix abc The eigenvectors are vec v_ pmatrix - pmatrix quad textrmand quad vec v_ pmatrix pmatrix abcliste
Solution:
The fixed po at the origin is clearly stable so only b can be correct. a would be an unstable fixed po and c a centre. vspacemm The eigenvectors correspond to the straight line solutions. It is clear that they are in different quadrants see figure below so e can be true while d must be wrong. center includegraphicswidthcm#image_path:phasportrait-with-eigenvectors-# center
The figure shows the phase portrait for a two-dimensional system of linear differential s. center includegraphicswidthcm#image_path:phasportrait-# center Which of the following statements can be true? Give reasons for your answers also why a statement cannot be true. abcliste abc The eigenvalues are and . abc The eigenvalues are - and -. abc The eigenvalues are i and -i. abc The eigenvectors are vec v_ pmatrix pmatrix quad textrmand quad vec v_ pmatrix pmatrix abc The eigenvectors are vec v_ pmatrix - pmatrix quad textrmand quad vec v_ pmatrix pmatrix abcliste
Solution:
The fixed po at the origin is clearly stable so only b can be correct. a would be an unstable fixed po and c a centre. vspacemm The eigenvectors correspond to the straight line solutions. It is clear that they are in different quadrants see figure below so e can be true while d must be wrong. center includegraphicswidthcm#image_path:phasportrait-with-eigenvectors-# center
Meta Information
Exercise:
The figure shows the phase portrait for a two-dimensional system of linear differential s. center includegraphicswidthcm#image_path:phasportrait-# center Which of the following statements can be true? Give reasons for your answers also why a statement cannot be true. abcliste abc The eigenvalues are and . abc The eigenvalues are - and -. abc The eigenvalues are i and -i. abc The eigenvectors are vec v_ pmatrix pmatrix quad textrmand quad vec v_ pmatrix pmatrix abc The eigenvectors are vec v_ pmatrix - pmatrix quad textrmand quad vec v_ pmatrix pmatrix abcliste
Solution:
The fixed po at the origin is clearly stable so only b can be correct. a would be an unstable fixed po and c a centre. vspacemm The eigenvectors correspond to the straight line solutions. It is clear that they are in different quadrants see figure below so e can be true while d must be wrong. center includegraphicswidthcm#image_path:phasportrait-with-eigenvectors-# center
The figure shows the phase portrait for a two-dimensional system of linear differential s. center includegraphicswidthcm#image_path:phasportrait-# center Which of the following statements can be true? Give reasons for your answers also why a statement cannot be true. abcliste abc The eigenvalues are and . abc The eigenvalues are - and -. abc The eigenvalues are i and -i. abc The eigenvectors are vec v_ pmatrix pmatrix quad textrmand quad vec v_ pmatrix pmatrix abc The eigenvectors are vec v_ pmatrix - pmatrix quad textrmand quad vec v_ pmatrix pmatrix abcliste
Solution:
The fixed po at the origin is clearly stable so only b can be correct. a would be an unstable fixed po and c a centre. vspacemm The eigenvectors correspond to the straight line solutions. It is clear that they are in different quadrants see figure below so e can be true while d must be wrong. center includegraphicswidthcm#image_path:phasportrait-with-eigenvectors-# center
Contained in these collections
| Title | Matched on |
|---|---|
| Phase Portrait | tagstitle |
| Eigenvalues and Eigenvectors | tags |
| Initial Value Problem | tags |
| Strange Spring | tags |
| Overdamped Oscillation | tags |
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