Rotierender Stab
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
Short
Video
\(\LaTeX\)
Need help? Yes, please!
The following quantities appear in the problem:
Länge \(\ell\) / Masse \(m\) / Energie \(E\) / Trägheitsmoment \(J, \Theta, I\) / Radius \(r\) / Winkelgeschwindigkeit / Kreisfrequenz \(\omega\) /
The following formulas must be used to solve the exercise:
\(E = \frac12 J\omega^2 \quad \) \(J_a = J_s + mr^2 \quad \) \(J = \frac{1}{12}m\ell^2 \quad \)
No explanation / solution video to this exercise has yet been created.
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Visit our YouTube-Channel to see solutions to other exercises.
Don't forget to subscribe to our channel, like the videos and leave comments!
Exercise:
Bei welcher Markierung müsste die Rotationsachse rechtwinklig zu einem Meterstab mit g Masse stehen damit letzterer bei einer Rotation um diese mit .Hz eine Rotationsenergie von J hätte?
Solution:
Die Rotationsenergie des Stabes bezüglich einer um a glqq verschobenengrqq Achse ist formal ausgedrückt: Erot frac Jomega^ frac leftfracmell^+ma^right pi f^ pi^f^m leftfracell^+a^right Aufgelöst nach der glqq Verschiebunggrqq a erhält man: a sqrtfracErotpi^f^m - fracell^ .m approx cm Die Achse müsste also wenn sie von der Mitte weg um cm verschoben werden muss bei der cm- oder cm-Markierung stehen.
Bei welcher Markierung müsste die Rotationsachse rechtwinklig zu einem Meterstab mit g Masse stehen damit letzterer bei einer Rotation um diese mit .Hz eine Rotationsenergie von J hätte?
Solution:
Die Rotationsenergie des Stabes bezüglich einer um a glqq verschobenengrqq Achse ist formal ausgedrückt: Erot frac Jomega^ frac leftfracmell^+ma^right pi f^ pi^f^m leftfracell^+a^right Aufgelöst nach der glqq Verschiebunggrqq a erhält man: a sqrtfracErotpi^f^m - fracell^ .m approx cm Die Achse müsste also wenn sie von der Mitte weg um cm verschoben werden muss bei der cm- oder cm-Markierung stehen.
Meta Information
Exercise:
Bei welcher Markierung müsste die Rotationsachse rechtwinklig zu einem Meterstab mit g Masse stehen damit letzterer bei einer Rotation um diese mit .Hz eine Rotationsenergie von J hätte?
Solution:
Die Rotationsenergie des Stabes bezüglich einer um a glqq verschobenengrqq Achse ist formal ausgedrückt: Erot frac Jomega^ frac leftfracmell^+ma^right pi f^ pi^f^m leftfracell^+a^right Aufgelöst nach der glqq Verschiebunggrqq a erhält man: a sqrtfracErotpi^f^m - fracell^ .m approx cm Die Achse müsste also wenn sie von der Mitte weg um cm verschoben werden muss bei der cm- oder cm-Markierung stehen.
Bei welcher Markierung müsste die Rotationsachse rechtwinklig zu einem Meterstab mit g Masse stehen damit letzterer bei einer Rotation um diese mit .Hz eine Rotationsenergie von J hätte?
Solution:
Die Rotationsenergie des Stabes bezüglich einer um a glqq verschobenengrqq Achse ist formal ausgedrückt: Erot frac Jomega^ frac leftfracmell^+ma^right pi f^ pi^f^m leftfracell^+a^right Aufgelöst nach der glqq Verschiebunggrqq a erhält man: a sqrtfracErotpi^f^m - fracell^ .m approx cm Die Achse müsste also wenn sie von der Mitte weg um cm verschoben werden muss bei der cm- oder cm-Markierung stehen.
Contained in these collections
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Rotierender Stab by TeXercises
| Title | Matched on |
|---|---|
| Länge eines rotierenden Stabes | tags |
| Rotorblätter eines Helikopters | tags |
| Rotierende Scheibe | tags |
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| Nachrichtensatellit | tags |
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