Freier Fall in der Nähe der Erdoberfläche
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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Exercise:
Im mitrotieren Bezugssystem vecy lässt man ein ruhes Objekt der Masse aus geringer Höhe h über dem Punkt Zürich fallen theta ang.. Wo trifft es auf der Erde auf? Wo trifft es auf der Erde auf? center tikzpicture coordinate O at ; coordinate A at ; coordinate B at . .; shadeball color blue! opacity . circle cm; draw color black! circle cm; draw color black! - arc :: and .; drawcolor black! dashed arc :: and .; fillfillblack circle pt; draw -latex -- nodeabovex_; draw color black! -- .. nodeabove; scopescale. draw -latex thick colorgreen!!black . . -- .. nodeabovey_; draw -latex thick colorgreen!!black rotate around-:. . . . -- .. noderighty_; draw -latex thick colorgreen!!black rotate around-:. . . . -- .. noderighty_; draw -latex thick coloryellow!!red rotate around-:. . . . -- .. noderightg; fillfillblack . . circle pt nodeaboveZ; scope draw scale. -latex color violet! -.. arc ::. and . noderight colorvioletomega; fillfillblack circle pt nodeleftO; pic draw colorblue "theta" angle eccentricity. angle B--O--A; tikzpicture center
Solution:
Schreiben vecg pmatrix -g pmatrix textSchwerebeschleunigung in vecy-Koordinaten vecomega pmatrix -omegasheta omegacostheta pmatrix textRotationsachse und -beschleunigung im vecy-Koordinaten. Nehmen an: Fallzeit t ll Tag d.h. omega t ll Longrightarrow Effekte der Ordnung omega^ und höher ignorieren. bf Bewegungsgleichungen? Vernachlässigbar: itemize item Zentrifugalkraft -mvecomegatimes vecomegatimes vecy Oomega^ item Eulerkraft -mdotvecomegatimes vecy vec da vecomegaconst. item Führungskraft vecma Oomega^ itemize cases ddotvecyvecg-vecomegatimes dotvecy+Oomega^ vecypmatrix h pmatrix dotvecyvec. cases Komponentenweise ausgeschrieben ergibt das: ddoty_omegacostheta doty_ ddoty_-omegacosthetadoty_-omegasheta doty_ ddoty_-g+omegasheta doty_ +Anfangsbedingungen Longrightarrow doty_t omegacostheta y_t Longrightarrow doty_t -gt+omegasheta y_t Longrightarrow ddoty_ -omega^y_+omega gtsheta mit Lösung y_t Acosomega t+Bsinomega t+fracgshetaomegat. Anfangsbedingungen y_doty_ ergeben A B-fracgshetaomega^ Longrightarrow y_t fracgshetaomegat-fracomegasinomega t fracgomegasheta t^+Oomega^ y_t Oomega^ y_t h-fracgt^+Oomega^ Longrightarrow Aufprall wenn y_T d.h. Tsqrtfrachg+Oomega^. Longrightarrow Ortsablenkung: y_Tfracsqrtfracomega h^fracg^fracsheta+Oomega^. Zürich hm: y_ &approx .millimeter m: y_ &approx .centimeter.
Im mitrotieren Bezugssystem vecy lässt man ein ruhes Objekt der Masse aus geringer Höhe h über dem Punkt Zürich fallen theta ang.. Wo trifft es auf der Erde auf? Wo trifft es auf der Erde auf? center tikzpicture coordinate O at ; coordinate A at ; coordinate B at . .; shadeball color blue! opacity . circle cm; draw color black! circle cm; draw color black! - arc :: and .; drawcolor black! dashed arc :: and .; fillfillblack circle pt; draw -latex -- nodeabovex_; draw color black! -- .. nodeabove; scopescale. draw -latex thick colorgreen!!black . . -- .. nodeabovey_; draw -latex thick colorgreen!!black rotate around-:. . . . -- .. noderighty_; draw -latex thick colorgreen!!black rotate around-:. . . . -- .. noderighty_; draw -latex thick coloryellow!!red rotate around-:. . . . -- .. noderightg; fillfillblack . . circle pt nodeaboveZ; scope draw scale. -latex color violet! -.. arc ::. and . noderight colorvioletomega; fillfillblack circle pt nodeleftO; pic draw colorblue "theta" angle eccentricity. angle B--O--A; tikzpicture center
Solution:
Schreiben vecg pmatrix -g pmatrix textSchwerebeschleunigung in vecy-Koordinaten vecomega pmatrix -omegasheta omegacostheta pmatrix textRotationsachse und -beschleunigung im vecy-Koordinaten. Nehmen an: Fallzeit t ll Tag d.h. omega t ll Longrightarrow Effekte der Ordnung omega^ und höher ignorieren. bf Bewegungsgleichungen? Vernachlässigbar: itemize item Zentrifugalkraft -mvecomegatimes vecomegatimes vecy Oomega^ item Eulerkraft -mdotvecomegatimes vecy vec da vecomegaconst. item Führungskraft vecma Oomega^ itemize cases ddotvecyvecg-vecomegatimes dotvecy+Oomega^ vecypmatrix h pmatrix dotvecyvec. cases Komponentenweise ausgeschrieben ergibt das: ddoty_omegacostheta doty_ ddoty_-omegacosthetadoty_-omegasheta doty_ ddoty_-g+omegasheta doty_ +Anfangsbedingungen Longrightarrow doty_t omegacostheta y_t Longrightarrow doty_t -gt+omegasheta y_t Longrightarrow ddoty_ -omega^y_+omega gtsheta mit Lösung y_t Acosomega t+Bsinomega t+fracgshetaomegat. Anfangsbedingungen y_doty_ ergeben A B-fracgshetaomega^ Longrightarrow y_t fracgshetaomegat-fracomegasinomega t fracgomegasheta t^+Oomega^ y_t Oomega^ y_t h-fracgt^+Oomega^ Longrightarrow Aufprall wenn y_T d.h. Tsqrtfrachg+Oomega^. Longrightarrow Ortsablenkung: y_Tfracsqrtfracomega h^fracg^fracsheta+Oomega^. Zürich hm: y_ &approx .millimeter m: y_ &approx .centimeter.
Meta Information
Exercise:
Im mitrotieren Bezugssystem vecy lässt man ein ruhes Objekt der Masse aus geringer Höhe h über dem Punkt Zürich fallen theta ang.. Wo trifft es auf der Erde auf? Wo trifft es auf der Erde auf? center tikzpicture coordinate O at ; coordinate A at ; coordinate B at . .; shadeball color blue! opacity . circle cm; draw color black! circle cm; draw color black! - arc :: and .; drawcolor black! dashed arc :: and .; fillfillblack circle pt; draw -latex -- nodeabovex_; draw color black! -- .. nodeabove; scopescale. draw -latex thick colorgreen!!black . . -- .. nodeabovey_; draw -latex thick colorgreen!!black rotate around-:. . . . -- .. noderighty_; draw -latex thick colorgreen!!black rotate around-:. . . . -- .. noderighty_; draw -latex thick coloryellow!!red rotate around-:. . . . -- .. noderightg; fillfillblack . . circle pt nodeaboveZ; scope draw scale. -latex color violet! -.. arc ::. and . noderight colorvioletomega; fillfillblack circle pt nodeleftO; pic draw colorblue "theta" angle eccentricity. angle B--O--A; tikzpicture center
Solution:
Schreiben vecg pmatrix -g pmatrix textSchwerebeschleunigung in vecy-Koordinaten vecomega pmatrix -omegasheta omegacostheta pmatrix textRotationsachse und -beschleunigung im vecy-Koordinaten. Nehmen an: Fallzeit t ll Tag d.h. omega t ll Longrightarrow Effekte der Ordnung omega^ und höher ignorieren. bf Bewegungsgleichungen? Vernachlässigbar: itemize item Zentrifugalkraft -mvecomegatimes vecomegatimes vecy Oomega^ item Eulerkraft -mdotvecomegatimes vecy vec da vecomegaconst. item Führungskraft vecma Oomega^ itemize cases ddotvecyvecg-vecomegatimes dotvecy+Oomega^ vecypmatrix h pmatrix dotvecyvec. cases Komponentenweise ausgeschrieben ergibt das: ddoty_omegacostheta doty_ ddoty_-omegacosthetadoty_-omegasheta doty_ ddoty_-g+omegasheta doty_ +Anfangsbedingungen Longrightarrow doty_t omegacostheta y_t Longrightarrow doty_t -gt+omegasheta y_t Longrightarrow ddoty_ -omega^y_+omega gtsheta mit Lösung y_t Acosomega t+Bsinomega t+fracgshetaomegat. Anfangsbedingungen y_doty_ ergeben A B-fracgshetaomega^ Longrightarrow y_t fracgshetaomegat-fracomegasinomega t fracgomegasheta t^+Oomega^ y_t Oomega^ y_t h-fracgt^+Oomega^ Longrightarrow Aufprall wenn y_T d.h. Tsqrtfrachg+Oomega^. Longrightarrow Ortsablenkung: y_Tfracsqrtfracomega h^fracg^fracsheta+Oomega^. Zürich hm: y_ &approx .millimeter m: y_ &approx .centimeter.
Im mitrotieren Bezugssystem vecy lässt man ein ruhes Objekt der Masse aus geringer Höhe h über dem Punkt Zürich fallen theta ang.. Wo trifft es auf der Erde auf? Wo trifft es auf der Erde auf? center tikzpicture coordinate O at ; coordinate A at ; coordinate B at . .; shadeball color blue! opacity . circle cm; draw color black! circle cm; draw color black! - arc :: and .; drawcolor black! dashed arc :: and .; fillfillblack circle pt; draw -latex -- nodeabovex_; draw color black! -- .. nodeabove; scopescale. draw -latex thick colorgreen!!black . . -- .. nodeabovey_; draw -latex thick colorgreen!!black rotate around-:. . . . -- .. noderighty_; draw -latex thick colorgreen!!black rotate around-:. . . . -- .. noderighty_; draw -latex thick coloryellow!!red rotate around-:. . . . -- .. noderightg; fillfillblack . . circle pt nodeaboveZ; scope draw scale. -latex color violet! -.. arc ::. and . noderight colorvioletomega; fillfillblack circle pt nodeleftO; pic draw colorblue "theta" angle eccentricity. angle B--O--A; tikzpicture center
Solution:
Schreiben vecg pmatrix -g pmatrix textSchwerebeschleunigung in vecy-Koordinaten vecomega pmatrix -omegasheta omegacostheta pmatrix textRotationsachse und -beschleunigung im vecy-Koordinaten. Nehmen an: Fallzeit t ll Tag d.h. omega t ll Longrightarrow Effekte der Ordnung omega^ und höher ignorieren. bf Bewegungsgleichungen? Vernachlässigbar: itemize item Zentrifugalkraft -mvecomegatimes vecomegatimes vecy Oomega^ item Eulerkraft -mdotvecomegatimes vecy vec da vecomegaconst. item Führungskraft vecma Oomega^ itemize cases ddotvecyvecg-vecomegatimes dotvecy+Oomega^ vecypmatrix h pmatrix dotvecyvec. cases Komponentenweise ausgeschrieben ergibt das: ddoty_omegacostheta doty_ ddoty_-omegacosthetadoty_-omegasheta doty_ ddoty_-g+omegasheta doty_ +Anfangsbedingungen Longrightarrow doty_t omegacostheta y_t Longrightarrow doty_t -gt+omegasheta y_t Longrightarrow ddoty_ -omega^y_+omega gtsheta mit Lösung y_t Acosomega t+Bsinomega t+fracgshetaomegat. Anfangsbedingungen y_doty_ ergeben A B-fracgshetaomega^ Longrightarrow y_t fracgshetaomegat-fracomegasinomega t fracgomegasheta t^+Oomega^ y_t Oomega^ y_t h-fracgt^+Oomega^ Longrightarrow Aufprall wenn y_T d.h. Tsqrtfrachg+Oomega^. Longrightarrow Ortsablenkung: y_Tfracsqrtfracomega h^fracg^fracsheta+Oomega^. Zürich hm: y_ &approx .millimeter m: y_ &approx .centimeter.
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