Erkundungsraumschiff
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:
Ein Raumschiff verlässt die Erde mit .c. Ein zweites kleines Erkundungsraumschiff verlässt das erste Raumschiff mit .c relativ dazu. Berechne die Geschwindigkeit dieses Erkundungsraumschiffes relativ zur Erde falls es abcliste abc in Richtung der Erde fliegt und abc in derselben Richtung wie das Raumschiff von der Erde wegfliegt. abcliste
Solution:
Wir legen die positive Richtung als diejenige fest in welcher das erste Raumschiff fliegt. Dann gilt: abcliste abc Die Situation sieht wie folgt aus: center tikzpicturescale. scope%Earth filldrawcolorblue fillblue!!white circle cm; drawcolorgreen!!black-latex --; drawcolorgreen!!black-latex --; nodecolorgreen!!black at .. mathcalS; drawcolorblue thickstealth- -.---. nodeleft v-.c; scope scopescale. xshiftcm yshiftcm %flaps coordinate P at --; drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scoperotate around:Pshift-cm-cmyscalexscal drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scope %rocket drawfillred!!white -- tooutin - tooutin tooutin --; %peak drawfillblue!!white -. tooutin . tooutin tooutin -.; %central flap drawfillblue!!white - tooutin - - tooutin -; %porthole drawcolorgrayultra thickfillwhite!!blue -. circle .cm; %fuel foreach i in ... pgfmathsetmacroxrand*. + *- - . pgfmathsetmacroyrand*. + *.-. pgfmathsetmacroopacValrand*.+ drawcolorred fillred!!yellow xy circle .cm; drawcolorgreen!!black-latex --; drawcolorgreen!!black-latex --; nodecolorgreen!!black at mathcalS'; drawcolorred thick stealth - --. noderight v.c; scope scopescale. xscal xshift-cm yshift-cm %flaps coordinate P at --; drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scoperotate around:Pshift-cm-cmyscalexscal drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scope %rocket drawfillyellow!!white -- tooutin - tooutin tooutin --; %peak drawfillblue!!white -. tooutin . tooutin tooutin -.; %central flap drawfillblue!!white - tooutin - - tooutin -; %porthole drawcolorgrayultra thickfillwhite!!blue -. circle .cm; %fuel foreach i in ... pgfmathsetmacroxrand*. + *- - . pgfmathsetmacroyrand*. + *.-. pgfmathsetmacroopacValrand*.+ drawcolorred fillred!!yellow xy circle .cm; drawcolorblue thickstealth- -- nodeleft u'-.c; drawcolorred thickstealth- ---- nodeleft u-.c; scope tikzpicture center Die Geschwindigkeit des zweiten Raumschiffs in diesem Fall +.c und -.c beträgt: u fracu'+v+fracvu'c^ -.c abc Die Situation sieht wie folgt aus: center tikzpicturescale. scope%Earth filldrawcolorblue fillblue!!white circle cm; drawcolorgreen!!black-latex --; drawcolorgreen!!black-latex --; nodecolorgreen!!black at .. mathcalS; drawcolorblue thickstealth- -.---. nodeleft v-.c; scope scopescale. xshiftcm yshiftcm %flaps coordinate P at --; drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scoperotate around:Pshift-cm-cmyscalexscal drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scope %rocket drawfillred!!white -- tooutin - tooutin tooutin --; %peak drawfillblue!!white -. tooutin . tooutin tooutin -.; %central flap drawfillblue!!white - tooutin - - tooutin -; %porthole drawcolorgrayultra thickfillwhite!!blue -. circle .cm; %fuel foreach i in ... pgfmathsetmacroxrand*. + *- - . pgfmathsetmacroyrand*. + *.-. pgfmathsetmacroopacValrand*.+ drawcolorred fillred!!yellow xy circle .cm; drawcolorgreen!!black-latex --; drawcolorgreen!!black-latex --; nodecolorgreen!!black at mathcalS'; drawcolorred thick stealth - --. noderight v.c; scope scopescale. xshiftcm yshift-cm %flaps coordinate P at --; drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scoperotate around:Pshift-cm-cmyscalexscal drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scope %rocket drawfillyellow!!white -- tooutin - tooutin tooutin --; %peak drawfillblue!!white -. tooutin . tooutin tooutin -.; %central flap drawfillblue!!white - tooutin - - tooutin -; %porthole drawcolorgrayultra thickfillwhite!!blue -. circle .cm; %fuel foreach i in ... pgfmathsetmacroxrand*. + *- - . pgfmathsetmacroyrand*. + *.-. pgfmathsetmacroopacValrand*.+ drawcolorred fillred!!yellow xy circle .cm; drawcolorblue thickstealth- -- noderight u'.c; drawcolorred thickstealth- ---- noderight u.c; scope tikzpicture center Im Bezugssystem der Erde fliegt das erste Raumschiff mit +.c und das zweite Raumschiff mit +.c. Somit beträgt die Geschwindigkeit des zweiten kleinen Raumschiffs relativ zur Erde: u fracu'+v+fracvu'c^ .c abcliste
Ein Raumschiff verlässt die Erde mit .c. Ein zweites kleines Erkundungsraumschiff verlässt das erste Raumschiff mit .c relativ dazu. Berechne die Geschwindigkeit dieses Erkundungsraumschiffes relativ zur Erde falls es abcliste abc in Richtung der Erde fliegt und abc in derselben Richtung wie das Raumschiff von der Erde wegfliegt. abcliste
Solution:
Wir legen die positive Richtung als diejenige fest in welcher das erste Raumschiff fliegt. Dann gilt: abcliste abc Die Situation sieht wie folgt aus: center tikzpicturescale. scope%Earth filldrawcolorblue fillblue!!white circle cm; drawcolorgreen!!black-latex --; drawcolorgreen!!black-latex --; nodecolorgreen!!black at .. mathcalS; drawcolorblue thickstealth- -.---. nodeleft v-.c; scope scopescale. xshiftcm yshiftcm %flaps coordinate P at --; drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scoperotate around:Pshift-cm-cmyscalexscal drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scope %rocket drawfillred!!white -- tooutin - tooutin tooutin --; %peak drawfillblue!!white -. tooutin . tooutin tooutin -.; %central flap drawfillblue!!white - tooutin - - tooutin -; %porthole drawcolorgrayultra thickfillwhite!!blue -. circle .cm; %fuel foreach i in ... pgfmathsetmacroxrand*. + *- - . pgfmathsetmacroyrand*. + *.-. pgfmathsetmacroopacValrand*.+ drawcolorred fillred!!yellow xy circle .cm; drawcolorgreen!!black-latex --; drawcolorgreen!!black-latex --; nodecolorgreen!!black at mathcalS'; drawcolorred thick stealth - --. noderight v.c; scope scopescale. xscal xshift-cm yshift-cm %flaps coordinate P at --; drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scoperotate around:Pshift-cm-cmyscalexscal drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scope %rocket drawfillyellow!!white -- tooutin - tooutin tooutin --; %peak drawfillblue!!white -. tooutin . tooutin tooutin -.; %central flap drawfillblue!!white - tooutin - - tooutin -; %porthole drawcolorgrayultra thickfillwhite!!blue -. circle .cm; %fuel foreach i in ... pgfmathsetmacroxrand*. + *- - . pgfmathsetmacroyrand*. + *.-. pgfmathsetmacroopacValrand*.+ drawcolorred fillred!!yellow xy circle .cm; drawcolorblue thickstealth- -- nodeleft u'-.c; drawcolorred thickstealth- ---- nodeleft u-.c; scope tikzpicture center Die Geschwindigkeit des zweiten Raumschiffs in diesem Fall +.c und -.c beträgt: u fracu'+v+fracvu'c^ -.c abc Die Situation sieht wie folgt aus: center tikzpicturescale. scope%Earth filldrawcolorblue fillblue!!white circle cm; drawcolorgreen!!black-latex --; drawcolorgreen!!black-latex --; nodecolorgreen!!black at .. mathcalS; drawcolorblue thickstealth- -.---. nodeleft v-.c; scope scopescale. xshiftcm yshiftcm %flaps coordinate P at --; drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scoperotate around:Pshift-cm-cmyscalexscal drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scope %rocket drawfillred!!white -- tooutin - tooutin tooutin --; %peak drawfillblue!!white -. tooutin . tooutin tooutin -.; %central flap drawfillblue!!white - tooutin - - tooutin -; %porthole drawcolorgrayultra thickfillwhite!!blue -. circle .cm; %fuel foreach i in ... pgfmathsetmacroxrand*. + *- - . pgfmathsetmacroyrand*. + *.-. pgfmathsetmacroopacValrand*.+ drawcolorred fillred!!yellow xy circle .cm; drawcolorgreen!!black-latex --; drawcolorgreen!!black-latex --; nodecolorgreen!!black at mathcalS'; drawcolorred thick stealth - --. noderight v.c; scope scopescale. xshiftcm yshift-cm %flaps coordinate P at --; drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scoperotate around:Pshift-cm-cmyscalexscal drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scope %rocket drawfillyellow!!white -- tooutin - tooutin tooutin --; %peak drawfillblue!!white -. tooutin . tooutin tooutin -.; %central flap drawfillblue!!white - tooutin - - tooutin -; %porthole drawcolorgrayultra thickfillwhite!!blue -. circle .cm; %fuel foreach i in ... pgfmathsetmacroxrand*. + *- - . pgfmathsetmacroyrand*. + *.-. pgfmathsetmacroopacValrand*.+ drawcolorred fillred!!yellow xy circle .cm; drawcolorblue thickstealth- -- noderight u'.c; drawcolorred thickstealth- ---- noderight u.c; scope tikzpicture center Im Bezugssystem der Erde fliegt das erste Raumschiff mit +.c und das zweite Raumschiff mit +.c. Somit beträgt die Geschwindigkeit des zweiten kleinen Raumschiffs relativ zur Erde: u fracu'+v+fracvu'c^ .c abcliste
Meta Information
Exercise:
Ein Raumschiff verlässt die Erde mit .c. Ein zweites kleines Erkundungsraumschiff verlässt das erste Raumschiff mit .c relativ dazu. Berechne die Geschwindigkeit dieses Erkundungsraumschiffes relativ zur Erde falls es abcliste abc in Richtung der Erde fliegt und abc in derselben Richtung wie das Raumschiff von der Erde wegfliegt. abcliste
Solution:
Wir legen die positive Richtung als diejenige fest in welcher das erste Raumschiff fliegt. Dann gilt: abcliste abc Die Situation sieht wie folgt aus: center tikzpicturescale. scope%Earth filldrawcolorblue fillblue!!white circle cm; drawcolorgreen!!black-latex --; drawcolorgreen!!black-latex --; nodecolorgreen!!black at .. mathcalS; drawcolorblue thickstealth- -.---. nodeleft v-.c; scope scopescale. xshiftcm yshiftcm %flaps coordinate P at --; drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scoperotate around:Pshift-cm-cmyscalexscal drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scope %rocket drawfillred!!white -- tooutin - tooutin tooutin --; %peak drawfillblue!!white -. tooutin . tooutin tooutin -.; %central flap drawfillblue!!white - tooutin - - tooutin -; %porthole drawcolorgrayultra thickfillwhite!!blue -. circle .cm; %fuel foreach i in ... pgfmathsetmacroxrand*. + *- - . pgfmathsetmacroyrand*. + *.-. pgfmathsetmacroopacValrand*.+ drawcolorred fillred!!yellow xy circle .cm; drawcolorgreen!!black-latex --; drawcolorgreen!!black-latex --; nodecolorgreen!!black at mathcalS'; drawcolorred thick stealth - --. noderight v.c; scope scopescale. xscal xshift-cm yshift-cm %flaps coordinate P at --; drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scoperotate around:Pshift-cm-cmyscalexscal drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scope %rocket drawfillyellow!!white -- tooutin - tooutin tooutin --; %peak drawfillblue!!white -. tooutin . tooutin tooutin -.; %central flap drawfillblue!!white - tooutin - - tooutin -; %porthole drawcolorgrayultra thickfillwhite!!blue -. circle .cm; %fuel foreach i in ... pgfmathsetmacroxrand*. + *- - . pgfmathsetmacroyrand*. + *.-. pgfmathsetmacroopacValrand*.+ drawcolorred fillred!!yellow xy circle .cm; drawcolorblue thickstealth- -- nodeleft u'-.c; drawcolorred thickstealth- ---- nodeleft u-.c; scope tikzpicture center Die Geschwindigkeit des zweiten Raumschiffs in diesem Fall +.c und -.c beträgt: u fracu'+v+fracvu'c^ -.c abc Die Situation sieht wie folgt aus: center tikzpicturescale. scope%Earth filldrawcolorblue fillblue!!white circle cm; drawcolorgreen!!black-latex --; drawcolorgreen!!black-latex --; nodecolorgreen!!black at .. mathcalS; drawcolorblue thickstealth- -.---. nodeleft v-.c; scope scopescale. xshiftcm yshiftcm %flaps coordinate P at --; drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scoperotate around:Pshift-cm-cmyscalexscal drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scope %rocket drawfillred!!white -- tooutin - tooutin tooutin --; %peak drawfillblue!!white -. tooutin . tooutin tooutin -.; %central flap drawfillblue!!white - tooutin - - tooutin -; %porthole drawcolorgrayultra thickfillwhite!!blue -. circle .cm; %fuel foreach i in ... pgfmathsetmacroxrand*. + *- - . pgfmathsetmacroyrand*. + *.-. pgfmathsetmacroopacValrand*.+ drawcolorred fillred!!yellow xy circle .cm; drawcolorgreen!!black-latex --; drawcolorgreen!!black-latex --; nodecolorgreen!!black at mathcalS'; drawcolorred thick stealth - --. noderight v.c; scope scopescale. xshiftcm yshift-cm %flaps coordinate P at --; drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scoperotate around:Pshift-cm-cmyscalexscal drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scope %rocket drawfillyellow!!white -- tooutin - tooutin tooutin --; %peak drawfillblue!!white -. tooutin . tooutin tooutin -.; %central flap drawfillblue!!white - tooutin - - tooutin -; %porthole drawcolorgrayultra thickfillwhite!!blue -. circle .cm; %fuel foreach i in ... pgfmathsetmacroxrand*. + *- - . pgfmathsetmacroyrand*. + *.-. pgfmathsetmacroopacValrand*.+ drawcolorred fillred!!yellow xy circle .cm; drawcolorblue thickstealth- -- noderight u'.c; drawcolorred thickstealth- ---- noderight u.c; scope tikzpicture center Im Bezugssystem der Erde fliegt das erste Raumschiff mit +.c und das zweite Raumschiff mit +.c. Somit beträgt die Geschwindigkeit des zweiten kleinen Raumschiffs relativ zur Erde: u fracu'+v+fracvu'c^ .c abcliste
Ein Raumschiff verlässt die Erde mit .c. Ein zweites kleines Erkundungsraumschiff verlässt das erste Raumschiff mit .c relativ dazu. Berechne die Geschwindigkeit dieses Erkundungsraumschiffes relativ zur Erde falls es abcliste abc in Richtung der Erde fliegt und abc in derselben Richtung wie das Raumschiff von der Erde wegfliegt. abcliste
Solution:
Wir legen die positive Richtung als diejenige fest in welcher das erste Raumschiff fliegt. Dann gilt: abcliste abc Die Situation sieht wie folgt aus: center tikzpicturescale. scope%Earth filldrawcolorblue fillblue!!white circle cm; drawcolorgreen!!black-latex --; drawcolorgreen!!black-latex --; nodecolorgreen!!black at .. mathcalS; drawcolorblue thickstealth- -.---. nodeleft v-.c; scope scopescale. xshiftcm yshiftcm %flaps coordinate P at --; drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scoperotate around:Pshift-cm-cmyscalexscal drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scope %rocket drawfillred!!white -- tooutin - tooutin tooutin --; %peak drawfillblue!!white -. tooutin . tooutin tooutin -.; %central flap drawfillblue!!white - tooutin - - tooutin -; %porthole drawcolorgrayultra thickfillwhite!!blue -. circle .cm; %fuel foreach i in ... pgfmathsetmacroxrand*. + *- - . pgfmathsetmacroyrand*. + *.-. pgfmathsetmacroopacValrand*.+ drawcolorred fillred!!yellow xy circle .cm; drawcolorgreen!!black-latex --; drawcolorgreen!!black-latex --; nodecolorgreen!!black at mathcalS'; drawcolorred thick stealth - --. noderight v.c; scope scopescale. xscal xshift-cm yshift-cm %flaps coordinate P at --; drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scoperotate around:Pshift-cm-cmyscalexscal drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scope %rocket drawfillyellow!!white -- tooutin - tooutin tooutin --; %peak drawfillblue!!white -. tooutin . tooutin tooutin -.; %central flap drawfillblue!!white - tooutin - - tooutin -; %porthole drawcolorgrayultra thickfillwhite!!blue -. circle .cm; %fuel foreach i in ... pgfmathsetmacroxrand*. + *- - . pgfmathsetmacroyrand*. + *.-. pgfmathsetmacroopacValrand*.+ drawcolorred fillred!!yellow xy circle .cm; drawcolorblue thickstealth- -- nodeleft u'-.c; drawcolorred thickstealth- ---- nodeleft u-.c; scope tikzpicture center Die Geschwindigkeit des zweiten Raumschiffs in diesem Fall +.c und -.c beträgt: u fracu'+v+fracvu'c^ -.c abc Die Situation sieht wie folgt aus: center tikzpicturescale. scope%Earth filldrawcolorblue fillblue!!white circle cm; drawcolorgreen!!black-latex --; drawcolorgreen!!black-latex --; nodecolorgreen!!black at .. mathcalS; drawcolorblue thickstealth- -.---. nodeleft v-.c; scope scopescale. xshiftcm yshiftcm %flaps coordinate P at --; drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scoperotate around:Pshift-cm-cmyscalexscal drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scope %rocket drawfillred!!white -- tooutin - tooutin tooutin --; %peak drawfillblue!!white -. tooutin . tooutin tooutin -.; %central flap drawfillblue!!white - tooutin - - tooutin -; %porthole drawcolorgrayultra thickfillwhite!!blue -. circle .cm; %fuel foreach i in ... pgfmathsetmacroxrand*. + *- - . pgfmathsetmacroyrand*. + *.-. pgfmathsetmacroopacValrand*.+ drawcolorred fillred!!yellow xy circle .cm; drawcolorgreen!!black-latex --; drawcolorgreen!!black-latex --; nodecolorgreen!!black at mathcalS'; drawcolorred thick stealth - --. noderight v.c; scope scopescale. xshiftcm yshift-cm %flaps coordinate P at --; drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scoperotate around:Pshift-cm-cmyscalexscal drawfillblue!!white - tooutin -. tooutin -. tooutin - -- -; scope %rocket drawfillyellow!!white -- tooutin - tooutin tooutin --; %peak drawfillblue!!white -. tooutin . tooutin tooutin -.; %central flap drawfillblue!!white - tooutin - - tooutin -; %porthole drawcolorgrayultra thickfillwhite!!blue -. circle .cm; %fuel foreach i in ... pgfmathsetmacroxrand*. + *- - . pgfmathsetmacroyrand*. + *.-. pgfmathsetmacroopacValrand*.+ drawcolorred fillred!!yellow xy circle .cm; drawcolorblue thickstealth- -- noderight u'.c; drawcolorred thickstealth- ---- noderight u.c; scope tikzpicture center Im Bezugssystem der Erde fliegt das erste Raumschiff mit +.c und das zweite Raumschiff mit +.c. Somit beträgt die Geschwindigkeit des zweiten kleinen Raumschiffs relativ zur Erde: u fracu'+v+fracvu'c^ .c abcliste
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