Eis schmelzen mit Kupferstab
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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Video
\(\LaTeX\)
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Exercise:
Ein massiver Kupferstab wattperkelvinpermeter mit .centimetersquared Querschnitt wird am oberen Ende geheizt und konstant auf K gehalten; das untere Ende wird in schmelzes Eis eingetaucht. Die freie Stablänge zwischen Heizung und Eis beträgt cm. Wie viel Eis bei degreeCelsius kann mit dieser Anordnung in min maximal geschmolzen werden?
Solution:
NewQtyLwattperkelvinpermeter NewQtyAo.squarecentimeter NewQtyA.squaremeter NewQtyTwK WaermeEis NewQtydcmm NewQtyTkocelsius NewQtyTk.K NewQtytomin NewQtyts % Geg lambda L A Ao A sscTw Tw textEisrightarrowsscLf LfEi d dO d sscTk Tko Tk t to t % GesMasse des Eisesm sikg % Der Wärmestrom durch den Kupferstab beträgt SolQtyPlambdafracsscTw-sscTkd ALX*TwX-TkX/dX*AXW al varPhi J A PF LfracTw-TkdA P. % Die in to gelieferte Wärmemenge beträgt damit SolQtyQPF tPX*tXJ al Q P t QF Pt Q. % Mit dieser Wärmemenge lassen sich SolQtymlambdafracsscTw-sscTkd fracAtsscLfQX/LfEinkg al m fracQsscLf mF fracQLfEi m Eis schmelzen. % m mF mP
Ein massiver Kupferstab wattperkelvinpermeter mit .centimetersquared Querschnitt wird am oberen Ende geheizt und konstant auf K gehalten; das untere Ende wird in schmelzes Eis eingetaucht. Die freie Stablänge zwischen Heizung und Eis beträgt cm. Wie viel Eis bei degreeCelsius kann mit dieser Anordnung in min maximal geschmolzen werden?
Solution:
NewQtyLwattperkelvinpermeter NewQtyAo.squarecentimeter NewQtyA.squaremeter NewQtyTwK WaermeEis NewQtydcmm NewQtyTkocelsius NewQtyTk.K NewQtytomin NewQtyts % Geg lambda L A Ao A sscTw Tw textEisrightarrowsscLf LfEi d dO d sscTk Tko Tk t to t % GesMasse des Eisesm sikg % Der Wärmestrom durch den Kupferstab beträgt SolQtyPlambdafracsscTw-sscTkd ALX*TwX-TkX/dX*AXW al varPhi J A PF LfracTw-TkdA P. % Die in to gelieferte Wärmemenge beträgt damit SolQtyQPF tPX*tXJ al Q P t QF Pt Q. % Mit dieser Wärmemenge lassen sich SolQtymlambdafracsscTw-sscTkd fracAtsscLfQX/LfEinkg al m fracQsscLf mF fracQLfEi m Eis schmelzen. % m mF mP
Meta Information
Exercise:
Ein massiver Kupferstab wattperkelvinpermeter mit .centimetersquared Querschnitt wird am oberen Ende geheizt und konstant auf K gehalten; das untere Ende wird in schmelzes Eis eingetaucht. Die freie Stablänge zwischen Heizung und Eis beträgt cm. Wie viel Eis bei degreeCelsius kann mit dieser Anordnung in min maximal geschmolzen werden?
Solution:
NewQtyLwattperkelvinpermeter NewQtyAo.squarecentimeter NewQtyA.squaremeter NewQtyTwK WaermeEis NewQtydcmm NewQtyTkocelsius NewQtyTk.K NewQtytomin NewQtyts % Geg lambda L A Ao A sscTw Tw textEisrightarrowsscLf LfEi d dO d sscTk Tko Tk t to t % GesMasse des Eisesm sikg % Der Wärmestrom durch den Kupferstab beträgt SolQtyPlambdafracsscTw-sscTkd ALX*TwX-TkX/dX*AXW al varPhi J A PF LfracTw-TkdA P. % Die in to gelieferte Wärmemenge beträgt damit SolQtyQPF tPX*tXJ al Q P t QF Pt Q. % Mit dieser Wärmemenge lassen sich SolQtymlambdafracsscTw-sscTkd fracAtsscLfQX/LfEinkg al m fracQsscLf mF fracQLfEi m Eis schmelzen. % m mF mP
Ein massiver Kupferstab wattperkelvinpermeter mit .centimetersquared Querschnitt wird am oberen Ende geheizt und konstant auf K gehalten; das untere Ende wird in schmelzes Eis eingetaucht. Die freie Stablänge zwischen Heizung und Eis beträgt cm. Wie viel Eis bei degreeCelsius kann mit dieser Anordnung in min maximal geschmolzen werden?
Solution:
NewQtyLwattperkelvinpermeter NewQtyAo.squarecentimeter NewQtyA.squaremeter NewQtyTwK WaermeEis NewQtydcmm NewQtyTkocelsius NewQtyTk.K NewQtytomin NewQtyts % Geg lambda L A Ao A sscTw Tw textEisrightarrowsscLf LfEi d dO d sscTk Tko Tk t to t % GesMasse des Eisesm sikg % Der Wärmestrom durch den Kupferstab beträgt SolQtyPlambdafracsscTw-sscTkd ALX*TwX-TkX/dX*AXW al varPhi J A PF LfracTw-TkdA P. % Die in to gelieferte Wärmemenge beträgt damit SolQtyQPF tPX*tXJ al Q P t QF Pt Q. % Mit dieser Wärmemenge lassen sich SolQtymlambdafracsscTw-sscTkd fracAtsscLfQX/LfEinkg al m fracQsscLf mF fracQLfEi m Eis schmelzen. % m mF mP
Contained in these collections
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Wärmeleitung by uz
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Wärmeleitung by pw
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Wärmetransport by aej