Colombian Physicist’ Tournament 2022

DRAW PROCEDURE RESULTS

PF 1A9:00 AM zoom linkANDESUN-BOG
PF 1B9:00 AM zoom linkUPNUIS
PF 2A2:00 PMzoom linkANDESUPN
PF 2B2:00 PMzoom linkUN-BOGUIS
Teams’ layout

FINAL

Chairperson: Carolina Camargo
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SP
UIS
UN-BOG
Final results
ProblemReporterScoreOpponentScore
Ferrofluidic patternUISUN-BOG
Galileo methodUN-BOGUIS
Final

Selective Fights Ranking

Universidad Industrial de Santander ☆☆80.33
Universidad Nacional de Colombia-Bogotá ☆71.50
Universidad de los Andes ☆☆57.08
Universidad Pedagógica Nacional51.54
Final ranking

PF 1A

Chairperson: María Camila Díaz
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ProblemReporterOpponent
Filled BallANDESUN-BOG
Galileo methodUN-BOGANDES
PF 1A Rounds
TeamReporterOpponentSP
ANDES15.751328.75
UN-BOG19.51334.50
PF 1A Scores

PF 1B

Chairpereson: Carolina Camargo
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ProblemReporterOpponent
Flat EarthUPNUIS
Smashing SpheresUISUPN
PF 1B Rounds
TeamReporterOpponentSP
UPN17.008.6725.67
UIS25.0014.0041.00
PF 1B Scores

PF 2A

Chairperson: María Camila Díaz
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ProblemReporterOpponent
Galileo methodUPNANDES
Inverse coffee cup vibration problemANDESUPN
PF 2A Rounds
TeamReporterOpponentSP
ANDES15.0013.3330.33
UPN13.8712.0025.87
PF 2A Scores

PF 2B

Chairperson: Carolina Camargo
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ProblemReporterOpponent
Inverse coffee cup vibration problemUISUN-BOG
Filled BallUN-BOGUIS
PF 2B Rounds
TeamReporterOpponentSP
UN-BOG21.0016.0037.00
UIS22.0015.3339.33
PF 2A Scores

Problems

4. Filled Ball
A ping-pong ball that has been partially filled with some fluid or sand will bounce much lower than a filled one. Explain this phenomenon. How does the height of the bounce depend on the relevant parameters?

6. Flat Earth
Propose an experiment using only a camera and/or the sensors of your smartphone to prove or disprove the flat Earth hypothesis. Using the same equipment, estimate the size of the Earth with as high accuracy as possible.

8. Ferrofluidic patterns
When a ferrofluid is placed in a rotating magnetic field, strange patterns may appear. Investigate the shape of these patterns and characterize them in terms of the relevant parameters.

11. Smashing spheres
Smashing two steel spheres together with a paper in between at the point of collision, produces enough heat that it burns off the paper. Conducting the same experiment with aluminum foil, you will observe concentric rings on the foil after collision. Study this phenomenon. Can it be observed for other materials?

12. Inverse coffee cup vibration problem
If you tap the top of a coffee cup with a spoon you will notice that the sound strongly depends on where you tap. Knowing the cup geometry one can predict the frequency spectrum of the emitted sound when tapping at different points. Consider now the inverse problem and find an experimental technique to reconstruct the cup geometry from the emitted sound. What is the minimal knowledge about the cup geometry needed to make the problem solvable?

15. Galileo method
What is the maximum height a piece of chalk might be dropped without breaking for a given surface? Which parameters does the height depend on? Are there any dropping or throwing techniques which minimize the breakage probability?