IPT 2015 : les problèmes de la sélection nationale

Choix des problèmes pour la sélection nationale

La liste des 8 problèmes est choisie par l’IOC. Elle est représentative de l’ensemble des thèmes scientifiques et méthodologiques abordés par le tournoi.
ˆCompte tenu des délais de préparation, il est possible de présenter des travaux encore en cours de préparation ou d’élaboration.

Liste des problèmes pour la sélection nationale

Télécharger la liste complète ici.

Vortex cannon (problem 2)

Vortex cannons can be easily constructed to create smoke/air rings (see video). What factors influence the range of the rings? How can this range be maximized?

Wet rocks (problem 3)

It’s well known that many materials (asphalt, cloth, etc.) change their color on wetting. Describe the processes that lead to such a spectrum change for reflected (or transmitted) light. What properties of the material/liquid influence the process and how?

Tuning fork connection (problem 4)

Develop a setup for data transmission that uses tuning forks as the transmitter and receiver. The tuning forks should be 440 Hz and may include a resonator and small features to change the frequency. How does the maximum data transmission rate depend on the distance between the forks?

Superconductivity” (problem 6)

There exists a phenomenon where neodymium magnets levitate a round graphite plate at room temperature (see video). Explain the effect. Propose a setup with minimal mass that will stably levitate a 1 g graphite plate.

Lifter (problem 11)

Construct the most powerful Lifter possible with the surface area below 0.1 m2. Link.

The angry salt (problem 12)

When sea salt is heated in frying pan it begins hissing and jumping. Explain this phenomenon. Find the relationship between the distribution of salt grains and the jumping height.

Curly ribbon (problem 15)

Why do ribbons curl after being scored with a blade? What is the typical size of the curl? How do the ribbons parameters influence the effect?

Beer battle (problem 17)

If you tap a beer bottle with the bottom of another one, the beer will spill out like a geyser. Explain this phenomenon and estimate the amount of liquid that can be removed from the bottle via this method. What are the important parameters for this effect to occur?

IPT 2015 : les problèmes de la sélection nationale