Federico Serrano

Team Leader of Colombia

Problems graded	Report grade	Opposition grade	Review grade
15. Galileo method	5 (Italy)	6 (Ukraine)	5 (Netherlands)
7. Washboard roads	5 (Ukraine)	4 (Netherlands)	7 (Italy)
12. Inverse coffee cup vibration problem	6 (Netherlands)	6 (Italy)	8 (Ukraine)
5. Sparkler	7 (Sweden)	9 (Germany)	9 (Croatia)
11. Smashing Spheres	7 (Germany)	4 (Croatia)	8 (Sweden)
10. Droplet sandy fingerprints	5 (Croatia)	7 (Sweden)	7 (Germany)
6. Flat Earth	6 (Switzerland)	7 (Poland)	4 (Sweden)
13. Chaotic Magnetic Pendulum	8 (Poland)	8 (Sweden)	9 (Switzerland)
11. Smashing Spheres	7 (Sweden)	9 (Switzerland)	8 (Poland)
17. Resistor thermodynamics	9 (Switzerland)	9 (Brazil)	10 (France)
1. Physics of math	8 (Brazil)	7 (France)	9 (Switzerland)
10. Droplet sandy fingerprints	10 (France)	10 (Switzerland)	7 (Brazil)