Jaan Kalda's competition, first run as a warm-up for IPhO 2012 and annual since 2017. One problem is released a month, and each week that passes without a solution publishes a further hint and lowers what the problem is worth.
2019
Online
Problems5 problems
1Added mass from polarizability*ProblemPhysics Cup 2019 problem 1, Added mass from polarizability
2Cooling part of ice*ProblemPhysics Cup 2019 problem 2, Cooling part of ice
3Foci of bouncing ball arcs*ProblemPhysics Cup 2019 problem 3, Foci of bouncing ball arcs
4Short-circuited resistor grid*ProblemPhysics Cup 2019 problem 4, Short-circuited resistor grid
5Checkerboard grating diffraction pattern*ProblemPhysics Cup 2019 problem 5, Checkerboard grating diffraction pattern
2018
Online
Problems5 problems
1Infinite resistor lattice bounds*ProblemPhysics Cup 2018 problem 1, Infinite resistor lattice bounds
2Catching missiles in accelerated ship*ProblemPhysics Cup 2018 problem 2, Catching missiles in accelerated ship
3Inductance of loop on ferromagnetic cylinder*ProblemPhysics Cup 2018 problem 3, Inductance of loop on ferromagnetic cylinder
4V-shaped vessel water oscillations*ProblemPhysics Cup 2018 problem 4, V-shaped vessel water oscillations
5Mean free path of black sphere*ProblemPhysics Cup 2018 problem 5, Mean free path of black sphere
2017
Online
Problems4 problems
1Charge and conducting disc force*ProblemPhysics Cup 2017 problem 1, Charge and conducting disc force
2Resistance of polygon network*ProblemPhysics Cup 2017 problem 2, Resistance of polygon network
3Adiabatic magnetic cycle of electron gas*ProblemPhysics Cup 2017 problem 3, Adiabatic magnetic cycle of electron gas
4Lens from image of circle*ProblemPhysics Cup 2017 problem 4, Lens from image of circle
Problem PDF:Problems PDF:Solution PDF:Solutions PDF:Marking scheme PDF:Marking scheme PDF:Problems and solutions PDF:Problems and solutions PDF:LaTeX source (.zip):LaTeX source (.zip):Add to list:More materials: