2026
Hong Kong
- 1Rotating Cylindernot published
- 2Rods and Planesnot published
- 3Transmission Line Modellingnot published
- 4The Thermodynamic Helmholtz Resonatornot published
PPRDPhO Problems and Solutions
Run by HKUST since 2005 for secondary schools across the Pan Pearl River Delta, and sat simultaneously in Shenzhen, Hong Kong and Macau. Papers are bilingual in English and Chinese, and divided into a part of shorter problems and a part of two or three long ones.
2025
Hong Kong
- 1Rolling lollipop angular momentum*not published
- 2Laser tweezer forces on lenses*not published
- 3Toroidal confinement of charged particles*not published
- 4Harrison's Clock and Pendulum*not published
2024
Hong Kong
- 1Inhomogeneous cylinder oscillations*not published
- 2Three-chamber gas mixing*not published
- 3Charge in grounded spherical cavity*not published
- 4Melting ice hemisphere laser deflection*not published
2023
Hong Kong
- 1Solar-powered satellite plate*not published
- 2Binary suns with axial planet*not published
- 3Light torque on rotating rod*not published
- 4Piston oscillations in insulated cylinder*not published
2022
Hong Kong
- 1Block-spring on wedge*not published
- 2Three-level Boltzmann system*not published
- 3Wooden cylinder in two fluids*not published
- 4Four-plate capacitor network*not published
2021
Hong Kong
- 1Rod on counter-rotating rollers*not published
- 2Draining tank jet range*not published
- 3Rotating charged magnetized sphere*not published
- 4Atmospheric convection critical gradient*not published
2020
Hong Kong
- 1Gas expansion with piston*not published
- 2Dust particle accreting mist*not published
- 3Charged split metal sphere*not published
- 4Apparent inner radius of glass tube*not published
2019
Hong Kong
2018
Hong Kong
- 1Length of Daytimenot published
- 2Rotating Ballnot published
- 3Nearest Exoplanet Discoverednot published
- 4L-Shaped Conductor with a Wirenot published
- 5A Flying Square Loopnot published
- 6The Phenomenon of the Halonot published
2017
Hong Kong
- 1No-Shadow Daynot published
- 2Six Missilesnot published
- 3Falling laddernot published
- 4Photon Gasnot published
- 5Sea Surface Sound Transmissionnot published
- 6Electron Trajectory in a Cavitynot published
- 7Proton Motion Near a Charged Current-Carrying Wirenot published
2016
Hong Kong
- 1Electrostatic Forcenot published
- 2Capacitorsnot published
- 3Cannonballs and Bombsnot published
- 4Collisionsnot published
- 5Thermodynamic Cyclenot published
2015
Hong Kong
2014
Hong Kong
2013
Hong Kong
- 1Bead collides with rod*not published
- 2Binary star orbital motion*not published
- 3Charge in conducting shell*not published
- 4Apparent transverse speed of moving source*not published
- 5Pumping a flat tire*not published
- 6Inertia Inductance and Negative Refraction Mediumnot published
- 7Gravitational Wavesnot published
2012
Hong Kong
- 1Neutrino mass from speed bound*not published
- 2Pendulum with planar freedom*not published
- 3Satellite after radial impulse*not published
- 4Gyroscope precession angular velocity*not published
- 5Charge near grounded hemisphere*not published
- 6Piston expansion into vacuum*not published
- 7Stella Interferometernot published
- 8Y-Mesonnot published
- 9Penning Trapnot published
2011
Hong Kong
- 1Compound pendulum and charged cart*not published
- 2Electron momentum at three energies*not published
- 3Capacitance of parallel cylinders*not published
- 4Field energy density of sheets*not published
- 5Privacy screen working principle*not published
- 6Four-stroke cycle efficiency*not published
- 7Neutrino Oscillationnot published
- 8Bending Light with Gravitynot published
- 9Magnetic monopolesnot published
2010
Hong Kong
- 1Mixed short physics problems*not published
- 2Spacecraft orbit energy boost*not published
- 3Point source through plano-convex lens*not published
- 4Earth dipole field and wire force*not published
- 5Diesel cycle efficiency*not published
- 6Half disk flip impulse*not published
- 7Chain Reactionsnot published
- 8Quantum Gravitynot published
- 9The Sound of Bubblesnot published
2009
Hong Kong
- 1Resistance and capacitance of layered plates*not published
- 2Galaxy rotation curve exponent*not published
- 3Block-spring on moving wedge*not published
- 4Em wave in conducting medium*not published
- 5Non-ideal gas Carnot cycle*not published
- 6Early Solar Gas Distribution*not published
- 7Spin torque on wire*not published
- 8Nuclear magnetic resonance spin dynamics*not published
2008
Hong Kong
- 1Nuclear collision at right angle*not published
- 2Moving dielectric slab magnetic field*not published
- 3Spin and velocity alignment*not published
- 4Atmospheric pressure with wind*not published
- 5Rolling sphere over a ditch*not published
- 6Effective mass of spring-block system*not published
- 7Charged particle in radial magnetic field*not published
- 8Electric fan stopping time*not published
- 9Negative resistance device circuits*not published
2007
Hong Kong
- 1Weightless airplane trajectory*not published
- 2Two masses on swinging rod*not published
- 3Fields of magnetized disc and cylinder*not published
- 4Moving dielectric slab in magnetic field*not published
- 5Concentric shells with two media*not published
- 6Adiabatic atmosphere and rain*not published
- 7Torque on a medium by em wave*not published
- 8Folded space photon modes*not published
- 9Afm thermal noise resonance*not published
- 10Lorentz-Lorenz relation derivation*not published
2006
Hong Kong
- 1Electron-quark collision in meson*not published
- 2Pulley with adjustable magnets*not published
- 3Spinning vessel water pressure*not published
- 4Two-compartment gas heat exchange*not published
- 5Reflection at complex refractive index boundary*not published
- 6Casmir Effectnot published
- 7Electric Current Driven Magnetic Domain Movementnot published
- 8Force between a conductor sphere and a conductor planenot published
2005
Hong Kong
- 1Worms climbing over each other*not published
- 2Air bubble and tank rising*not published
- 3Stone-throwing man on rotating disk*not published
- 4Rod in a hemisphere*not published
- 5Em wave in complex medium*not published
- 6Coil falling through magnetic field*not published
- 7Hall and spin-Hall effect*not published
- 8Shear modulus of er fluid*not published