1011 past contests
Topic 62 · Beat frequency from two sound sources of slightly different frequency
Topic 18 · Work function of a photocathode from photon energy and maximum photoelectron kinetic energy
Topic 42 · Rms current or voltage in an ac circuit from its impedance magnitude (v=iz)
Topic 3 · Gravitational potential energy of an object at a given height ($PE = mgh$)
Topic 41 · Riddle: geomagnetic isocline (line of equal magnetic inclination)
Topic 5 · Solving for potential, charge or radius of an isolated conducting sphere using $V = \dfrac{kQ}{r}$
Topic 21 · Photon energy from a hydrogen atom energy-level transition
Topic 11 · Rotational kinetic energy of a solid cylinder spinning about its axis
Topic 16 · Continuity equation: flow speed in a pipe of different diameter for an incompressible fluid
Topic 21 · The zeeman effect: splitting of spectral lines in a magnetic field
Topic 49 · Thin-film interference as the cause of iridescent heat-tint colours on oxidised steel
Topic 61 · Center of oscillation of a solid sphere swinging as a physical pendulum about a point on its surface
Topic 17 · Apparent magnitude as a measure of brightness, and ranking objects by increasing brightness
Topic 25 · Classifying particles as baryons, leptons or mesons
Topic 13 · Electromotive force (emf) and internal resistance
Topic 50 · Range of a projectile from its launch angle and speed, applied in three related problems (forward and inverse)
Topic 42 · Power factor of a series rl circuit from resistance and inductive reactance
Topic 46 · Focal length of a thin plano-concave lens from its radius of curvature and refractive index
Topic 20 · Electrons in a neutral atom before electron capture, from the daughter nuclide's atomic number
Topic 5 · Number of excess protons on a charged conducting sphere from its surface potential