1011 past contests
Topic 39 · Problem of the day: transformer turns ratio, voltage and current
Topic 34 · Linear momentum of an object from its velocity vector
Topic 42 · Impedance of a series rl circuit
Topic 3 · Kinetic energy gained from a decrease in potential energy
Topic 13 · Back emf and running current in a dc motor
Topic 34 · Impulse and average force from a change in vector momentum
Topic 20 · Identifying nuclides from beta decay, positron decay and electron capture
Topic 6 · Riddle: amplitude of a vibrating system
Topic 52 · Riddle: velocity as the rate of change of displacement
Topic 12 · Propagating relative uncertainty through a product or power
Topic 13 · Riddle: kirchhoff's current law
Topic 19 · Half-life from a ratio of activities
Topic 36 · Normal force on an object resting on an inclined plane
Topic 25 · Classifying particles as baryons, leptons or mesons
Topic 22 · Relativistic linear momentum of a fast electron
Topic 12 · Apparent magnitude as a measure of brightness
Topic 16 · Rise in liquid level from a submerged object's volume
Topic 41 · Combined electric and magnetic (lorentz) force on a charge
Topic 26 · X-ray photon energy from characteristic wavelength
Topic 40 · Electrical characteristics of an ideal operational amplifier