1011 past contests
Topic 10 · Relationship between vapor pressure and boiling point (true/false)
Topic 30 · Mechanism and conditions of heat transfer by conduction (true/false)
Topic 34 · Mass of an incoming particle from a perfectly inelastic collision
Topic 63 · Fundamental frequency of a stretched string from wave speed and length
Topic 5 · Electric potential at the surface of a charged conducting sphere
Topic 20 · Number of neutrons in the product nuclide of a bombardment reaction
Topic 11 · Center of mass of a two-particle system from vector positions
Topic 42 · Capacitance required for a given rlc resonance frequency
Topic 48 · Riddle: refractive index
Topic 45 · Geometric properties of a convex mirror image (true/false)
Topic 36 · Conditions under which the friction force on an object is zero (true/false)
Topic 50 · Flight time of a projectile launched from level ground
Topic 21 · Photon energy from a hydrogen atom energy-level transition
Topic 43 · Parallel-plate capacitance from plate area, separation and dielectric constant
Topic 2 · Riddle: jupiter
Topic 45 · Concave mirror geometry when object and image distances are equal (true/false)
Topic 4 · Newton's first law in an inertial reference frame (true/false)
Topic 4 · Problem of the day: newton's first and second laws, and change in velocity from a constant force
Topic 3 · Work done by friction from energy conservation
Topic 3 · Kinetic energy of a particle from its vector velocity components