1011 past contests
Topic 5 · Riddle: electricity, phenomena of charged particles named after the electron/beta particle
Topic 19 · Half-life from a specimen's activity decreasing 64x in a given time
Topic 63 · Tension in a string from its fundamental frequency, length and linear density
Topic 21 · Photon energy from an atomic transition between two given energy levels
Topic 36 · Normal force on an inclined plane, fn=w cosθ, 8.0n/30°
Topic 19 · Decay time from initial and final mass given a half-life, 2.3min half-life
Topic 5 · Charge on a spherical conductor from its radius and surface potential
Topic 10 · Riddle: an ideal gas, of non-interacting particles undergoing elastic collisions
Topic 34 · True or false: impulse from a 20kg object's speed change 20→30m/s equals 1000n·s
Topic 34 · True or false: impulse from a 20kg object's speed change 20→30m/s equals 200n·s
Topic 34 · True or false: impulse from a 20kg object's speed change 20→30m/s equals 600n·s
Topic 10 · True or false: at absolute zero, the total energy of a fixed quantity of gas is minimum
Topic 10 · True or false: at absolute zero, the total energy of a fixed quantity of gas is zero
Topic 10 · True or false: at absolute zero, a fixed quantity of an object has zero volume
Topic 3 · Change in kinetic energy sliding down a smooth incline, via the work-energy theorem
Topic 34 · Velocity of an object from mass and a linear momentum vector
Topic 14 · Mass of a homogeneous object from density and volume
Topic 34 · Mass from kinetic energy and momentum magnitude, variant 24j/12ns
Topic 34 · Kinetic energy from momentum magnitude and mass
Topic 11 · Riddle: moment of inertia, the rotational analog of mass