1011 past contests
Topic 11 · Riddle: moment of inertia, the rotational analog of mass
Topic 1 · True or false: constant speed, constant velocity and constant acceleration in a plane
Topic 27 · True or false: the same heat engine's thermal efficiency cannot exceed 40%
Topic 27 · True or false: a heat engine between 27°c and 227°c has efficiency at most 200/227
Topic 10 · True or false: the heat rejected exceeds the useful work done for this engine
Topic 46 · Lens power: reciprocal of focal length, combined lenses, and sign convention (true/false)
Topic 43 · Current through a capacitor from dv/dt, i=c(dv/dt)
Topic 3 · Kinetic energy from total mechanical energy and potential energy
Topic 50 · Horizontal range of a projectile at 30° above the horizontal, 49m/s
Topic 34 · Common speed after a perfectly inelastic collision, given initial speed
Topic 34 · Initial speed for a perfectly inelastic collision to reach a target common speed
Topic 34 · Kinetic energy from mass and a momentum vector's magnitude
Topic 11 · True or false: torque is the rate of change of angular momentum
Topic 34 · True or false: force is the rate of change of linear momentum
Topic 10 · True or false: the rate of change of pressure equals energy density
Topic 14 · Riddle: ice, a solid less dense than its liquid form
Topic 16 · True or false: pascal's principle explains why water and ethanol form a homogeneous mixture
Topic 16 · True or false: pascal's principle only applies to objects that float
Topic 16 · True or false: pascal's principle only applies to liquids
Topic 19 · Half-life from decay of 56.0mg to 1.75mg in 12 hours