1011 past contests
Topic 12 · Mass of an object from its density and volume
Topic 38 · Resultant speed of a boat crossing a current, from perpendicular velocity components
Topic 33 · Heat capacity and specific heat: q = c x delta-t
Topic 19 · Finding half-life from initial and final mass of a decaying radioisotope
Topic 60 · Equivalent resistance of two resistors in parallel, in series with a third
Topic 3 · Kinetic energy of a moving object
Topic 38 · Magnitude of the resultant of several vector forces
Topic 42 · Time constant of a series cr (resistor-capacitor) circuit
Topic 10 · Riddle: the isobaric thermodynamic process
Topic 3 · Kinetic energy has no direction, even for a projectile's velocity components (true/false)
Topic 2 · Orbital motion at perihelion: distance, speed and direction (true/false)
Topic 12 · Si unit of a constant in a given physical formula, from dimensional consistency
Topic 3 · Change in kinetic energy from the work-energy theorem
Topic 13 · Maximum power a variable resistor can draw from a battery with internal resistance
Topic 61 · Period, duration and angular frequency of a 1 khz simple harmonic oscillator (true/false)
Topic 19 · Time elapsed for a radionuclide sample to decay to a given mass, from its half-life
Topic 45 · Object distance for a given image-magnification on a convex mirror
Topic 61 · Length of a simple pendulum from period, frequency, or angular frequency