1011 past contests
Topic 29 · Molecular motion in a solid at rest versus a moving solid (true/false)
Topic 19 · Mass remaining after a given number of half-lives
Topic 16 · Gauge pressure at a given depth in a tank
Topic 16 · Scope of pascal's principle: fluids, mixing, and floating objects (true/false)
Topic 4 · Net force, acceleration and direction of motion (true/false)
Topic 19 · Finding half-life from initial and final mass of a decaying radioisotope
Topic 10 · Applying boyle's law, charles's law and the combined gas law to find an unknown gas variable
Topic 61 · Natural frequency of a spring-mass oscillator
Topic 11 · Average torque from a change in angular momentum
Topic 42 · Time constant of a series rl circuit
Topic 54 · Voltage across a resistor in a series-parallel network (voltage divider)
Topic 10 · Internal energy of an ideal gas depends only on temperature, not pressure or volume (true/false)
Topic 34 · Riddle: elastic collision, characterized by conservation of kinetic energy
Topic 5 · Electrostatic induction: a charged rod near a positively charged electroscope's cap (true/false)
Topic 34 · Problem of the day: momentum, net force and impulse from a velocity function
Topic 33 · Heat required for a phase change from mass and specific latent heat
Topic 44 · Riddle: the henry, si unit of inductance
Topic 3 · Kinetic energy of a moving object