1011 past contests
Topic 14 · Absolute temperature ($277\text{ K}$) at which water's density is greatest
Topic 5 · Electric force on a negative charge from a given field vector
Topic 51 · Average speed for a two-leg trip (east then north) from total distance and time
Topic 46 · Riddle: the lensmaker's formula relating lens power to surface radii
Topic 6 · Particle velocity amplitude is $\omega A$, not $A$ (true/false)
Topic 6 · Identifying the standard form of a progressive sinusoidal wave (true/false)
Topic 64 · Wavelength is 2 pi over the wave number k, not k itself (true/false)
Topic 33 · Diatomic gases have higher molar heat capacity at constant volume than monatomic gases (true/false)
Topic 10 · Diatomic $C_v$ is not exactly twice monatomic $C_v$ (true/false)
Topic 10 · Diatomic $C_v$ exceeds monatomic $C_v$ due to extra degrees of freedom (true/false)
Topic 34 · Coefficient of restitution from drop and rebound heights
Topic 27 · Thermal efficiency of a heat engine from heat absorbed and rejected
Topic 5 · Net charge on a conducting sphere from its surface field and radius
Topic 42 · Impedance of a series lr circuit from angular frequency, inductance and resistance (three variants)
Topic 10 · Pressure of an isobaric process from volume change and work done
Topic 10 · Final volume of an isobaric process from initial volume, pressure and work done
Topic 10 · Work done by an ideal gas during isobaric expansion
Topic 8 · Kinetic energy of a subatomic-scale particle from its mass and speed
Topic 5 · Total charge induced on a conducting plane by a nearby point charge
Topic 26 · Number of photons per second from a co2 laser's power and wavelength