1011 past contests
Topic 5 · True or false: electric flux through a closed surface is proportional to enclosed charge
Topic 5 · True or false: no electric field lines can be present where charge density is zero
Topic 5 · True or false: electric field lines are parallel wherever charge density is zero
Topic 38 · Finding one component force from the resultant of two perpendicular forces
Topic 51 · Average speed of a trip with a stop and two different constant-speed legs
Topic 48 · Finding real depth from apparent depth using a refractive index found from a reference measurement
Topic 10 · Final volume of an isothermal gas process
Topic 11 · Torque about the origin from a force and position vector, $\boldsymbol{\tau} = \mathbf{r} \times \mathbf{F}$
Topic 11 · True or false: a couple forms when equal/opposite forces act at the same point
Topic 11 · True or false: a couple forms when equal/opposite forces lie along the same line
Topic 11 · True or false: net torque from equal/opposite forces at the same point is zero
Topic 20 · Beryllium-9 plus hydrogen forms lithium-6 and an alpha particle
Topic 59 · Problem of the day: resistance, current, power, and fuse rating of an immersion heater
Topic 56 · Internal resistance of an ideal voltmeter, ammeter and galvanometer (true/false)
Topic 34 · Finding mass from linear momentum and velocity, m=p/v
Topic 5 · Finding the charge from electric force and field strength, $F = Eq$
Topic 52 · Acceleration from a velocity change over a given displacement, v²=u²+2as
Topic 60 · Voltage across a parallel resistor network from current and equivalent resistance
Topic 36 · Normal force on an inclined plane, fn=mg cosθ
Topic 59 · Energy dissipated by a resistor, e=i²rt