1011 past contests
Topic 14 · True or false: springs in parallel have the same tension
Topic 14 · True or false: springs in parallel undergo the same extension
Topic 21 · True or false: the first excited state energy is twice the ground state energy
Topic 21 · True or false: the hydrogen atom's ground state energy is negative
Topic 21 · True or false: the zero energy level corresponds to a free electron
Topic 5 · Electric force between two point charges via coulomb's law
Topic 51 · Average speed of a round trip including a rest stop and a differing return speed
Topic 14 · Extension of two springs in parallel under a load, $x = \dfrac{W}{k_1 + k_2}$
Topic 41 · Magnetic force on a moving charge, f=qvbsinθ, with larger q, v and b at 60°
Topic 50 · Evaluating a quadratic height-time function at a given time
Topic 41 · Magnetic force on a moving charge, f=qvbsinθ, at 45° to the field
Topic 50 · Velocity function of a projectile from the derivative of its height-time function
Topic 41 · Magnetic force on a moving charge, f=qvbsinθ, at 60° to the field
Topic 50 · Initial height of a projectile from its height-time function at t=0
Topic 10 · Volume of a given amount of gas at a stated temperature and pressure
Topic 8 · Ordering common lasers by increasing emission wavelength
Topic 41 · Magnetic flux density near a wire doubles when the distance from it is halved
Topic 19 · Activity of a radionuclide after elapsed time, via the exponential decay law
Topic 50 · Horizontal range of a horizontally-launched projectile from a tower, via time of fall
Topic 42 · Current in a shorted lr circuit after a given multiple of the time constant has elapsed