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  1. Practice problem

    Measure the missing wetting angle →

    Intermediate · Find a missing quantity. What contact angle is consistent with this rise?

  2. Practice problem

    Momentum survives the collision. Does kinetic energy? →

    Advanced · Connect concepts. How much kinetic energy is lost in the collision?

  3. Practice problem

    Move the rotation axis →

    Intermediate · Apply a principle. Find its moment of inertia about the new axis.

  4. Practice problem

    Move within an empty conducting shell →

    Beginner · Compare cases. In the test-charge limit, what is the source potential at the centre?

  5. Practice problem

    Multiply the two optical stages →

    Intermediate · Connect concepts. Find the total angular magnification magnitude.

  6. Practice problem

    Multiply values from the same load state →

    Intermediate · Read graphs & measurements. What is the largest electrical power demonstrated by these sampled points?

  7. Practice problem / FREE SAMPLE

    One axis for the whole rotor →

    Advanced · Connect concepts. Inertia can be added only after every contribution refers to the same axis.

  8. Practice problem

    One graph, two travel measures →

    Intermediate · Read graphs & measurements. Find the total distance travelled.

  9. Practice problem

    One intensity does not identify which wave leads →

    Intermediate · Find a missing quantity. What is that phase lag?

  10. Practice problem

    Only part of the pull is horizontal →

    Intermediate · Apply a principle. Find its horizontal component.

  11. Practice problem

    Only the heating after contact creates stress →

    Advanced · Connect concepts. What is the final compressive stress magnitude?

  12. Practice problem

    Open terminals can hide an internal current →

    Advanced · Connect concepts. What is the common terminal voltage?

  13. Practice problem

    Opposite particle motion can add current →

    Intermediate · Connect concepts. What is the conventional current to the right?

  14. Practice problem

    Opposite velocities still make pressure →

    Intermediate · Connect concepts. What absolute pressure follows from the kinetic model?

  15. Practice problem

    Pay for newly created surface →

    Advanced · Connect concepts. What minimum increase in surface energy is required, expressed as a multiple of E₀?

  16. Practice problem

    Phase opposition is not the only interference case →

    Intermediate · Compare cases. What is the resultant displacement amplitude?

  17. Practice problem

    Potential near a positive charge →

    Intermediate · Apply a principle. Find the electric potential 0.30 m from it.

  18. Practice problem

    Power counts many photons →

    Intermediate · Connect concepts. Find the photon emission rate.

  19. Practice problem / FREE SAMPLE

    Power needed to raise the load →

    Intermediate · Apply a principle. At constant speed the useful work is the increase in gravitational potential energy.

  20. Practice problem

    Predict a load through an equivalent source →

    Advanced · Connect concepts. What power is dissipated in the load?