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  1. Practice problem

    Where does the spare current go? →

    Intermediate · Connect concepts. Find the Zener current.

  2. Practice problem

    Where is the balance point? →

    Intermediate · Apply a principle. Find the centre-of-mass coordinate.

  3. Practice problem

    Where should the lighter mass sit? →

    Intermediate · Find a missing quantity. Find the right mass distance from the pivot.

  4. Practice problem

    Which angle separates refraction from total reflection? →

    Intermediate · Find a missing quantity. What is the critical angle, measured from the normal inside the medium?

  5. Practice problem

    Which capacitor gets the larger voltage? →

    Intermediate · Connect concepts. After charging, what is the voltage magnitude across the 3 μF capacitor?

  6. Practice problem

    Which component turns the arm? →

    Intermediate · Apply a principle. Find the z component of torque about the pivot.

  7. Practice problem

    Which energy belongs to the emitted photon? →

    Intermediate · Connect concepts. What energy does the emitted photon have?

  8. Practice problem

    Which frequency maximizes displacement? →

    Advanced · Compare cases. At what angular frequency is the displacement amplitude largest?

  9. Practice problem

    Which measurement is relatively tighter? →

    Beginner · Compare cases. Find the ratio of A’s relative bound to B’s relative bound.

  10. Practice problem

    Which rolling object reaches the greater speed? →

    Advanced · Compare cases. What is the ratio of the cylinder’s final centre-of-mass speed to the hoop’s?

  11. Practice problem

    Which source receives the energy? →

    Intermediate · Connect concepts. At what rate does the 8 V source absorb energy?

  12. Practice problem

    Which uncertainty rule applies? →

    Intermediate · Read graphs & measurements. Find the approximate worst-case fractional uncertainty in R.

  13. Practice problem

    Which way does energy cross the boundary? →

    Beginner · Apply a principle. What is the change in the gas’s internal energy?

  14. Practice problem

    Why does pulling inward increase rotational energy? →

    Intermediate · Compare cases. What is the ratio of final to initial rotational kinetic energy?

  15. Practice problem

    Why isn’t the average speed simply five? →

    Beginner · Compare cases. What is the average speed for the whole trip?

  16. Practice problem

    Width of the broad central band →

    Intermediate · Apply a principle. Find the approximate width between the first minima on opposite sides.

  17. Practice problem

    Work done while turning →

    Intermediate · Connect concepts. Find its final rotational kinetic energy.

  18. Practice problem

    Work under a horizontal p–V line →

    Intermediate · Apply a principle. Find the work done by the gas.

  19. Practice problem

    Zero flux can still mean current →

    Intermediate · Apply a principle. At t=3.0 s, what is the signed current? Counterclockwise viewed from +z is positive.

  20. Practice problem

    Zero here does not mean zero everywhere →

    Advanced · Connect concepts. What is the resulting signed total magnetic moment along z?