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  1. Practice problem

    Use the stated reference resistance →

    Intermediate · Read graphs & measurements. Find α20.

  2. Practice problem

    Use the whole heat-capacity curve →

    Advanced · Apply a principle. How much heat is required?

  3. Practice problem

    Voltage that stops the fastest electrons →

    Intermediate · Apply a principle. Find the stopping-potential magnitude.

  4. Practice problem

    Walk down each column to one common level →

    Intermediate · Apply a principle. What is the gauge pressure pg − pa?

  5. Practice problem

    Weight the speed by area →

    Intermediate · Apply a principle. What is the volume flow rate?

  6. Practice problem

    Weights locate the gravity resultant →

    Intermediate · Compare cases. Where must one upward support force act to balance both force and torque?

  7. Practice problem

    What changes when gravity becomes weaker? →

    Beginner · Compare cases. What is its new period?

  8. Practice problem

    What does four times the accelerating voltage do? →

    Intermediate · Compare cases. What is the ratio of the second de Broglie wavelength to the first?

  9. Practice problem / FREE SAMPLE

    What happens at the highest point? →

    Beginner · Compare cases. The ball stops rising. It doesn’t stop moving.

  10. Practice problem

    What happens when the pipe narrows? →

    Beginner · Apply a principle. What is the mean speed at the narrower section?

  11. Practice problem

    What is the net force on a submerged block? →

    Beginner · Connect concepts. What is the net force immediately after release?

  12. Practice problem

    What speed keeps the string taut at the top? →

    Advanced · Connect concepts. What is the minimum speed at the bottom for a complete circle with the string just taut at the top?

  13. Practice problem

    What units belong to a restoring coefficient? →

    Intermediate · Apply a principle. What force acts at x = 0.50 m?

  14. Practice problem

    When a large zero uncertainty cancels →

    Advanced · Apply a principle. What is the combined standard uncertainty of the endpoint separation?

  15. Practice problem / FREE SAMPLE

    When do the two carts meet? →

    Beginner · Apply a principle. Opposite motions shrink the gap at the sum of their speed magnitudes.

  16. Practice problem

    When more readings reach a limit →

    Advanced · Read graphs & measurements. Find the combined standard uncertainty of the mean.

  17. Practice problem

    Where did the kinetic energy go? →

    Intermediate · Connect concepts. Find the increase in thermal energy from friction.

  18. Practice problem

    Where do the fields cancel? →

    Advanced · Find a missing quantity. Find the distance from +9q to the zero-field point between them.

  19. Practice problem

    Where does the battery energy go? →

    Advanced · Connect concepts. Find the total energy dissipated in the resistor.

  20. Practice problem

    Where does the cart’s kinetic energy go? →

    Intermediate · Connect concepts. What is the maximum compression of the spring?