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  1. Practice problem

    A growing acceleration →

    Intermediate · Apply a principle. Find its velocity at t = 2 s.

  2. Practice problem

    A hatch responds to pressure difference →

    Beginner · Apply a principle. What is the magnitude of the resultant pressure force?

  3. Practice problem

    A height is not a tube length →

    Intermediate · Apply a principle. What length along the tube lies between its crossing of the reservoir level and the meniscus?

  4. Practice problem

    A horizontal launch from a ledge →

    Intermediate · Connect concepts. How far from the base does it land?

  5. Practice problem

    A hotter surface radiates much more →

    Intermediate · Compare cases. Find the ratio of its final emitted thermal power to its initial emitted power.

  6. Practice problem

    A large grating helps only where light reaches it →

    Advanced · Find a missing quantity. What minimum illuminated width is required under the ideal grating criterion?

  7. Practice problem

    A larger sphere falls through syrup →

    Intermediate · Compare cases. Find the ratio of the larger sphere’s terminal speed to the smaller one’s.

  8. Practice problem

    A launcher recoils →

    Intermediate · Apply a principle. Find the launcher velocity immediately after firing.

  9. Practice problem

    A long rod warms up →

    Intermediate · Apply a principle. Find its length increase.

  10. Practice problem

    A long route between equal potentials →

    Beginner · Compare cases. What is the total work done by the electrostatic field?

  11. Practice problem / FREE SAMPLE

    A loop is tilted in the field →

    Intermediate · Apply a principle. Project the field onto the area normal; the angle is not measured from the plane.

  12. Practice problem

    A mixture needs weighted capacities →

    Advanced · Compare cases. What is the mixture’s γ?

  13. Practice problem

    A moving rod can have voltage without a circuit. →

    Intermediate · Connect concepts. What is the potential difference between the upper and lower ends in magnitude, and which end is positive?

  14. Practice problem

    A moving source compresses wavefronts →

    Intermediate · Apply a principle. Find the heard frequency.

  15. Practice problem

    A negative charge moves to higher potential →

    Intermediate · Apply a principle. Find its electric potential-energy change.

  16. Practice problem

    A neutral pair can still require work to turn →

    Intermediate · Apply a principle. What work must an external agent supply?

  17. Practice problem

    A null reading fixes an unknown →

    Intermediate · Find a missing quantity. Find the lower-right resistance.

  18. Practice problem

    A partition cannot deliver piston work →

    Intermediate · Compare cases. How much more work by the gas does A deliver than B?

  19. Practice problem

    A phase label must be compared with the voltage →

    Intermediate · Read graphs & measurements. What average real power enters the load?

  20. Practice problem / FREE SAMPLE

    A pipe open at both ends →

    Intermediate · Apply a principle. The fundamental has displacement antinodes at both ends with half a wavelength inside the pipe.