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  1. Practice problem

    Beta decay changes identity without ejecting a nucleon →

    Beginner · Apply a principle. What is the proton number of the daughter nucleus?

  2. Practice problem

    Both NAND inputs are high →

    Beginner · Apply a principle. What is its output?

  3. Practice problem

    Build the refracted angle from wavefront timing →

    Intermediate · Connect concepts. What is sin of the refracted angle to the normal?

  4. Practice problem

    Calibrate what one division means →

    Beginner · Read graphs & measurements. What is its figure of merit in μA per division?

  5. Practice problem

    Can brighter light increase stopping potential? →

    Intermediate · Compare cases. What is the stopping-potential magnitude after the intensity is doubled?

  6. Practice problem

    Can velocity be zero while acceleration is not? →

    Beginner · Compare cases. At the instant the cart reverses direction, what is its acceleration?

  7. Practice problem

    Cancel only the opposing components →

    Intermediate · Connect concepts. Find the magnitude of the net gravitational field there.

  8. Practice problem

    Cancel the open-end correction →

    Intermediate · Read graphs & measurements. Find the speed of sound.

  9. Practice problem

    Change collision size and density →

    Intermediate · Compare cases. Find the ratio ℓB/ℓA of mean free paths.

  10. Practice problem

    Change the photon rate, not the cutoff →

    Intermediate · Compare cases. What is the ratio of the new to the old total emitted X-ray photon rate?

  11. Practice problem

    Changing medium does not rename the source frequency →

    Intermediate · Compare cases. What is its wavelength inside the material?

  12. Practice problem

    Check mesh algebra with source power →

    Advanced · Connect concepts. What is the total resistor heating power?

  13. Practice problem

    Check the force directions first →

    Intermediate · Connect concepts. Find the speed for undeflected motion.

  14. Practice problem

    Check the layer before the fraction →

    Advanced · Apply a principle. What height of the prism is above the upper free surface?

  15. Practice problem

    Check when a current loop looks like a dipole →

    Advanced · Compare cases. What is Bdipole/Bexact at this point?

  16. Practice problem

    Choose a current-limiting resistor →

    Intermediate · Find a missing quantity. Find the required series resistance.

  17. Practice problem

    Choose a physically available cell arrangement →

    Advanced · Compare cases. Which n gives the largest load current?

  18. Practice problem

    Choose efficiency instead of peak power →

    Intermediate · Find a missing quantity. What load resistance meets this efficiency?

  19. Practice problem

    Combine amplitudes with phase →

    Intermediate · Apply a principle. Find the amplitude of their sum.

  20. Practice problem

    Combine positive and negative power →

    Intermediate · Connect concepts. Find the effective focal length.